Recent content by jbingham

PS If you were going to reply:  If a competent person is doing the work then he will know what to do / he will know the answer: Perhaps he should, but not all competent persons know the answers to everything! And to give an example, the NIC badged guy whos testing our factory ATM - he...

Thanks for the further replies chaps. I could spend more time explaining myself, but I came on here hoping to get a straight answer to my question from a few individuals.  Only one person so far has actually done that. For the purposes of my question, It is irrelevant whos doing the EICR, how...

Testing hasnt been done yet. So far, a lot of time has been spent doing a very thorough visual!  If necessary, FI will be done.  Did a cowboy write 411.4.204? And did cowboys teach and write the literature for the 2391 course??   (Using an RCBO on a TN-S if really necessary wasnt my idea to...

In a nutshell, is it OK for the 30mA RCD in the meter tails to provide shock protection for the final circuits - if the final circuits don't meet Zs (because the R1+R2 measures too high). And I'm asking this because I can't fit rcbo's. Plus there were 2 other questions at the bottom regarding forms.

Thanks for your replies so far chaps. Can anyone offer me definitive yes/no answer(s) to my question(s). Thank you

Thanks, but Iam looking for a straight answer to my question(s). And I know the eicr will - IF it is done by somebody like you say. Sure if type 2,3 BS3871's were in this scenario, then I would really struggle to meet Zs, but I haven't mentioned them!

Thanks for that, indeed it does, but the regs/guides don't give a wide range of examples so I can't determine whether its OK for one RCD (protecting the board) to do the job or whether each potential problem individual circuit needs its own RCD (an rcbo). That is what iam asking. Would you say...

It might have been frowned upon, but it was allowed. I guess if someone had not designed a circuit properly/extended it too far, or there was a bad connection somewhere that couldn't be found, then sticking an rcbo in would at least make it safe/get you out of hole. 

Thanks for your reply. I agree with what you said. There must be the odd occasion (for whatever reason), that the MCB is swapped for a rcbo because that's what I was taught on the 2391 course. But I can't do that on this occasion, and that is why I was hoping someone could tell me if I can rely...

Its definitely TN-S. The RCD is of some age/has been in use for many years. Hopefully it will pass on Zs readings/ADS, but iam asking the question just in case it doesnt. I remember when I did my 2391 many years ago, we were taught to replace the MCB for a rcbo when you couldn't meet Zs, however...

Hello Gents, I have been out of the trade for a time (hence Im a bit rusty) and need to ask the following so I know where I stand regarding this scenario! Does a DNO 30mA RCD Isolator satisfy 411.4.204 (411.3.2.2) Scenario is: Domestic property, late 60's/early 70's, TN-S, old wylex 4 way...

Thanks gents, for taking the time to reply.  You've answered my questions perfectly.  With the thermistors, my thinking was - if there was a weak point of insulation on a thermistor (or the thermistors circuit wire insulation within the windings), then the test voltage would leak from the...

Hi Everyone, Im a new poster.  My question regards IR testing a 'locally' isolated 3ph motor on an industrial machine, where the rest of the machine is still powered up. Scenario: This question could apply to numerous machines, but lets say this machine is an oven line with 3ph motors driving...

Hi Everyone, Im John from Congleton in Cheshire. I decided to make a career change from draughtsman to electrician back in 2003 and have been working as a maintenace/installation electrician and mech.fitter since autumn 2006 at a large textiles factory. I plan to give being a self employed...