Results 131 to 195 of 266

08082013, 08:46 AM #131
Re: Determining the amperage mat a main disconnect fuse block
Grounded or ungrounded it doesn't matter answer still the same. If these two transformers were wound as drawn there is no difference between them. You need to understand basic transformer theory. Since Jim and Robert don't, how can they understand the circuit and math? Smoke (lots of smoke) with a trace of bad math and mirrors = wrong answer.. If what you say is so then you could prove it in the lab. and you would find that one was a +60 amps and the other (at the same instant) would be a 60 amps. Besides circuit #1 is not the circuit we are talking about. Just more confusion from a couple of politicians that are weak in math..
"Get correct views of life, and learn to see the world in its true light. It will enable you to live pleasantly, to do good, and, when summoned away, to leave without regret. " Robert E. Lee

08082013, 09:09 AM #132
Re: Determining the amperage mat a main disconnect fuse block
Circuit 1 is exactly the situation that was described when the capacity of the panel was described at 120 volts. It was also stated that the capacity was 60 amps at 240 volts.
Stop deflecting and answer the questions. This has never been about transformers.

08082013, 09:35 AM #133
Re: Determining the amperage mat a main disconnect fuse block
I understand what you are saying Roland but + and  amps might just be a bit of a misnomer. Current flows in a direction due to + and  potentials. What is important is that if you push one electron in one end of a wire you only get one out the other end of the wire, not two.
The beatings will continue until morale has improved. mgt.

08082013, 09:51 AM #134
Re: Determining the amperage mat a main disconnect fuse block
It is all about which way the electrons are flowing at any instant in an AC circuit. DC is a little more straight forward.
Sorry Jim and Robert you are using oranges to prove an apple theory and you have failed at a very basic level.. 5th grade math. Catch you on the next one if you don't overload in theory
"Get correct views of life, and learn to see the world in its true light. It will enable you to live pleasantly, to do good, and, when summoned away, to leave without regret. " Robert E. Lee

08082013, 10:13 AM #135
Re: Determining the amperage mat a main disconnect fuse block
All answers based on unamended National Electrical codes.

08082013, 12:32 PM #136
Re: Determining the amperage mat a main disconnect fuse block
Apparently you think the tail should wag the dog. I have nothing to prove. The math and science of electricity is all that is needed to prove my position.. I have posted enough information that anyone of average intelligence can work through it and come to the same conclusion I have posted. They couldn't do the same for your position. So you can continue you struggles with the math and science of electricity alone....some nuts are too tough to crack
"Get correct views of life, and learn to see the world in its true light. It will enable you to live pleasantly, to do good, and, when summoned away, to leave without regret. " Robert E. Lee

08082013, 01:42 PM #137
Re: Determining the amperage mat a main disconnect fuse block
It is just a shame the wrong conclusion would be reached. Vern even drew the diagram showing the 2 legs carrying 60 amps at 120 volts and some still don't see it.
Why will you not answer Robert's question? How hard is it to add 20 + 20?
All answers based on unamended National Electrical codes.

08082013, 03:40 PM #138
Re: Determining the amperage mat a main disconnect fuse block
It is just a shame that homeowners will have to pay to have erroneous information like this refuted simply because of a lack of understanding of the subject matter on the part of the inspector.
All answers based on unamended National Electrical codes.

08082013, 04:09 PM #139
Re: Determining the amperage mat a main disconnect fuse block
The beatings will continue until morale has improved. mgt.

08082013, 04:16 PM #140
Re: Determining the amperage mat a main disconnect fuse block
Diagram 1 shows 2 independent 120 circuits. They cannot be the same 60 amps being measured. Just because the values are the same does not mean they are the same amps. Vern is wrong about that.
All answers based on unamended National Electrical codes.

08082013, 04:57 PM #141
Re: Determining the amperage mat a main disconnect fuse block
Oh hell ya!
It's 40 amps on the same leg, and if you were to add a 10 amp load on the other leg it would still be 40 amps. If you were to look at the series of diagrams I posted (Fig 1 through Fig 5), and were to be able to comprehend, you would see how this is. Please feel free to make the arrows double ended (pointing both directions) to satisfy your distaste for a single point in time (DC representation). And yes I do know that I left out a load by mistake and drew an extra wire that would cause a short, but if you can't fix that you should not get anywhere near electricity!
The beatings will continue until morale has improved. mgt.

08082013, 05:58 PM #142
Re: Determining the amperage mat a main disconnect fuse block
You are still mixing AMPS AND POWER. We are talking AMPS and have been since the time it was stated that you could have 120 amps on a 3wire 60 amp circuit. Ten of the same 40 amps that is on the first leg now goes through the second leg. The other 30 amps still returns through the neutral. Again if you want to talk amps, lets talk amps. If you want to talk power, lets talk power.
The beatings will continue until morale has improved. mgt.

08082013, 06:09 PM #143
Re: Determining the amperage mat a main disconnect fuse block
No, you would have a panel with a 50 amp load, 40 on one leg plus 10 on other other. The neutral load would be 30 amps. The current is not crossing to the other hot as they are 120 volt and the return is on the grounded conductor, not the other hot leg.

08082013, 06:46 PM #144
Re: Determining the amperage mat a main disconnect fuse block
The beatings will continue until morale has improved. mgt.

08082013, 07:01 PM #145
Re: Determining the amperage mat a main disconnect fuse block
Do you really need someone to tell you that running equipment from a panel places a load on it? Amps are a measure of the load. A demand load calculation for a service gives you the expected load in amps.
The current got there by the equipment being used. If it were turned off there would be no load.
Go ahead and sit out. Robert and myself are sure of our answers and have given numerous examples to prove ourselves correct.
All answers based on unamended National Electrical codes.

08082013, 07:23 PM #146
Re: Determining the amperage mat a main disconnect fuse block
The beatings will continue until morale has improved. mgt.

08092013, 09:12 AM #147
Re: Determining the amperage mat a main disconnect fuse block
The math and science of electricity is all that is needed to prove my position.. I have posted enough information that anyone of average intelligence can work through it and come to the same conclusion I have posted. They couldn't do the same for your position. So you can continue you struggles with the math and science of electricity alone.
Electricity is exactly predictable with math. Once the math is done you could build the circuit in a lab and measures every value (and verify) you calculated. You couldn't do that with your fuzzy math problem..
"Get correct views of life, and learn to see the world in its true light. It will enable you to live pleasantly, to do good, and, when summoned away, to leave without regret. " Robert E. Lee

08092013, 09:22 AM #148
Re: Determining the amperage mat a main disconnect fuse block
What the circuit will support is right on the breaker handle or fuse label. Why you and Vern will not believe this is beyond me.
I see that you are still not sure enough of your position to ask the same question on and electrical foruma and post a link here so others can see the correct answer.
You said the math is easy to prove and it is. Watch this: 60 amps x 120 volts = 7200 watts, 7200 x 2 for the number of legs in the panel = 14400 watts.
60 amps x 240 volts = 14400 watts.
Look they match.
Last edited by Jim Port; 08092013 at 09:33 AM.
All answers based on unamended National Electrical codes.

08092013, 09:51 AM #149
Re: Determining the amperage mat a main disconnect fuse block
There is not a single point in either circuit that will see more than 60 amps. In fact the second circuit would work without the grounded (center) conductor..
   Updated   
Here's the correct math
math.JPG
You are still mixing apples and oranges. you are taking a 240 volt calculation and using 120 volts to prove you point.
   Updated   
I don't need to check with anyone.. I just use math and science. You use smoke and mirrors..
"Get correct views of life, and learn to see the world in its true light. It will enable you to live pleasantly, to do good, and, when summoned away, to leave without regret. " Robert E. Lee

08092013, 10:00 AM #150
Re: Determining the amperage mat a main disconnect fuse block
"Get correct views of life, and learn to see the world in its true light. It will enable you to live pleasantly, to do good, and, when summoned away, to leave without regret. " Robert E. Lee

08092013, 11:03 AM #151
Re: Determining the amperage mat a main disconnect fuse block
My position has NEVER changed. I have said since the beginning of this thread that the panel in question can support 120 amps at 120 volts or 60 amps at 240 volt. Go back and check.
Again you confused how many legs in the panel there are. Myself and several others have tried to point out your confusion and math errors. I see that you are going to continue to twist this however you want instead of admitting your blindness.
Good Day.
All answers based on unamended National Electrical codes.

08092013, 11:12 AM #152
Re: Determining the amperage mat a main disconnect fuse block
Thanks for saying you agreed with me from the very beginning. If you would drop the 120 amp thing you would get a passing grade. I am sorry I am still laughing... oh you have tried to confuse amps and watts, 240 volt calculations with 120 volt calculations and you are still loosing. Do you still have that roofers card? I hear it covers everything and what you are sitting on badly needs covered.
Math teaches a life skill called adaptive reasoning. Something you apparently don't have.
"Get correct views of life, and learn to see the world in its true light. It will enable you to live pleasantly, to do good, and, when summoned away, to leave without regret. " Robert E. Lee

08092013, 11:50 AM #153
Re: Determining the amperage mat a main disconnect fuse block
I do not agree with you, you simply do not understand that there are TWO INDEPEDENT legs in the panel, EACH capable of allowing 60 amps to flow. Even if you were to remove one fuse you could still pull 60 amps from the other leg. The two 120 volt legs are the key to understanding this, not some extraneous number.
BTW, every time you post Diagram 1, you reinforce my position.
All answers based on unamended National Electrical codes.

08092013, 12:12 PM #154
Re: Determining the amperage mat a main disconnect fuse block
Thanks for dropping the 120 amp stuff(you couldn't prove it anyway) and agreeing with me again. You are up to a D, barely.
You don't seem to understand what this discussion has been all about120/240 volt, single phase service with a 2pole 60 amp breaker (close to diagram #2). Or do you even know what three elements are required to make up a circuit?
I know I should have stopped when my BS meter needle pegged and was bent, but when you accused me (and Vern) of costing some poor home owner money because we were spreading misinformation, I guess you raised my hackles. When in fact you and Robert are the ones doing this. What office are you guys running for? Are you Jerry's and HG's apprentices?
My suggestion for you two is to stick to topics you have some correct knowledge of and leave the rest to someone else.
Read my signatureand live it. You won't run into so many rocks
"Get correct views of life, and learn to see the world in its true light. It will enable you to live pleasantly, to do good, and, when summoned away, to leave without regret. " Robert E. Lee

08092013, 12:22 PM #155
Re: Determining the amperage mat a main disconnect fuse block
Since you seem to like oranges. Suppose you have an orange juice factory with one machine that can produce 10 gallons of OJ per hour. You have plenty of extra oranges and enough floor space to add a second identical machine. How many gallons of OJ can you produce using both machines for one hour? I bet your answer is 10 gallons.
All answers based on unamended National Electrical codes.

08092013, 12:32 PM #156
Re: Determining the amperage mat a main disconnect fuse block
“You are not entitled to your opinion. You are entitled to your informed opinion. No one is entitled to be ignorant.”
― Harlan Ellison
You seem to take entitlement very seriously
"Get correct views of life, and learn to see the world in its true light. It will enable you to live pleasantly, to do good, and, when summoned away, to leave without regret. " Robert E. Lee

08092013, 12:38 PM #157
Re: Determining the amperage mat a main disconnect fuse block
No, I feel that the truth and facts need to be told. I am kind of like the kid that told the emporer that he wasn't wearing any clothes. The truth doesn't change.
Thank you for this thread. I will use it as an example of what happens during so many home inpsection reports and why the "defects and issues" are so easy to refute. Thankfully all HI's are not so lacking.
BTW, the question posted in #122 remains unanswered. Quite a stumper wasn't it?
All answers based on unamended National Electrical codes.

08092013, 02:05 PM #158
Re: Determining the amperage mat a main disconnect fuse block
You are more then welcome. Make sure they get the whole thread to read because anyone with average intelligence and a 5th grade education will figure out you are wrong. Although they will need a Phd in Bull Crap to figure out how you got it so wrong.
   Updated   
Both you guys are arguing with math and science. Hows it going? I am just pointing out the facts. One of which is it is you that are doing a disservice by spreading misinformation.
I was once told by a very wise manIt is better to be thought of as a fool then to open one's mouth and remove all doubt like you two have...
"Get correct views of life, and learn to see the world in its true light. It will enable you to live pleasantly, to do good, and, when summoned away, to leave without regret. " Robert E. Lee

08092013, 02:29 PM #159
Re: Determining the amperage at a main disconnect fuse block
And once again you ignored a another direct question asked of you. How much OJ can you get from the 2 machines? Can you get twice the water out of the two hoses attached to Hoover Dam as you would with just one?
You are arguing against the math facts as presented. You don't understand them so you think they are wrong despite numerous explanations and analogies to help you understand.
Last edited by Jim Port; 08092013 at 02:34 PM.
All answers based on unamended National Electrical codes.

08092013, 04:15 PM #160
Re: Determining the amperage at a main disconnect fuse block
Jim, take diagram or circuit #1 that you are so proud of and complete each side by connecting a load to each. You do know that no circuit will work unless it is a closed loop, right! Now counting the number of amps. With your method there are 240 amps (ya got to count each leg of each circuit with your method) Wow! now we have 240 amps. If we keep this up we can put Duke Power out of business in no time. Now because we can see this will not work, lets try circuit #2 . Put a load on between the neutral and one of the legs that draws 60 amps. Now all 60 amps obviously is gong through the neutral. That's ok, all is good, but do we have 60 amps or 120 amps? (Oh I do hope you said 60 amps) Now put a load across the other leg to neutral that draws 60 amps. Does any of the current flow through the neutral? No! So where does it go? It goes through the other leg. Should we measure it again? It didn't sound like a good idea for circuit #1 did it? No one has said you could get 240 amps so why would we now say we can get 120 amps?
The beatings will continue until morale has improved. mgt.

08092013, 05:02 PM #161
Re: Determining the amperage mat a main disconnect fuse block
Keep trying Vern, wrong on both counts. You still have 60 amps on each ungrounded conductor. Each ungrounded conductor in the 120 volt branch circuit is also carrying the 60 amp return current. You do not count this towards the panel capacity. In the 240 example there would be no current on the system neutral if both legs are balanced. Also the current on the neutral has nothing to do with the capacity of the fuse or breaker in this example. The OP asked how much could the 2 pole 60 amp fused pullout supply.
No one has said anything about having 240 amps because you do not. The fuse or breaker would have opened at 60 amps and you do not count system neutral current unless sizing a service or feeder. Your attempts to disprove myself and Robert and the others gets more ridiculous each time.
It is a shame that two independent 120 volt 2 wire circuit has you so confused. Maybe you can answer the question in Post #122? How much current is needed to trip a 20 amp branch circuit?
All answers based on unamended National Electrical codes.

08092013, 05:31 PM #162

08092013, 05:47 PM #163
Re: Determining the amperage mat a main disconnect fuse block
Just another comment taken out of context. Let me spell it out for you. I will type slowly.
How two people can ignore how much current a fuse or breaker will allow before opening after numerous and different explanations defies logic. It is clearly labeled. I tried to give you the benefit of the doubt, but I see that was wasted.
Simple questions have been asked like how much current will a 20 amp breaker pass, how much will two pass and the answers, if given, are about the neutral or transformer winding or some other extraneous BS not germane to the original question.
Both your and Roland's attempts to prove the world to be flat again have failed.
All answers based on unamended National Electrical codes.

08092013, 06:47 PM #164
Re: Determining the amperage mat a main disconnect fuse block
You have never answered this from post #9.
I guess you will have to show me where you could measure 120 amps on a 3wire, 120/240, single phase transformer with the 120 volt phase/circuit each pulling 60 amps???
And don't get confused about the transformer thing. We all know it is way over your heads. This is the circuit under discussion, ie. apples..
In fact there are numerous questions Jim and Robert have failed to answer. They would all show their logic is screwy...
"Get correct views of life, and learn to see the world in its true light. It will enable you to live pleasantly, to do good, and, when summoned away, to leave without regret. " Robert E. Lee

08092013, 09:47 PM #165
Re: Determining the amperage mat a main disconnect fuse block
Kirchhoff's First Rule (Junction Rule) is based on the conservation of charge. It states that:
“At any junction point, the sum of all currents entering the junction must equal the sum of all currents leaving the junction.”
This means that when current reaches the branches in a circuit, it will split up and take different routes. When the branches come back together, the currents will add back together too.
The beatings will continue until morale has improved. mgt.

08102013, 04:02 AM #166

08102013, 04:05 AM #167

08102013, 04:36 AM #168
Re: Determining the amperage mat a main disconnect fuse block
Again you show your lack of understanding of the topic that has been debated for well over 100 posts. This has NOTHING to do with transformers, combining currents or anything else. Clear your mind of your preconceptions and read what is written. The statement was made by myself and others that the panel could SUPPLY 120 amps at 120 volts. You and your friend do not understand the basis of this statement and I do not think you ever will. You were given a chance to have your theory proven on a professional electrical forum but did not avail yourself of that opportunity, but as Robert said, you did avoid the embarrassment.
All answers based on unamended National Electrical codes.

08102013, 04:57 AM #169
Re: Determining the amperage mat a main disconnect fuse block
THis was never the original question. You and Robert introduced this series of unrelated questions (oranges) to prove your ignorant answer. I will keep bringing you back to the original question which you have never answered. 120/240 volt, single phase AC source(can't use transformer cause it scares them) with 2pole 60 amp breaker with a 60 amps on each phase..
It's simple addition why can't you solve it? Use Kirchhoff's circuit laws. They are simple addition also.
"Get correct views of life, and learn to see the world in its true light. It will enable you to live pleasantly, to do good, and, when summoned away, to leave without regret. " Robert E. Lee

08102013, 05:15 AM #170
Re: Determining the amperage mat a main disconnect fuse block
I simply corrected your post where you said,
From Post #5.
I then corrected you by saying this in Post #8
From Post #4;
Since that point you have failed to understand. We have simply corrected your error.
All answers based on unamended National Electrical codes.

08102013, 05:18 AM #171
Re: Determining the amperage mat a main disconnect fuse block
The beatings will continue until morale has improved. mgt.

08102013, 05:33 AM #172
Re: Determining the amperage mat a main disconnect fuse block
You obviously do not want to understand this simple subject. Hopefully your eyes will open one day.
All answers based on unamended National Electrical codes.

08102013, 05:49 AM #173
Re: Determining the amperage mat a main disconnect fuse block
This is not about the current on the neutral.
I will ask you a straight forward question. How much current does it take to open a 60 amp fuse or breaker? Does this matter whether the breaker is a single or double pole? If BOTH legs of the double pole breaker opened due to overload, how much current was flowing?
All answers based on unamended National Electrical codes.

08102013, 06:41 AM #174
Re: Determining the amperage mat a main disconnect fuse block
The source of all the contention was started in Post #9.
This is also where the transformer sidetrack came from.
No one ever said you could measure 120 amps on ONE conductor. It was said that there was 120 amps of capacity available.
All answers based on unamended National Electrical codes.

08102013, 09:36 AM #175
Re: Determining the amperage mat a main disconnect fuse block
Originally Posted by Jim Port
"Fixed this for you. At 120 volts you still only have 60 amps available per leg."
You do see 60 amps on each leg, but they are the same 60 amps as we have been saying since the beginning! NOT PER!
You asked for and authority to settle this, I thought Kirchhoff would be enough for even you!
The beatings will continue until morale has improved. mgt.

08102013, 10:07 AM #176
Re: Determining the amperage mat a main disconnect fuse block
Robert, I hope you don't expect an answer for your latest question. The question you posted days ago still has not been answered.
Vern, how do you explain the that half the panel will still function properly even with one fuse removed? How much capacity does that half have?
All answers based on unamended National Electrical codes.

08102013, 10:10 AM #177
Re: Determining the amperage mat a main disconnect fuse block
The laws of physics does not apply to you, very interesting!
You are talking power again, you know I have already asked you to talk power OR current.
I am going to do some vector analysis. CE (center of effort) plotted against CLR (center of lateral resistance, to find DMG (distance made good).....I m going sailing.
The beatings will continue until morale has improved. mgt.

08102013, 11:08 AM #178
Re: Determining the amperage mat a main disconnect fuse block
All answers based on unamended National Electrical codes.

08102013, 01:47 PM #179
Re: Determining the amperage mat a main disconnect fuse block
I have followed this thread very closely and have found very educational....and confusing .
My question is for Jim & Robert to help me, and probably others, understand the argument. Are you saying that a 120 amp balanced load would not trip the 60 amp OCPD?
I apologize in advance if this is a stupid question.

08102013, 02:07 PM #180
Re: Determining the amperage mat a main disconnect fuse block
Not a stupid question. It appears you understand this better than others.
There are 2 ungrounded legs in a typical home panel that feed alternating fingers on the bus bars. Using a balanced 120 amp 120 volt load across the 2 legs would have each leg carrying 1/2 the current or 60 amps. This could be as simple as three fully loaded 20 amp 120 volt circuits operating on each leg of the panel.
If the load were 240 volts the breaker or fuse will open when the current exceeds 60 amps.The breaker or fuse would open when either or both sides saw more than 60 amps. In an extremely unbalanced load where everything was on one leg and exceeded 60 amps the breaker would open even with the other leg carrying 0 amps.
The key factor that has been ignored numerous times is that the number of amps will change with the voltage. For example 600 watts at 120 volts = 5 amps, change the voltage to 240 volts and the amps drop to 2.5. Using a higher voltage allows for smaller wire sizes to be used.
Last edited by Jim Port; 08102013 at 02:16 PM.
All answers based on unamended National Electrical codes.

08102013, 03:12 PM #181
Re: Determining the amperage mat a main disconnect fuse block
Still mixing power and current huh!
In practical terms, the ampere is a measure of the amount of electric charge passing a point in an electric circuit per unit time with 6.241 × 10^{18}electrons, or one coulombper second constituting one ampere.
59 amps will pass through a 60 amp breaker just fine. It does not matter if it is being pushed by 1 volt or 10,000 volts it will not trip. When it reaches 60 amps it will trip. Voltage is irrelevant. Tripping of a breaker or blowing of a fuse is due to power developed across the OCP device. All conductors have resistance and the power is the product of current squared times resistance. Resistance and current are the only two things a fuse knows. The voltage ratting on a fuse or circuit breaker is the voltage that the blown fuse will not arc across after it has blown.
This discussion has been about amps from the beginning, even though Jim & Robert keep asking questions regarding or insisting that power calculations be used.
There will never be more than 60 amps at one time on a 3wire circuit protected by 60 amp breakers and I don't care if there are 100 breakers or fuses in the circuit.
Last edited by Vern Heiler; 08102013 at 03:17 PM. Reason: reft and light mixed up
The beatings will continue until morale has improved. mgt.

08102013, 03:26 PM #182
Re: Determining the amperage mat a main disconnect fuse block
Voltage is not irrelevant. The voltage something operates at determines the amp draw as I illustrated above showing the 600 watt load and the difference in amps being halved by the doubling of the voltage.
BTW, you appear to have little or no knowledge of breaker trip curves or the UL allowance for variation. Depending on the rate of rise a breaker will hold 125% for over an hour. It does not trip as soon as it sees 60.1 amps.
All answers based on unamended National Electrical codes.

08102013, 03:56 PM #183
Re: Determining the amperage mat a main disconnect fuse block
Still can't see or admit that you are talking about power after I have posted the definition of current. And yes I do know about breaker ratings and the difference in a standard and slow blow fuse. Clouding the discussion with this or PF or current lag, would not help for anyone to understand the basics, and certainty didn't help you! Talk current or go home!
The beatings will continue until morale has improved. mgt.

08102013, 04:06 PM #184
Re: Determining the amperage mat a main disconnect fuse block
Post #4
"Those two guys are incorrect and you're right. The feeder is 60 amp @ 240 volts (or 208). At 120 volts you would have a capacity of 120 amps but that nothing to do with the rating of the feeder."
Post #10
"Think about it, you could try to pull 75 amps on one leg of the 2 pole breaker while the other leg is at 0. Depending on the trip curve, the breaker will trip. You could also have each of the 2 hots pulling 60 amps and the breaker does not trip. 60 + 60=120."
Last edited by Vern Heiler; 08112013 at 01:04 PM. Reason: and post 10
The beatings will continue until morale has improved. mgt.

08112013, 02:04 PM #185
Re: Determining the amperage mat a main disconnect fuse block
"Get correct views of life, and learn to see the world in its true light. It will enable you to live pleasantly, to do good, and, when summoned away, to leave without regret. " Robert E. Lee

08112013, 04:07 PM #186
Re: Determining the amperage mat a main disconnect fuse block
Sorry Roland, that diagram you posted was by Vern, not me.
It would not have to be a double pole in order to trip. The OP asked about a fused pullout disconnect. If there was more than 60 amps on one leg the fuse would still open. More than 60 amps on a double pole breaker would also cause the breaker to open.
All answers based on unamended National Electrical codes.

08112013, 04:17 PM #187
Re: Determining the amperage mat a main disconnect fuse block
"Get correct views of life, and learn to see the world in its true light. It will enable you to live pleasantly, to do good, and, when summoned away, to leave without regret. " Robert E. Lee

08112013, 05:25 PM #188
Re: Determining the amperage mat a main disconnect fuse block
The beatings will continue until morale has improved. mgt.

08122013, 04:39 AM #189
Re: Determining the amperage mat a main disconnect fuse block
I understand this issue quite well. Some just can't get past the fact that no one said you could measure the 120 amps on one conductor and that two conductors carrying 60 amps each equal 120 amps of capacity.
All answers based on unamended National Electrical codes.

08122013, 06:14 AM #190
Re: Determining the amperage mat a main disconnect fuse block
The beatings will continue until morale has improved. mgt.

08122013, 06:49 AM #191
Re: Determining the amperage mat a main disconnect fuse block
Some of you may be wondering what this discussion is all about. At times I wonder myself.
Jim and Robert are using a mix of amps and voltamps to try to prove that 120 amps of "loads or capacity" exists somewhere in the circuit under discussion(120/240 voltsingle phase), but admit they cannot measure it. This should raise a big question mark for all of you...
Here are two definitions of "load" from two major publication textbooks.(one of which I am a technical editor of).
"Loadthe power consumed by a piece of equipment or a circuit while performing its function."
"LoadThe current demand on the output of a circuit."
And a quote from one"There is a limit on the LOAD (current demand) that can be placed on any circuit, in many cases, this limit is indicated by the current rating of the circuit's fuse or circuit breaker."
The NEC uses a mix of amps and voltamps when defining "load". Why is this? During this calculation one would use the system voltage available where the load is being used. But when everything is put in voltamps you can take that total and use it with any of the NEC system voltages. It would be noted that the NEC typically only uses dual voltage systems, but 120 is available (a single phase). which already makes R&J's answer wrong. The total load in amps is always stated from the higher voltage's perspective. A 120/240 system would be stated in amps at 240 volts..Not at 120 volts. Why is thisbecause this load is what is used to size the service entrance conductors and stating the service size...So for example you could not have 520 amp 120 volt loads and claim 100 amps of total load on a 120/240 system(the one under discussion). In fact if the loads were balanced between the 2 phases, there would be 20 amps on the neutral with only 50 amps of total connected load (is it starting to look familiar?). The Voltamps would be the same for 120 or 240 (so you could find total load even at say 480 volts)..And lastly, you can build any electrical circuit in a lab and prove out your calculations by actual measurements (it is a science after all)..So be very cautious when someone tells you it exists but you can't actually measure it. This is the principle that lead to the banking mortgage collapse....ie. the money exists but you can't actually hold it in your hands..
quotes from Delmar's Standard Textbook of Electricity and Introduction to ElectricityPaynter & Boydell
It was pointed out to me that my example might be confusing. I kept it realworld so 5 20 amp circuit breakers or fuses. Three on A phase and two on B phase results in the loading I described. Certainly a completely balanced circuit would result in 0 amps on the neutral..
Last edited by Roland Miller; 08122013 at 01:03 PM.
"Get correct views of life, and learn to see the world in its true light. It will enable you to live pleasantly, to do good, and, when summoned away, to leave without regret. " Robert E. Lee

08122013, 07:37 AM #192
Re: Determining the amperage mat a main disconnect fuse block
Of course, the other issue here is the one of "self appointed experts" and who should you believe.
Jim, Robert, Jerry Peck, and HG all answer questions and promote them selves as "experts". The difference comes when someone disagrees with them. They then spin the question, redirect the issue, try to send you off to check with "someone that knows", accuse you of costing some innocent group money, say you can't even answer simple questions and are spreading misinformation. And call you a TROLL. And often they resort to insults and directly questioning whether you know anything about the subject. ..and add to thatThey have checked with their buddy's and they agree with them.
This sure sounds a lot like BULLYING to me!
"Get correct views of life, and learn to see the world in its true light. It will enable you to live pleasantly, to do good, and, when summoned away, to leave without regret. " Robert E. Lee

08122013, 02:51 PM #193
Re: Determining the amperage mat a main disconnect fuse block
You were right Robert, here we are over 200 posts and some still do not understand and are now blaming us for bullying them. If telling people the facts is bullying, so be it.
All answers based on unamended National Electrical codes.

08132013, 05:59 AM #194
Re: Determining the amperage mat a main disconnect fuse block
The beatings will continue until morale has improved. mgt.

08132013, 10:26 AM #195
Re: Determining the amperage mat a main disconnect fuse block
Of course, the other issue here is the one of "self appointed experts" and who should you believe.
Jim, Robert, Jerry Peck, and HG all answer questions and promote them selves as "experts". The difference comes when someone disagrees with them. They then spin the question, redirect the issue, try to send you off to check with "someone that knows", accuse you of costing some innocent group money, say you can't even answer simple questions and are spreading misinformation. And call you a TROLL. And often they resort to insults and directly questioning whether you know anything about the subject. ..and add to thatThey have checked with their buddy's and they agree with them.
This sure sounds a lot like BULLYING to me! yup
   Updated   
Some of you may be wondering what this discussion is all about. At times I wonder myself.
Jim and Robert are using a mix of amps and voltamps to try to prove that 120 amps of "loads or capacity" exists somewhere in the circuit under discussion(120/240 voltsingle phase), but admit they cannot measure it. This should raise a big question mark for all of you...
Here are two definitions of "load" from two major publication textbooks.(one of which I am a technical editor of).
"Loadthe power consumed by a piece of equipment or a circuit while performing its function."
"LoadThe current demand on the output of a circuit."
And a quote from one"There is a limit on the LOAD (current demand) that can be placed on any circuit, in many cases, this limit is indicated by the current rating of the circuit's fuse or circuit breaker."
The NEC uses a mix of amps and voltamps when defining "load". Why is this? During this calculation one would use the system voltage available where the load is being used. But when everything is put in voltamps you can take that total and use it with any of the NEC system voltages. It would be noted that the NEC typically only uses dual voltage systems, but 120 is available (a single phase). which already makes R&J's answer wrong. The total load in amps is always stated from the higher voltage's perspective. A 120/240 system would be stated in amps at 240 volts..Not at 120 volts. Why is thisbecause this load is what is used to size the service entrance conductors and stating the service size...So for example you could not have 520 amp 120 volt loads and claim 100 amps of total load on a 120/240 system(the one under discussion). In fact if the loads were balanced between the 2 phases, there would be 20 amps on the neutral with only 50 amps of total connected load (is it starting to look familiar?). The Voltamps would be the same for 120 or 240 (so you could find total load even at say 480 volts)..And lastly, you can build any electrical circuit in a lab and prove out your calculations by actual measurements (it is a science after all)..So be very cautious when someone tells you it exists but you can't actually measure it. This is the principle that lead to the banking mortgage collapse....ie. the money exists but you can't actually hold it in your hands..
quotes from Delmar's Standard Textbook of Electricity and Introduction to ElectricityPaynter & Boydell
It was pointed out to me that my example might be confusing. I kept it realworld so 5 20 amp circuit breakers or fuses. Three on A phase and two on B phase results in the loading I described. Certainly a completely balanced circuit would result in 0 amps on the neutral..
Good job Vern!!
"Get correct views of life, and learn to see the world in its true light. It will enable you to live pleasantly, to do good, and, when summoned away, to leave without regret. " Robert E. Lee
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