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In Brazil, the National Standard (NBR-5419) regarding protection against lightning, establishes that hazardous areas should have yours items placed outside volume to be protected, in other words, the air terminals and down conductors, could not cross the areas that the classification shows as...

I need buy a 850 HP water pump drived by diesel motor, my client prefer electric DC motors to starts the motor, but my experience indicates, in this case, pneumatic starting is more usual, safety, economical and realiable. I don't find suggestions about it, on ANSI ou IEC etc. What is better?

In the European countries IEC Codes imposes circuit breakers, in the panel-boards, with residual current ( 100 mA) for personnel protection ? For all circuits or only for socket outlets circuits? Thanks for attention A. Pinto

We are installing a power systems (motors and lighting devices ) inside a Class II , Div.1 locations , but our purchaser call about installation using IEC not NEC Standards. We are reading about and think that we can use cable trays with cover and cables inside it without armored sheath, in...

I need put a liquid natural gas gen-set inside a generator room. The question is: I need consider this area, a hazardous area, according NEC or IEC rules or not? I think that if a put an air removing system, like a exhaust fan, I can consider a non-hazardous area; naturally, I need stop the...

I need put a liquid natural gas gen-set inside a generator room. The question is: I need consider this area, a hazardous area, according NEC or IEC rules or not? I think that if a put an air removing system, like a exhaust fan, I can consider a non-hazardous area; naturally, I need stop the...

We are making a short-circuit calculation now, for industrial plant, and needs information about considerations of contribution of high power motors using soft-starters (without by-pass contactors)during short-circuit time. The question are: We need consider its contribution for short-circuit...

We are making a short-circuit calculation now, for industrial plant, and needs information about considerations of contribution of high power motors using soft-starters (without by-pass contactors)during short-circuit time. The question are: We need consider its contribution for short-circuit...