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I agree with BAS about the qualified electricians. I'm one of them, I've done my qualifications privately but still wouldn't trust myself to do a job on my own!! I feel I have enough knowledge without experience to assist but nothing more. People jump to far ahead, personally I'm going to get...

Thanks Gary.

Thanks spark but apparently it is 5s. Two hours after posting that I took my C&G 2382 and that came up! Of all the questions... Going through the regs this last week,there are so many contradictions! by the way, anyone know what 125 v D.C is classed as? Extra low/low/ reduced low/ SELV I went...

Thanks. How do I do that? So if it's a mistake , is it wise to go for the lower disconnection time?

What do we make of this. Reg 559.10.3.3 states: A maximum disconnection time of 5s shall apply to all circuits feeding fixed equipment used in highway power supplies for compliance with reg 411.3.2.3 TN systems ot 411.3.2.4 for TT supply so reg 411.3.2.4 states that a TT system shall have a...

Can u explain more please holmslaw?

I'm being stupid but for some reason I can't remember the answer. I've seen main switches rated at 100a and some at 60a. If I was installing a main switch what would help me determine what size rating to use? Apologies if I've asked this before because I fear I have but can't find the bloody...

ah could have been that. I am extremely short and couldn't see the whole component due to the height. Is the short circuit rati h usually printed at the very top?

Another question I went to a friends house who lives in a brand new barratts home. Being nosy I looked at the CU and saw a split board protected by two RCDs rated at 0.8mA. The house is a very simple two floor house one RCD protects d/s lights u/s sockets cooker. Another RCD U/s lights d/s...

Yes BAS it will be a thread of questions. I have yet to recieve my book that I'm going to get and in the mean time I'd just. Like to ask questions here as I go along the book otherwise I'll forget by the time I get the book and than I can make notes in my book .... :)

Regulation 552.2.1 what is meant by excitation and commutation. I gather the excitation, but commutation?

I never said it did.

no holmslaw I got that thanks I was Reading section 543.7 earthing of equipment with high protective current. Understood the earthing just couldn't think of an equipment example.

WHat is an example of a piece of equipment having high protective conductor currents?

WHat is an example of a piece of equipment having high protective conductor currents?

Thanks for your help guys makes more sense :)

Just so I'm clear, the MCB is the downstream device that's withhold energy has to be bigger than the downstream fuses let through energy?Otherwise the let through energy would activate it?

536 Co-ordination of protective devices a lower breaking capacity is permitted if another device (a back up protection device) having the neccessary breaking capacity is installed on the supply side and the characteristics of the devices are suitably ci o-ordinated such that the energy let...

17th edition states regulation 531.5.1 where protection is provided by an rcd and disconnection following a first fault is not envisaged, the non-operating current of the device shall be at least equal to the current which circulates on the first fault to earth of negligible impedance...

Believe me my gratitude does not lack with anyone willing to help :D