Looking at 630.13 it says A disconnecting means shall be provided in the supply circuit for each arc welder that is not equipped with a disconnect mounted as an integral part of the welder. The disconnecting means identity shall be marked in accordance with 110.22(A).
The disconnecting means shall be a switch or circuit breaker, and its rating shall be not less than that necessary to accommodate overcurrent protection as specified under 630.12.
No mention is made of cord and plug unless you consider the phrase a disconnect mounted as an integral part of the welder to include a plug and cord, which I believe it does.
It does say The disconnecting means shall be a switch or circuit breaker but I believe this is referring to the required disconnect if one does not exist on the welder, not a requirement that the integral disconnect on the welder be a switch or a circuit breaker. If this is taken to mean that the integral disconnect on the machine must be a switch or a circuit breaker that would mean the NEC is telling the manufacturer how to build the machine, which isn't in the scope of the NEC. A portable welder manufactured with a cord and plug already has the integral disconnect mentioned, making the rest of the wording of 630.13 not applicable to that machine. IMHO Thoughts?
Last edited by BigB; 06/07/23 12:43 PM.