Recent content by ProMbrooke

115 volts for a 230 volt circuit, 138 volts on a 277 volt circuit.

Yes, but 115 volts for 5 seconds violates the IEC's body graph.

BS7671, Table 41.1. :)

Why do circuits 32 amps and under require a 0.4 second disconnection time at 230 volts, but circuits over 32 amps are legally allowed 5 seconds? 115 volts for 5 seconds is enough to cause injury to the body.

Thank you, will check it out.

Ie, NEC forbidding:

Can anyone tell me if the neutral is distributed aboard ships and if it is earthed?

Ok, say you had a building that needed backup power. Do any British Regs require that the loads be subdivided onto different branches and different automatic transfer switches based on type and priority?  

Ok, I don't thank folks are understanding. There are no line to neutral loads, so there is no PEN or TN-C. It is TN-S without the neutral distributed.  But for some reason the regs want a none current carry conductor to be treated as it would be carrying current. I'd like to earth at both...

It won't, not with everything connected line-line. Perhaps PE would be a better term.

Ok, but why require that the neutral be isolated from earth when it does not carry any load?

I want the neutral earthed in all 3 places, at source 1, source 2 and at the main gear.  Nothing gained by isolating it.

Correct- two sources- but the foot notes say neither can be earthed. Only in the main gear and beyond.

Why is earthing of the neutral forbidden at the supply transformers in a 3 phase 3 wire system? This has me beyond words confused. 

But you have time as well.