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Many thanks to you all. All comments, formulae and links are very helpful. Regards peterp.

Can anyone give me a quick rule of thumb method/ formula to calculate the minimum safe (below the lower explosion limit LEL) ventilation rate required to ventilate a battery room whilst boost charging both valve regulated and lead acid batteries?

Thanks Guys Very helpfull Regards PeterP

General system fault level is specified at 35kA Part of installation involves small isolation 50kVA Tx's before dist boards for lighting & small power etc. (415/433V) What is best way to calculate expected max fault level to be expected at secondary terminals? Z = 6% I am looking to rate the...

Thanks Alehman, Yes I've used this kind of joint on buried tape joints. They are very good. But if you've got a client etc who wants the joints brazed, well you have to do it. I need to know what is used as the most cost effective method. Type of gas torch. Type of flux. Type of filler...

The spec is that all copper earth tape joints must be brazed. Fault level is 15kA. Size of tape is 50mm x 6mm (300mm²) What should the joint overlap measure and what is the best filler material to use to gain optimum strength and conductivity? Would a butted "T" joint be acceptable IE...

Thanks for that jabartos, since I posted the thread I've seen a copy of the French Regs. It seems quite clear that emphasis is mainly payed to the neutral which is to be light blue and earth gr/yl. I reckon that live phase conductors are usually black, but not always, as in most european...

What is the usual preferred colour code for the three live and neutral phase conductors and earth (cpc) cables in France. This is with regard to industrial and domestic power.

Can someone please give me any document or specification details pertaining to earthing and insulation requirements of metallic structures sited near high voltage pylons or masts G78???

What's the easiest most accurate way to quickly calculate the heat generated from DC equipment such as rectifiers, radio cabinets etc.

The standby generator in question is on a large telecomms site, is 200KVA and for the clients reasons needs to be so. It doesn't "plug in" it is hard wired.

Please what is the safest and most cost effective way to keep a 3ph & N + E generator supply isolated (including the generator earthing system) when not in use via the 4* pole c/o contactor? I want a seperate earth and neutral wire to the installation from the earth/neutral star point on the...