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donno...

no comment, as stated 80% is better than 0% and 100 Amps through an old 60 Amp CU with 16mm2 supply feeds is also not that good, I'm just doing what the organisation (in Potters Bar) said I could/should do, as verbatim, do all the tests and state the departures (that I disclosed - no cpcs to...

cause my DI assesor (actually local authorities technical organisation) told me that it's OK,(to proceed) but I thought that I'd put it on this Forum, however I won't use this for my elecsa rating case

yea just read that on another forum, basically it says don't do it (ie do not replace the CCU and leave the lighting circuit dissconnected ("F**k-off" - not you !!, so no disrespect intended) - no lights, thats even more dangerous! and no RCD/RCBOs etc etc , thats dangerous, my thoughts are...

[/url] thx , thats very enlightening, but a mockery as it ultimately states "do not proceed with the replacement CCU" surely a newer split load RCD/RCBO at the correct rating is MUCH MUCH better than an older fuseable CU, or is Part P "an ASS"!!!! (or I can just do it and not advise that...

I can't - it's going down as a departure... told that's Ok as long as I state it...

[/url] I think that I do need to measure for R2 as it dosen't exist on 1/2 of all lighting circuits (that's what was the norm in 1963)

am in the process of measuring R2 using the wanda lead method as can do live, R1+R2 measurements will have to be done when all isolated later next week..

yes, done all that, Ze = 0.4 Ohms, Zs is about 0.57 Ohms, am measuring R1+R2 and also R2 in stages as and when I can isolate circuits etc The form came off a "mega Part P" CD from Ebay...

I am not Part P etc qualified, but are using the upgrade of my CCU as a "case" I have all the necessary equipment Megger 1552 etc. There will be departures, due to the age of the house (1963), all of the upstairs lighting has no cpc and some of the downstairs has no cpc. The rest is fine. It's...

yes it's a radial or light circuit, Zs is "automatically" measured using my Megger 1552, and I've measured Ze, both are consistant, Zt apears on Form "WR4" - Installation Schedule (including test results) and is described as Earth loop impedance, I think it's a typo and should be labelled Zs

What's the difference between Zt, Zs and (R1+R2), I thought that Zs was the loop impedance, Zt ? and either R1 or R2 can be measured directly or derived from the difference between Zs and Ze, or am I totally confused?!

On an Installation Schedule form (including test results) does the no. of points refer to actual sockets (ie a double socket = 2) etc or a point as in the term a connection which may mean a double socket =1