g.mccormick
Lifetime Supporting Member
I have a heater control panel that I am making. The heaters are 2X 25KW 480V 3phase.
The only thing in the panel will be disconnect/breaker, fusing for each scr/heater, small control transformer fused for fan.
Heaters will each consume 30A@480V. Fusing at each SCR will be 45A (125% of 30A).
Do you think I should just use an unfused disconnect in the panel and assume the customer will size feeder breaker correctly? Or would you all suggest that I use a fused disconnect (or probably breaker) sized correctly for panel?
Sizing would be (45A*1.25) + 30 + 1A (assume for control transformer) = 87.25A
Next size breaker = 90A
What is everyones opinions?
The only thing in the panel will be disconnect/breaker, fusing for each scr/heater, small control transformer fused for fan.
Heaters will each consume 30A@480V. Fusing at each SCR will be 45A (125% of 30A).
Do you think I should just use an unfused disconnect in the panel and assume the customer will size feeder breaker correctly? Or would you all suggest that I use a fused disconnect (or probably breaker) sized correctly for panel?
Sizing would be (45A*1.25) + 30 + 1A (assume for control transformer) = 87.25A
Next size breaker = 90A
What is everyones opinions?