Results 1 to 4 of 4
07-26-2007, 03:57 PM #1
Last edited by Clay E White; 01-04-2008 at 01:47 PM.
07-26-2007, 04:20 PM #2
It does look like heat discoloration. Did you take a temp reading?
As for the cause, most likely a loose connection.
07-26-2007, 06:49 PM #3
Previous overheating - I wouldn't venture a guess as to what from, clients remember the strangest stuff - often not what you meant or said. You say it MAY be from a poor connection - they hear it IS from a poor connection.
Grounding is wrong, though not unusual.
Eric Barker, ACI
Lake Barrington, IL
07-28-2007, 09:26 AM #4
The discoloring may be from the original manufacture, or it just may be old, excess 'grease' that often comes on breaker contacts. Or, there may have been a breaker go bad in that spot. I don't really see any cause for concern.
While extreme heat will affect the 'spring temper' of any metal, the way panels are constructed make that a concern only for the breaker part of the connection, and has no effect on the busses.
As for the air conditioning disconnect, I do not see a problem with what was done. It's an older disconnect, which likely had no ground terminals. I'm glad the guy bonded the enclosure.
Two wires under the lug? While I don't like it, it may just possibly be legal; many such lugs are listed for as many as 3 ground wires under each screw.