Pip
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- Reaction score
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Hi Guys,
Called out yesterday morning client has 2 x Wylex Boards with MCB's each has a 63Amp, 100Ma RCCB as the main switch on a TT System.
Board 'A' is the main 24hr feed for the house, Sockets., Lights etc 8 circuits
Board 'B' is the economy 7 night storage heaters. feeding 7 circuits. Midnight to 7am
A Smart meter has been installed recently, where the neutral is split to feed both boards and of course the 2 live feeds. No issue there I think?
Problem they have had for at least 12 months they tell me, happens more in the winter months, is intermittent tripping on the Board 'B' RCCB when it is not energised.
Most recently one afternoon when they put the kettle on and then a small table light, the lamp blew, which they do, only it tripped the Board 'B' RCCB
OK Live - Neutral imbalance due to the lamp blowing but why Board 'B' and not 'A'
Both Boards are 20+ years old and have a cupboard built around them so getting access to the circuits is difficult without destroying the cupboard.
All I have done is RCD tested x1= 17.3 x5 = 5.0 (I know not a requirement but meter does it) Ramp test at 85Ms. BOTH Boards tripping at the same time during these tests. Should They?
PFC 0.48Ka & 0.47 Ohms at a kitchen socket very close to the boards.
So before I remove the cupboard and make a mess to start IR all the circuits etc. does the panel think its a weak RCCB on Board 'B'?
Board 'B' still live somehow?
I don't have a Earth Leakage Clamp Meter, but reading some posts on here I'm tempted, but I don't a discussion of the pros and cons here, but would it help in this case? if yes why?
Anyway over to you my learned friends.
Thanks
Called out yesterday morning client has 2 x Wylex Boards with MCB's each has a 63Amp, 100Ma RCCB as the main switch on a TT System.
Board 'A' is the main 24hr feed for the house, Sockets., Lights etc 8 circuits
Board 'B' is the economy 7 night storage heaters. feeding 7 circuits. Midnight to 7am
A Smart meter has been installed recently, where the neutral is split to feed both boards and of course the 2 live feeds. No issue there I think?
Problem they have had for at least 12 months they tell me, happens more in the winter months, is intermittent tripping on the Board 'B' RCCB when it is not energised.
Most recently one afternoon when they put the kettle on and then a small table light, the lamp blew, which they do, only it tripped the Board 'B' RCCB
OK Live - Neutral imbalance due to the lamp blowing but why Board 'B' and not 'A'
Both Boards are 20+ years old and have a cupboard built around them so getting access to the circuits is difficult without destroying the cupboard.
All I have done is RCD tested x1= 17.3 x5 = 5.0 (I know not a requirement but meter does it) Ramp test at 85Ms. BOTH Boards tripping at the same time during these tests. Should They?
PFC 0.48Ka & 0.47 Ohms at a kitchen socket very close to the boards.
So before I remove the cupboard and make a mess to start IR all the circuits etc. does the panel think its a weak RCCB on Board 'B'?
Board 'B' still live somehow?
I don't have a Earth Leakage Clamp Meter, but reading some posts on here I'm tempted, but I don't a discussion of the pros and cons here, but would it help in this case? if yes why?
Anyway over to you my learned friends.
Thanks