- Jan 31, 2018
- 1,276
- 1,211
- 1,688
- If you're a qualified, trainee, or retired electrician - Which country is it that your work will be / is / was aimed at?
- United Kingdom
- What type of forum member are you?
- Practising Electrician (Qualified - Domestic or Commercial etc)
- If other, please explain
- SJIB/SECTT recognised apprenticeship.
SVQ level III electrical installation.
City and guilds 2382 (18th)
City and guilds 2391-52 (I&T)
City and Guilds 2919 (EV Charging)
- Business Name
- MFS Electrical
anyone else got one? Ever used the R1+R2 setting?
Was testing a socket circuit for a minor works yesterday fed from a 36 way TP&N DB Everything except the fire alarm was wired in singles through trunking absolutely none of the earths were remotely near the terminals that they should have been in like circuits down the left side had cpcs on the right side earth bar and in no particular order. Also vice Versa and some left side cpcs in the left side but again in no particular order
The nuetrals were all in the right place but it looks (the ones I checked anyway) so it ended up taking me about an hour to find the earth for the circuit I was working on which was at the top of the left hand side so really should be in the top of the LHS earth bar nope was in the middle and the bottom of the RHS earth bar (it was a ring)Anyway found it done R1+R2 all good and superb readings so definitely found the right cpcs.
It got me wondering if in a case like this I’d have been better off using the R1+R2 setting on the megger like turn it to Zref get a Ze from the phase that the circuits fed from and then turn it to the R1+R2 setting and batter out the tests that way I was curious as to how accurate it was and every single reading I took was within 0.02 ohms of the actual R1+R2 readings some were actually dead on just wondering if it would actually be acceptable to use this setting or if it would be frowned upon? Obviously if the cables and CPCs are all in the right place I’d do it the right way cause it’s easy enough when you don’t have to go searching (and I know I could have just done an R2 but I wanted the R1+R2) what’s your thoughts on using the R1+R2 setting in circumstances like this?
Was testing a socket circuit for a minor works yesterday fed from a 36 way TP&N DB Everything except the fire alarm was wired in singles through trunking absolutely none of the earths were remotely near the terminals that they should have been in like circuits down the left side had cpcs on the right side earth bar and in no particular order. Also vice Versa and some left side cpcs in the left side but again in no particular order
The nuetrals were all in the right place but it looks (the ones I checked anyway) so it ended up taking me about an hour to find the earth for the circuit I was working on which was at the top of the left hand side so really should be in the top of the LHS earth bar nope was in the middle and the bottom of the RHS earth bar (it was a ring)Anyway found it done R1+R2 all good and superb readings so definitely found the right cpcs. It got me wondering if in a case like this I’d have been better off using the R1+R2 setting on the megger like turn it to Zref get a Ze from the phase that the circuits fed from and then turn it to the R1+R2 setting and batter out the tests that way I was curious as to how accurate it was and every single reading I took was within 0.02 ohms of the actual R1+R2 readings some were actually dead on just wondering if it would actually be acceptable to use this setting or if it would be frowned upon? Obviously if the cables and CPCs are all in the right place I’d do it the right way cause it’s easy enough when you don’t have to go searching (and I know I could have just done an R2 but I wanted the R1+R2) what’s your thoughts on using the R1+R2 setting in circumstances like this?
