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- 13 Dec 2006
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Hello!
Having just moved to a new house and finding an old wylex push button CU, I decided to change it for a new one with RCD.
Disconnected old CU and connected new one no problem, but the RCD keeps tripping instantly.
Having tried all the different circuits in the house:
Up Lighting
Down lighting
Cooker main
Shower
Ring circuit
all show the same symptom, trip straight away.
Having disconnected every thing from each circuit the RCD will stay on, until any circuit has any load put through it. e.g. Shower switched on, Cooker switched on, anything plugged into a socket and switched on.
So decided RCD must be faulty and changed RCD from a contactum to a squareD. However this still gave the same result.
Perhaps all the cables leading from the CU had become damaged (Checked for resistance and continuity : these are all OK), however I replaced the cable to cooker and still same result.
I have noticed the test switch on both RCD's do not work. Could both RCD's be faulty, both brand new and never been used?
Do the test switches only work when a load is passed through them?
I have an TN-S earthing system would this cause a problem?
Thank you for your help.
Having just moved to a new house and finding an old wylex push button CU, I decided to change it for a new one with RCD.
Disconnected old CU and connected new one no problem, but the RCD keeps tripping instantly.
Having tried all the different circuits in the house:
Up Lighting
Down lighting
Cooker main
Shower
Ring circuit
all show the same symptom, trip straight away.
Having disconnected every thing from each circuit the RCD will stay on, until any circuit has any load put through it. e.g. Shower switched on, Cooker switched on, anything plugged into a socket and switched on.
So decided RCD must be faulty and changed RCD from a contactum to a squareD. However this still gave the same result.
Perhaps all the cables leading from the CU had become damaged (Checked for resistance and continuity : these are all OK), however I replaced the cable to cooker and still same result.
I have noticed the test switch on both RCD's do not work. Could both RCD's be faulty, both brand new and never been used?
Do the test switches only work when a load is passed through them?
I have an TN-S earthing system would this cause a problem?
Thank you for your help.