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- 19 Feb 2006
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Evening folks,
Have been asked to look into a job today where the RCD trips for no apperent reason and im stuck as to why.
Installation is a seperate 80A 30mA RCD supplying an old wylex board with 4 circuits protected by 3871 cbs.
Circuits are downstairs ring 30A, Upstairs ring 30A, Down stairs lights 5A and uP stairs lights 5amp
Sytem is PME with correct main bonding etc.(ze 0.12)
On testing the circuits found the down ring to be O/C end to end on the neutral so in the process of tracking that down(still trips erratically with the circuit isolated) other than that end to end and R1+R2 come back with values of around 0.3 for the rings and 0.6 for the lights.
All IR checks are full scale on my robin so everything good there.
Polarities are correct and zs values are well within the required limits.
Rcd works on manual test and with the tester.
Everthing seems ok all switches etc function correctly but cant work out why the RCD trips so eratically,
Any suggestions(have swapped the RCD for one in van and that one does it as well)
Lee.
Have been asked to look into a job today where the RCD trips for no apperent reason and im stuck as to why.
Installation is a seperate 80A 30mA RCD supplying an old wylex board with 4 circuits protected by 3871 cbs.
Circuits are downstairs ring 30A, Upstairs ring 30A, Down stairs lights 5A and uP stairs lights 5amp
Sytem is PME with correct main bonding etc.(ze 0.12)
On testing the circuits found the down ring to be O/C end to end on the neutral so in the process of tracking that down(still trips erratically with the circuit isolated) other than that end to end and R1+R2 come back with values of around 0.3 for the rings and 0.6 for the lights.
All IR checks are full scale on my robin so everything good there.
Polarities are correct and zs values are well within the required limits.
Rcd works on manual test and with the tester.
Everthing seems ok all switches etc function correctly but cant work out why the RCD trips so eratically,
Any suggestions(have swapped the RCD for one in van and that one does it as well)
Lee.