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Your only going to be able to change the breaker if the existing cable size / installation method will alllow you to uprate the breaker along with the Earth loop readings allowing you to fit a type C. But if that circuit was being wired from new i'd probably design for a 10A Type C

Having a problem trying to find the actual "maximum Values" for ZE, or im just going blind.. Whats the reg number for them ? Are they actually in the Regs ?

I called Central Networks on a job I was doing Last year and told them it was a metal cutout enclosure, The woman on the other end started to sound a little worried an hour later two Vans turned up outside and started digging the womans drive up. Apparently they have had instances with the...

Has this problem started since you put the upstairs lighting on the RCD? If it has only started since the RCD has been on the circuit and it only happens when you use a switch on that circuit is it any switch or have you narrowed it down to just a couple of switches on the circuit? The...

There is often a small retaing screw so you will need to release that first, then as it says just pull the knob in the middle. You may have to use some force but the whole front will pull out. undoing the knob will only allow you to adjust the time settings so its best to do it up tight and...

Take a look at a company called Scolmore and there minigrid range. its similair to grid but without the yolk, the switch modules screw straight into the faceplate so it looks a lot neater and will match everything else.

I can see what you are getting at, however I think you may be taking it to literally. The SWA is suitable to be used as a CPC however in some circumstances a particular size of cable the SWA may not meet the size requirments for a given circuit. This would not mean that the SWA was not suitable...

It will still offer Mechanical protection and the amouring will still need to be earthed you just cant use it as the circuit CPC. Either install 3 Core or a seperate earth cable.

This also may be usefull www.earthingnuts.co.uk/pdf/pvc_xlpe.pdf

You are right you should not run a breaker on its tripping curve. But since MCB tripping curves are 1.45* the current rating in this case it doesnt come any where near.

so you would wire a 8kw shower on a 40A for the sake of a 2A overload.

Becuse a circuit was designed with a small overload and doesnt instantly meet every single requirement of the regs? There is more to designing circuits then sitting in an Ivory Tower with a regs booked ramed up your a**

Your correct the electrician could not know how people will the shower and if you want to say that then you could never apply diversity to an installation. You have to account for what is likley or unlikley and it is unlikely for someone to be in the shower for more then an hour. It would be...

The design of the circuit may not on the face of it meet 433.1.1 (i) its does not mean that the design of the circuit does not meet the requirements of BS7671:2008 The circuit does meet 433.1 in as much as you are unlikley to take a shower for more then an hour. you could also read all of...

Well the MCB should carry 1.13 * its rating for 1 hour without tripping. So 40*1.13 = 45.2A. Unless you take extremely long showers I shouldnt worry and at least its wired in 10mm..

Doesnt the OP say that it will be fused at 200A, if 70mm is rated at 192A then it would not comply, also being a boiler room im gussing ambient temp is going to play its part

if you test an RCD protected circuit on the HI setitng then the RCD will trip that is why there is a RCD no trip setting, and yes you will get the same reading (within reason).. when doing an EFLI test on the high setting you only need to use the Live and Earth leads on the tester however when...

The RCD is tripping on the circuit when the MCB is turned of becuase the neutral is still connected for that circuit so when you cut the cable you are creating a Neutral Earth fault which is tripping the RCD.. the ony way to stop it is to disconnect the corrosponding neutral form the board for...

I went to a similair fault that you are having and found out it was a fault with an in-line water heater causing all of the pipework to become live this mixed was the fact there was no bonding no rcd protection of any kind on a TT system led to an Extermly dangerous situation.. however at...

Sorry guys my fault. The two small cables coming from the right are yellow/green earth and the small one going into the CU in earth. The cable goes outside by the front door and you can see a little earth cable and then it's buried. about 10cms from where it goes into the ground is what...