Transcription of HOW TO WIRE FOR AN ELECTRIC WELDER
1 ANOTHERG & G ELECTRIC AND PLUMBING DISTRIBUTORS, SHEETCOPYRIGHT 198919 These How-To-Do-It sheets have been reviewed in June 2007 by a professional Engineer. If you find a problem, pleasenotify G & G ELECTRIC & Plumbing at 1900 NE 78th Street, Ste. 101, Vancouver, Washington 98665 HOW TO WIRE FOR AN ELECTRIC WELDERE lectric arc welders are common homeshop tools. One size, the 225 amp model, hasbecome the standard of the industry. Even ifyou have made up your mind to buy a smalleramperage model, we would still recommendwiring the circuit to accommodate the largeramperage unit. The cost of doing so is justslightly welders of the workshop "buzz box"type have a duty cycle which seldom exceeds30%. The primary current required by thissize AC transformer type WELDER is about 50amps at 230 volts.
2 We recommend wiring thecircuit with #8 copper or #6 aluminum size smaller wire may be acceptable, butverification should be made before beginningthe installation. Once you know the duty cycleand the primary current requirements of thewelder, you can look to Article 630-11 of theNational ELECTRIC Code for the multiplyingfactors by which the conductor size can circuit breaker that is most often usedon WELDER installations is a double pole 60amp size (in which case the feeder conductorsmust be sized accordingly) although the 50amp size is usually more than adequate toserve the light-duty work for which mostworkshop units are disconnecting means is required at thewelder. Most small AC transformer typewelders have one built in that also doubles asan on-off switch.
3 The connecting cord (pigtail)is usually provided with the and flush mounted receptaclessimilar to those used for range outlets areavailable for WELDER receptacles. When theflush style receptacle is used, the best box touse is a 4" square, 2-device metal box with3/4" knockouts (same box that is used forrange receptacles). Standard 50 amp welderreceptacles have a pattern that looks like this:For complete requirements for wiring for an ELECTRIC WELDER , we refer you to Articles 630 or the NFPAN ational Electrical Code, especially Articles 630-11 and 630-12.
