630.11 Ampacity of Supply Conductors
Table 630.11(A) Duty Cycle Multiplication Factors for Arc Welders
|Duty Cycle||Multiplier for Arc Welders|
|20 or less||0.45||0.55|
Exception: Percentage values lower than those given in 630.11(B) shall be permitted in cases where the work is such that a high-operating duty cycle for individual welders is impossible.
Informational Note: Duty cycle considers welder loading based on the use to be made of each welder and the number of welders supplied by the conductors that will be in use at the same time. The load value used for each welder considers both the magnitude and the duration of the load while the welder is in use.