So we're temporarily hooking up a dedicated piece of equipment that pulls 60 A. the cord is rated for 60 A but we're hooking it up to 150 amp breaker, that doesn't sound right but my boss says go ahead and do it. What does the code say about this? Thank you for your help.
4 awg SO cord hook up to 150 amp three phase 480V. breaker
- Thread starter zappy
- Start date
- Status
- Occupation
- Licensed Electrician
240.4 says that conductors shall be protected at their ampacity, but there are exceptions. Motors, air conditioners, welders are common ones, also tap conductors. If there is some kind of protection on the machine I might not be too worried about it.
petersonra
Senior Member
- Location
- Northern illinois
- Occupation
- engineer
Its temporary and your boss ordered you to do it. Presumably he knows better.
- Occupation
- Licensed Electrician
I didn't see a question about obeying the boss.
petersonra
Senior Member
- Location
- Northern illinois
- Occupation
- engineer
Note part where I said: Presumably he knows better.
If the code could talk it would say ,,,, "Use me to settle any doubts you may have".
JAP>
petersonra
Senior Member
- Location
- Northern illinois
- Occupation
- engineer
if you want to know what the code says about it look in article 590.
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
- Location
- Wisconsin
- Occupation
- PE (Retired) - Power Systems
It is unlikely the lugs on the breaker are rated for the fine stranding of a cord's conductor.
- Occupation
- Licensed Electrician
Maybe he does, maybe he doesn't. The question was, "What does the code say about it?"
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