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I think you guys covered this one pretty well. For what it's worth: 1) I also size primary OC at 125% primary current at full nameplate load as a rule of thumb, whether or not I have OC protection on the secondary. (Based on NEC table 450 -3) 2) Any loading above nameplate is definitely an...

I thought Div 2 means "where explosive atmospheres may be present from time to time during normal use" (paraphrased approximately). If it's a classified area, you must use rated equipment. This is probably to cover those occasions, even if infrequent, where the pump may be exposed. Have a...

Hi Jacphi, I was taught not to rely on the continuity of the door hinges because they may eventually corrode. So I always put a ground wire on a weldstud on the lower left inside corner if the door has any AC powered door-mounted items. Regards, NEMA6P

If you want to avoid interoperability problems, I'd do what RonShap suggested;get a combo unit. Probably a breaker rather than a recept. If you don't use a combo unit, put the AFCI closest to the load. The GFCI uses a differential current transformer to look for current imbalance between hot...

Practicality aside, you are better off from a legal liability standpoint to get a pump that is approved for use in a class 1 div 2 area. The pump vendor should have 3rd party regulatory approval of his unit from UL or Factory Mutual or similar. That way if there was ever a problem, you...

There are a lot of companies that make key fob transmitter/receiver sets. They are available as a commercial product intended to be used as a component part for another system such as the one you are designing (whatever that is). Many of these purchased solutions are pre-engineered/pretested...

I am an EE working for a company that makes GFCIs and extension cords. I've never seen any green liquid in any of our stuff returned from the field. But I have seen green corrosion on cord cap blades that have been exposed to dampness or water for a long period of time. The most common alloy...