Resistence Welding Transformers

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dmp66

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What size supply wire and fusing should be used with a 43kva single phase 480 volt trans gun resistence welder. What is the formula to calculate wire size for these transformers.
 

bennie

Esteemed Member
Re: Resistence Welding Transformers

Use primary current times the duty cycle.

Primary current = 43000 divided by 480= 89.5 Amps.

A 50% duty cycle will be .71 X 89.5= 63.5 Amps.

Use wire with 63.5 Ampacity.

[ April 12, 2004, 11:21 AM: Message edited by: bennie ]
 

dmp66

Member
Re: Resistence Welding Transformers

bennie: in the calculation where did you get the .71 when figuring the 50% duty cycle? Is it a constant?
 
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