Discuss Anyone have American electric questions? in the USA area at ElectriciansForums.net
Everyone on this forum has been great in answering all my 17th ed questions,
pls lmk if u have any NEC [American electric] questions, I will be happy to answer
What electrical testing is required, on a newly completed domestic installation according to your NEC code requirements??
the trip setting on our gfci outlets is 5mA designed to be below the lethal shock level. Us Yanks dont see the advantage of a trip level of 30 or 300mA which would allow a lethal shock without tripping.As far as i can remember... in households, they are only required for outdoor receptacles and bathroom receptacles, i could be wrong there, but not too far out!!! They certainly don't make use of RCD devices as we do in Europe. Tripping value is 6mA, and mainly incorporated in the receptacle outlets, although some circuits will be supplied by RCBO type breakers in the enormous DB panels....
yes, we mostly use what you call TT systems. think about this: A= v/ohms. for 120v and maximum allowable ground of 25 ohms, 5 amps flow and the 20 amp breaker wont trip.
But the 5 or 6 mA gfci will, so lethal shock is prevented. in a British system, 30mA RCD, you would be dead.
How's it goin lads,don't use this forum much,this is my first thread.Gona start using it much more now.Anyway,Im a spark from N.I looking for work in either Afghan or USA.I was told that a British certified electrician would not be recognised in USA,and that I would have to apply for an apprentice journeyman's state licence,taking up another 4 years! Is this true?
This info was given to me by a fellow user on Flour corp's logcap forum,who is himself a (USA) journeyman working in Afghanistan.I found it hard to believe,I expected an update course of some discription.
Any opinions or info would be appreciated.cheers lads
yes, we mostly use what you call TT systems. think about this: A= v/ohms. for 120v and maximum allowable ground of 25 ohms, 5 amps flow and the 20 amp breaker wont trip.
But the 5 or 6 mA gfci will, so lethal shock is prevented. in a British system, 30mA RCD, you would be dead.
Correct! Which is why the customer many times calls for ground rings in their installations. The NEC sets minimum standards only.Your NEC doesn't call for, or state a ''maximum'' rod Ra of 25 ohms. It notes a stated recommended value, and if that value cannot be obtained with a single rod then another rod must be provided. Your not even required to test the second rod, or the combined value, as according to the NEC, providing the second rod fulfills obligations...
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