We have a Crabtree CU (split load with RCD and SB6000 MCBSs). We have had issues with certain high powered items intermittently tripping the RCD on different circuits. ie a compressor in the garage.. Fridge on the downstairs ring main and more recently a spur that goes outside for a hot tub. All installed before we moved in and the spur to the hottub is 6mm SWA cable and appears to be bonded correctly. My question is - should you be able to reset the RCD with the MCBs switched to on? The only way I can ever reset it is to either turn off the main switch, reset the rcd and then turn back on, or switch each one of the RCD MCBS off and then turn them back on individually. It doesn't trip again for a while doing this and can last for a month or so. Cheers. Andy.
How to reset an RCD on a CU
- Thread starter clarkerz
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That is quite normal. Each item will have a small leakage to earth and all combined is too close to limit to reset. Also found resetting one RCD of pair can trip second.
If the RCD tripping is becoming more and more of an issue then consider moving a couple of circuits to the unprotected side of the CU and using RCBOs instead (assuming you have a split load board and spare ways on the board).
It will avoid the possible scenario of coming home from holiday to find your freezer has defrosted.
It will avoid the possible scenario of coming home from holiday to find your freezer has defrosted.
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The use of RCBO's has been talked about many times. Although the more you split circuits the less chance there is that they will trip it also increases the chance you will not notice if it does.
When my lights go out I know the RCD needs resetting. There are auto resetting types but at £250 each you need to loss a few freezers full to pay for themselves. I have run with two RCD's covering whole house since about 1990 and not lost a freezer full of food yet.
When my lights go out I know the RCD needs resetting. There are auto resetting types but at £250 each you need to loss a few freezers full to pay for themselves. I have run with two RCD's covering whole house since about 1990 and not lost a freezer full of food yet.
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I've never found an RCBO for a SB6000 series board.
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