That’s the point, a 63 amp rcd won’t trip if it gets 100amps pulled through it, you could wack 1000 amps through it and it will just melt rather than trip.
I suspect the reason this regulation changed is all the burnt out 63 amp rcd’s having 8plus circuits hanging off them.
It has No overload...
An upfront ocpd of the rcd should be equal to or less than the current rating of the rcd, if the combined mcb’s downstream of the rcd have the potential to exceed the ccc of the rcd, then it should be coded on an EICR .
Diversity of the final circuits alone is no longer acceptable for providing...
A global IR test is done with the main switch in the open position and all the final circuits in parallel, mcb’s closed, not possible to do with all ocpd’s being rcbos.
Hager rcbos allow for IR test at their terminals as it’s stated on the device, with obviously the ocpd in the open position
132.16
Before installation of a new DB then this regulation should have been verified anyway.
If you can verify the bonding then don’t carry out the work.
A lot of people mistaking believe that you bond a water, gas or heating pipe incase the pipe becomes live. Obviously that is not why we carry out bonding, however it is obvious that electricians who believe this really need to go back to the basics and the understanding of what an extraneous...
I think that the best practice guide is a good form of guidance and is worth a read for anyone involved with inspection and testing but I think westward maybe referring to the fact that inspectors rely too much on it and should refer more to bs7671?
Your example is for a TT earth fault where only a low current would flow resulting in an ocpd not operating.
If you measure the L-N loop like the PSCC on a TT , then you will find that to be typically in the low impedance values similar with doing ZE testing in a TN arrangement.
This subject has been done to death and it winds me right up that supposedly competent and skilled persons are supposed to carry out this type of work, yet they don’t understand the basic requirement to inspect and use the current edition of the wiring regulations as a tool to recommend...
That is incorrect, tell me, as anything we code can be backed up by a regulation, what regulation number would you refer to if for example , sockets upto 32 amps non rcd protected supplying mobile equipment outdoors?
The answer is that you cannot as the 16th edition did not require rcd...
You are definitely NOT there to test to the edition it was installed to.
You inspect and test to the current edition of the wiring regulations.
I cannot understand the difficulty in electricians undertaking EICR’s understanding this basic requirement.
I think whatever scheme you want to join, they now insist on a level 3 NVQ , the current edition of bs7671and possibly inspection and testing as a minimum as to avoid the 5 week electricians carrying out and certifying their own work.
I maybe wrong but I believe the likes of the Niceic have...
The height of zone 1 and zone 2 are limited either by the horizontal plane corresponding to the highest fixed shower head or water outlet, or the horizontal plane lying 2.25 m above the finished floor level, whichever is higher.
So it is the finished floor level you go off.
These Official Forum Sponsors May Provide Discounts to Regular Forum Members - If you would like to sponsor us then CLICK HERE and post a thread with who you are, and we'll send you some stats etc