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pjb1
Went to see a mate today who's a chippy has a smallholding on a farm. While standing there gassing about dirt bikes the Blokes who have the unit next to him. Seem to be having problems my mate being nosey asked what was up. Big mistake, The chap said their rccb kept tripping, Guess what was coming my mate’s points at me and says he's a sparky. Don't you just want to hit them when they open their mouths?
Anyway not being one to not offer to help if I can. Went and had a look. In the unit was a 40A 30m A 3phase RCCb which feed a 3 phase switched fused isolator. Feeding the 3 phase Rccb was a 4-core swa, the earthing conductor was a 10mm single terminated on the side of the switch fuse isolator. clipped and passed through the external wall to the earthing electrode sited in a pit.
The cause of there problem was, off the top of the 3 phase switch fuse they had a single phase supply feeding a cu which feed the lights and sockets. And when they plugged anything in, it was taking out the 3 phase Rccb.So they hade disconnect the consumer unit, And using those tails in connector block (Using this for a test purpose) used it as a direct feed for a belt sander, But switching on the sander still knocked out the 3 phase Rccb. Nothing at fault with the belt sander tested that else where.
I removed the tails to the top side of the Rccb giving it now a direct feed from the supply. Turned it on even though the belt sander was working, it still took out the Rccb? Checking all termination for loose connections looking for something that maybe causing a high resistance, all terminations checked out fine.
Anybody shed any light on this one?
Anyway not being one to not offer to help if I can. Went and had a look. In the unit was a 40A 30m A 3phase RCCb which feed a 3 phase switched fused isolator. Feeding the 3 phase Rccb was a 4-core swa, the earthing conductor was a 10mm single terminated on the side of the switch fuse isolator. clipped and passed through the external wall to the earthing electrode sited in a pit.
The cause of there problem was, off the top of the 3 phase switch fuse they had a single phase supply feeding a cu which feed the lights and sockets. And when they plugged anything in, it was taking out the 3 phase Rccb.So they hade disconnect the consumer unit, And using those tails in connector block (Using this for a test purpose) used it as a direct feed for a belt sander, But switching on the sander still knocked out the 3 phase Rccb. Nothing at fault with the belt sander tested that else where.
I removed the tails to the top side of the Rccb giving it now a direct feed from the supply. Turned it on even though the belt sander was working, it still took out the Rccb? Checking all termination for loose connections looking for something that maybe causing a high resistance, all terminations checked out fine.
Anybody shed any light on this one?
