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Is the existing wiring able to handle another 15A circuit?

Its easier to light cigarettes at high speed :lol:

Its very easy to calculate Zs yourself. You dont need a reference book. Type C breaker requires X10 rated current to meet 0.4 & 5 second disconnect time, voltage is 230. You have current and voltage so just use Ohms law to calculate impedance: 230V / 320A = 0.718 Ohms rounded to 0.72...

I apologies for creating confusion, and as you have pointed out 543.1.1 refers to earthing and not bonding. The OP did not make it clear if we were talking about earthing or bonding. I decided to comment on both & point out that earth conductors less than 16mm are not always non compliant to...

543.1.1 basically says you can do 1 of 2 things. 1- Either select the earth from table 54.7 which means 16mm earth for line conductors up to 16mm. 2- Use the equation from 543.1.3 to caculate the earth size based on fault current and the time it takes the protective device to operate. If...

As already said 10mm is fine for main bond (up to 25M in length) 16mm for earth conductor is preferred but smaller is not necessarily non compliant. Use the Adiabatic equation

What does the manual say? If you dont have one tou can get it here: http://www.rangemaster.co.uk/index_Rangemaster_Manuals.htm hope that helps

, The 3A fuse would only blow of the load side was shorted. If the supply to the fuse is shorted a fuse will go further upstream

:shock: Surely if you provide a switch it must be accessible?

While you look around pay attention to location and positions of electrical equipment. The cooker isolator switch should be near the cooker but without leaning over it to switch off. Check light positions in the bathroom ie if its directly over the bath, or that the light is suitable for the...

Unusual for a light circuit to be 16A :? How is the existing light operated? Is it by a seperate switch? When you say wire into a 3A box I assume you mean one of these with a surface mount box...

I agree. Earthed metal conduit will also be a better solution instead of using safeplates As long as you don't assume you know what is correct, and seek advise at every stage then im sure you are on the right track. Whoever is going to sign the electrical installation certificate will need...

17th requires RCD protection on all circuits now, unless your house is wired in earthed metal conduit.

Hi, I agree with Pensdown. You will find "The Electricians guide to the building regulations" to be a very informative book, and I would recommend reading it before you get stuck in. Regards

Its Ohms law :D V=IR therefore R=V/I V= 50 as metalwork cannot rise above this figure I= 30mA RCD trip current therefore R=50/0.03 which comes to 1666.66666666

It would have to be a fused spur The existing circuit will need to comply with current regs so I think you will need an RCD at the consumer unit It might need to be 3.5M, but im sure someone else can confirm this Steel wire armour. Whatever cable is used must be suitable for outdoors &...

I would personally be suspicious as to why a 16A has been fitted, and would check the circuit thoroughly before changing anything. If you confirm that its 2.5 throughout and radial length does not exceed 27 metres, then you could probably upgrade to a B20 MCB. If there is no RCD fitted then a...

If its a TN-C-S system you shouldnt export the earth to the shed if there are extraneous parts (metalwork that offers earth potential). Instead you should put an earth rod in, and make the shed TT

Take a look at the chief examiners reports. They will give you an insight into why people fail and the pass rate. http://www.city-and-guilds.com/cps/rde/xchg/SID-0AC0478C-B054AD3C/cgonline/hs.xsl/17381.html As far as books are concerned you will need GN3 as the exam is based on this...

Why did your friend ask you to do it?? Your obviously as clueless as they are :?