Had a callout today to see a couple with concerns about the electrics to a hot tub / spa at house they've just bought this year.
They were concerned as hot tub has only a small flex attached to a 13A plug top and were pointing out a socket fitted on garden wall too.
So socket is an MK masterseal single but no switch or rcd incorporated, fed via a hanging through garage blockwork hole on a 1.0mm twin and earth flat PVC cable with no clips or protection from the elements and spurred from a fused connection unit supply side not load which also feeds boiler, motorised valve and associated timeswitch etc.. that is fed via a metal clad 2 gang socket fed from what seems is 1st floor ring final circuit via a single flat twin 2.5mm cable from house through wood boxing to seperate garage ! Socket in garage also feeds washing machine and fibre service O.N.T. then just to add insult to it all the boiler pipe earth clamps are connected via a 6mm single earth shoved into metal clad socket earth terminal with the single cpc core feeding from the house and also the cpc from the fused spur which is spurred from the first socket.
Board is old 3036 with plug in 3871's in it now. I'm trying to look into the hot tub itself as it's a strange looking bit of kit and while telling them we should remove outdoor socket and teeny 1mm twin for a start then I checked Zs from metal clad socket and that was o.k. under the 0.87 max at 80% at 0.58 ohms but the bonding clamps back to board earth terminal with an R2 wander lead was above the result to need supplementary bonding. A proper mess. Customer doesn't want to start running more bonding due to cost and route etc.. but really the single 2.5mm feeding whole lot is in need of sorting anyway. Thoughts please?
Cheers.
They were concerned as hot tub has only a small flex attached to a 13A plug top and were pointing out a socket fitted on garden wall too.
So socket is an MK masterseal single but no switch or rcd incorporated, fed via a hanging through garage blockwork hole on a 1.0mm twin and earth flat PVC cable with no clips or protection from the elements and spurred from a fused connection unit supply side not load which also feeds boiler, motorised valve and associated timeswitch etc.. that is fed via a metal clad 2 gang socket fed from what seems is 1st floor ring final circuit via a single flat twin 2.5mm cable from house through wood boxing to seperate garage ! Socket in garage also feeds washing machine and fibre service O.N.T. then just to add insult to it all the boiler pipe earth clamps are connected via a 6mm single earth shoved into metal clad socket earth terminal with the single cpc core feeding from the house and also the cpc from the fused spur which is spurred from the first socket.
Board is old 3036 with plug in 3871's in it now. I'm trying to look into the hot tub itself as it's a strange looking bit of kit and while telling them we should remove outdoor socket and teeny 1mm twin for a start then I checked Zs from metal clad socket and that was o.k. under the 0.87 max at 80% at 0.58 ohms but the bonding clamps back to board earth terminal with an R2 wander lead was above the result to need supplementary bonding. A proper mess. Customer doesn't want to start running more bonding due to cost and route etc.. but really the single 2.5mm feeding whole lot is in need of sorting anyway. Thoughts please?
Cheers.
