RCD tripped. narrowed down to SWA feeding hot tub. never seen SWA connected like this before. armour not earthed anywhere. was supposedly professionally installed. the pic shows a 30mA plug-in power breaker RCD, the type you'd fit to a lawn mower cable!
![[ElectriciansForums.net] today's fault](https://electricians.s3.eu-west-1.amazonaws.com/data/attachments/7/7410-a4d77ed6539acc70b75f182ad0378322.jpg "[ElectriciansForums.net] today's fault")
disconnected both ends and IR tested SWA . L/E 0.04 Meg. N/E 0.23 Meg. 40m of SWA, partly buried. half way down had been repaired? with choc block and tape.
so , it's quote for new SWA, glands, ad. box, correct installation. what i'm not happy with is that it's fed from the garage sub-main which is in turn fed from the house RCD in a split board, so a fault will take out all in the house except lighting. now, i've not done any work on hot tubs, but my thinking is to feed the garage sub. from the non protected side of the house ( it's fed in SWA ) and then fit RCBO in the sub. to cover the garage socket ( just a fridge/freezer) and a 13A FCU to feed the SWA to the hot tub. anyone see a flaw in this? worked out the VD at 13A to be 9.5V using 40m of 2.5mm SWA.
disconnected both ends and IR tested SWA . L/E 0.04 Meg. N/E 0.23 Meg. 40m of SWA, partly buried. half way down had been repaired? with choc block and tape.
so , it's quote for new SWA, glands, ad. box, correct installation. what i'm not happy with is that it's fed from the garage sub-main which is in turn fed from the house RCD in a split board, so a fault will take out all in the house except lighting. now, i've not done any work on hot tubs, but my thinking is to feed the garage sub. from the non protected side of the house ( it's fed in SWA ) and then fit RCBO in the sub. to cover the garage socket ( just a fridge/freezer) and a 13A FCU to feed the SWA to the hot tub. anyone see a flaw in this? worked out the VD at 13A to be 9.5V using 40m of 2.5mm SWA.
