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Hi could anyone please explain to me what dead tests are in relation to a partially installed installation, why would they be necessary to be done then, and further more is there any literature I can buy that can give me a comprehensive faut finding and diagnosis overview of an installation...

my girlfriends hair dryer keeps tripping out the RCD inmy flat, any ideas what I should test it for. - its a professional's model, so not a cheapy thanks in advance

Can someone please help me - What is the maximum permitted value of resistance acceptable when verifying the continuity of the bonding conductor? I can't find it in the OSG, REGS or Guidance Note 3 A subtle hint to the page number would be cool. thanks in advance

Iz = In C The above is a formulea for calculating cable size I understand what Iz is and In. But I am having trouble trying to work work out what 'C' stands for. I know its for correction factors. The cable calculation is going to be for multi core 70 degree armoured thermoplastic...

Could someone please give me quick explanation or examples of such devices. Sounds silly I know but the low down but I don't think I'm alone when I say some definitions are just plain confusing. Anyhow Thanks in Advance BUSHY

Ok, I'm doing canble calculations as revision for my forthcoming exam, I've lost pretty much all of my notes due to my ex binning them by accident, anyhow please help if you can with the following 3 x 400watt SON/ I High Pressure Sodium Lmps mounted on 5m concrete columns each fitted with a...

Well I'm undertaking my revision for my exams in june and have come accross a problem I'v lost my notes on how to do cable calcs for 3 phase motors, so if anyone can tell me is there anything different to the cable calcs other than the normal sequence that i should no of? As in the pf...

Ok, I'm revising cable calcs etc, and I would like to know if any1 can point me in the rite direction for information conserning circuits that are housed in conduit and the factors that have to be applied in the conduit sizing calcs. So basically how do you calculate conduit size, in relation...

Well I'm a little confused I'll be honest, I'm reading an Electrical Installation book by Scadden, and in the cable design section he mentions that the diversity in reference of the Regs Table 4D1A (Page 220), can be calculated there. Is this a mistake or am I being incredibly dumb? I am a...

Ok, doing course work for Design Current and the relevant factors to be taken into account i.e.Ca, Ci, Cg, Cf (BS 3036). Ok heres my sticking point, I've just been reading in Scaden on page 345, That if one of the factors is equal to or less than 0.5 (not including Cf), then that one being the...

SELV - so what so special about SELV, anyone give me a practical explanation?

Class 2 Equipment what are the benefits? I know it sounds a little silly, but really what are they? Thanks in Advance

Am I rite in that a 25V socket outlet (BS EN 60309-2 25V) is Violet in colour? Thanks in Advance

Just been reading the OSG, can someone pleae tell me why I the RCS IS Unsuitable as the main Isolator/ Disconector. Is it due to it just monitoring the earth fault loop impedance, and protecting against Direct Contact. i.e. if you wanted to test the installation and Rcd will only isolate...

Other than the old button test can someone point it out to me that is the name of the test. Tell me if I'm wrong but you test at x0.5 x1, x5, to test that the RCD is working fine? I know the load must be disconnected and the earth loop impedance must also be known. And that a TT systems...

I want to buy a 25v isolating transformer to power a inspection lamp thats going to be used in an inspection pit in my garage. I'm going to spur off the local ring main with a 3A Fused switch spur, all I need now is where I can get the transformer and socket can anyone help, please. Thanks in...

Hi I'm instaling a socket outlet in my garage (inspection pit) for a 25v hand lamp. The socket is to a bs en 60309-2 now I'm going to use a violet one, using the below link: http://imagehost.darkernet.co.uk/i/Ceeform.gif What I need to know is the transformer I'm using is a step down one...

I'm abouts to dig an inspection pit into the floor of garage (only 1 metre deep), I know about the need for shuttering and then cementing the pit. But my main concern is damp creaping up from under the pit into the pit any ideas how I can insulate it to avoid this happening. Sounds silly I...

I'm doing some work in garage and shed (Part-P I know), but I'm just trying to understand what these classes mean? Is this right? class 1 - Normal ceiling rose/ batten holder, knockout box/ Pattras? class 2 - Double insulated fitting i.e. No earth required? class 3 - I'm not sure

I'm planning to build an inspection Pit inside of my garage. I've alraedy had it checked it and there won't be any problems with foundations, etc. What my question is what precautions should I make before starting work, the pits only going to 1 metre deep. Any suggetions would really help