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Yes within the last 2 weeks, Imust apologise my first post wasnt very clear, I do not mean the tests were carried out at the same property with fluctuation but at different properties altogether, I was just wondering why they changed so much and if they should be similar figures as probably...

Testing with meter, I prefer not to calculate

What is the relationship between ZE & PFC readings, sometimes they measure around the same amount and sometimes very different eg, ZE 0.13 and PFC 1.57 If the readings are further apart does this indicate anything, same as if they are similar readings does this indicate anything ?

Surely RCBO'S will be ok, They are there to protect the cable, not the heater and each RCBO will be rated at suitable amps, I did mean watts not kw, as im sure you all knew really !! Thats a good video clip not far off what really happened to the property altough not down to the...

Ive just worked out the rating @ 22990 kw in total (existing units) not including the immersion heater, Ive decieded to use RCBO's now to limit any tripping issues, I will have to talk to the householders to see how I can reduce the amount of heaters, there are actually 13 heaters in total.

Hi, The reason I was going to use RCD was because of the cable installation method - chased in wall etc etc I shall work out the total load in a bit but afaik 1 way is unused and 1 is water element The property is undergoing a full restoration however it is an old stone cottage

I need to replace a 12 way storage heater board and intend to us a 12 way dual rcd board, poss MK, RCBO's are too expensive, Whats peoples views on doing it this way ? or any problems I might encounter ?

Today I went back to the scene of the crime, and put L,N, AND E on as normal still no luck, fitted an RCBO to board with no outgoing still no luck, took off the earth connection and connected it with neutral probe and they all worked fine, however with either the N or E disconnected test would...

Its a Metrel 61557, I did have a voltage reading so im still confused !! going back on Wednesday so will try again !

Thanks for your replies, my tester is due for calibration next month so i may snd it off early !! thanks again

OK Thanks , because none of them tripped out this way I assumed it may have been normal for an RCBO to behave like this,

No but no load and nothing plugged in, Why would this be an issue ?

100 %

Yep earth connection was fine meter would have failed but double checked as well.

ZS was 0.20, on old board was 0.55

Sorry, they all tripped when the test buttons were pressed but not when tested accross out-going, pfc = 0.23, ZE = 0.24

mmm, I thought so but none of them tripped out this way and there are 5 fitted. Thought maybe it was due to being a pod set up.

When I tried to test at the rcbo it would not trip, only when i plugged my tester in at the socket would it work, is this normal for RCBO's ?

Its a 30ma, disconnection times are x5=40 and x1=125, when tested on old board was x1=146 and x5=22,

Hi, Ive fitted a new fuse board, having RCBO's for some circuits (commercial) when I was doing the testing one of the RCBO's had a much higher disconnection time than all the rest, circuits all tested out fine, changed RCBO and still rubbish! Its MEM Eaton MCB with pod fitted. Any ideas why...