You may do this, break one pole, for motor starting purposes only. Your required disconnecting means must open both line conductors.Can you use a one pole starter switch with one overload for a two pole motor or a 230 volt motor? This would protect one motor lead and is it that on single phase you only need to protect one motor lead?
NEC article 430 (can't remember the exact paragraph) has required overload protection in all ungrounded legs ever since around 1978. The old 3 phase starters with only 2 overload devices have been illegal* since then.
*Illegal is, I know, not the appropraite word, but I use it in the context of a code violation for new installations of course. There are no "Overload Police"... yet.
Me too. It sucks when you can remember things that are now considered history...A not so subtle reminder of my age. I installed bunches of 2 overload 3 phase starters in my life. 1978 ? really ? WOW!
NEC article 430 (can't remember the exact paragraph) has required overload protection in all ungrounded legs ever since around 1978. The old 3 phase starters with only 2 overload devices have been illegal* since then.
*Illegal is, I know, not the appropraite word, but I use it in the context of a code violation for new installations of course. There are no "Overload Police"... yet.
430-37 one in either conductor Thanks
A not so subtle reminder of my age. I installed bunches of 2 overload 3 phase starters in my life. 1978 ? really ? WOW!
I think it was about 10 years earlier. The main part of the plant that I normally work at was built in 65-66 and has starters with 2 overloads. They expanded in 70-71 and those starters have 3 overloads.NEC article 430 (can't remember the exact paragraph) has required overload protection in all ungrounded legs ever since around 1978. The old 3 phase starters with only 2 overload devices have been illegal* since then.
*Illegal is, I know, not the appropraite word, but I use it in the context of a code violation for new installations of course. There are no "Overload Police"... yet.
benaround said:One in EACH conductor
Jreaf said:NEC article 430 (can't remember the exact paragraph) has required overload protection in all ungrounded legs ever since around 1978. The old 3 phase starters with only 2 overload devices have been illegal* since then.
NEC article 430 (can't remember the exact paragraph) has required overload protection in all ungrounded legs ever since around 1978. The old 3 phase starters with only 2 overload devices have been illegal* since then.
*Illegal is, I know, not the appropraite word, but I use it in the context of a code violation for new installations of course. There are no "Overload Police"... yet.