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Thread: 3 Phase Electrical
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03-02-2011, 09:07 AM #1
3 Phase Electrical
I did a quick walk through of a commercial building that someone may or may not want inspected just to get an idea of what is there and it's layout. I included a picture of where the 3 phase electrical enters the building (through the roof). I am not real familiar with 3 phase. Can someone tell me a little bit about what these devices are and there function that the conductors are installed through? I believe the double up the conductors for like a 400 amp service as opposed to using a larger gauge conductor explaining why there are 8 total conductors rather than four.
The panel shown in the image is between the main service panel (exterior) and the breaker distribution panels (interior).
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03-02-2011, 01:07 PM #2
Re: 3 Phase Electrical
It looks like an unused CT cabinet that was once used to meter the power used in the building. I say unused because I don't believe there are any signal wires leaving the current transformers.
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03-02-2011, 07:33 PM #3
Re: 3 Phase Electrical
I bet your right. Would that have been common in the 60's? Thanks!
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03-02-2011, 07:39 PM #4
Re: 3 Phase Electrical
It is still a legitimate method to meter three-phase power.
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03-04-2011, 07:11 AM #5
Re: 3 Phase Electrical
It is still a legitimate method to meter single phase power as well on commercial properties utilizing single phase power.
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03-04-2011, 07:38 AM #6
Re: 3 Phase Electrical
With single phase you can go up to 400 amp without using CT's but we were talking 3-phase so I focused on that in this discussion.
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03-04-2011, 07:41 AM #7
Re: 3 Phase Electrical
There is a regular electric meter on the exterior main service panel... my guess would be it was discontinued or changed with an addition to the building or upgrade of the service...
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03-05-2011, 08:39 PM #8
Re: 3 Phase Electrical
May have been used for monitoring: for load shedding, for a particular time/watts reading, for an inter-phase device that would shut down motor(s) if and when it detected single-phasing i.e. loss of a phase, for recording of phase balance. I doubt it was ever utilized to meter by/for a utility co.
May have been to decipher who, if two different occupants/suites, was using what power from a single metered service.
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