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think that makes a little more sense. does any one know where there might be examples how these are wired? Ive seen some that are a big loop and others that have a resistor at the end of the circuit and i dont really know which is which. Also is there a set method to wiring them, like...

well how, when they go off, does the panel know which sensor has gone off on an addressed system? There just loop in / loop out so i dont understand how the panel knows what is what. If you get what i mean.

Ive had a search about and even bought a book ( which was turd ) about wiring fire alarms and how they work. Can any one reccoemd and good sites for info or a decent book that explains it clearly. Cheers.

think i understand now. Thanks for clearing that up for me.

whys that then matey, just out of curiosity. Is it becuase halogens are dirty energy zappin whores?

got'cha. but i thought lights in a house are installed in parallel. so you couldnt just add the wattage up?

Hey just a quick question, ive got 9 x 50w halogen down lights that i would like to switch from a dimmer. How many watts is the switch goin to take? because ive got a 250w one and it smellys a little funky.

Right, think i get you now. Cheers for that.

Hey, cheers for . Any chance and one has any diagrams how there wired differently?

Hey, Cant really get my head around emergency light. I get theres maintain and non-maintained but not all that sure how there wired. Any one have any sites they know which might help out? Cheers

Right, im on an apprentership and at the end of it want to go chasing the money while im still young. The thing is i dont really know whats what when it comes to gettin it goin. When i finish i'll have city and guilds 2391 qualification. So do i need to do an additional testin course or is...

Well the cable is a 10mm on about 15meter run. So the cable is ample. I thought Type B mcb required 3-5 times the operation current to trip, therefore i thought a 40 amp breaker would be sufficient

At my work im able to get hager Type B MCB's. The thing is im installing a 9.5kw shower, which is 41amps ... They only have 40amp and 50 amp breakers, ideally a 45amp breaker would be best, but will i get away with using a 40amp? Cheers

So just to make sure a 6A Type B MCB Would only blow when a fault current of 18A - 30A? Also, another question. I was wondering why is it required for a double poled switch or fused spare to by used when installing an extraction fan in a bathroom? I dont understand why you have to isolate...

Think thats cleared my questions up! Cheers you two.

Right, well im a training spark and i had a few questions i wanted clearing up. 1, Why does a double insulated load not require an earth, whats so different about it to any other load, i mean why cant you get a shock off it? 2, There are different types of MCB's arnt there? like A,B,C and...

Theres an RCD protecting the whole mains, rated at 30mA. Yeh im aware of part P, as i work for an electric company im goin to get one of the guys from there to assist with it. Just wanted to make sure on everything before starting really.

Firstly, I have an electric shower that requires wiring up. Its 9.5kw and the cable is about a 20 meter run going through some trunking and the loft, which has insulation. Can some one explain to me what size of cable is required as i dont exactly know how to use the correction factors...