"Andy Wade" wrote in message
...
Sparks wrote:


I assume this is because the house does not have a split load CU....yet!

It's not split-load, but you said it did have an RCD - so there are two 30
mA RCDs in cascade to the tub. An earth fault at the tub could trip
either or both RCDs and, by the sound of it, possibly black out half the
house. This is a violation of Regulations 314-01-01 and 314-01-02 of BS
7671. If there is an intention to convert the relevant house CU to
split-load, with the tub feed on the non-RCD side then there is some logic
to what's been done.

[big snip]

The plan is to deck all around the tub wit hwooden decking.
Does this change anything, as it will them be impossible to have one foot
on the actual ground and another part of the body in the tub.

In principle no, I still think it needs to be converted to a local TT
system by isolating the exported earth. Outdoors things like the concrete
base and wooden decking could well be conductive enough to allow dangerous
shock current to flow. But maybe you don't need to be quite so anal about
the earth system as I suggested at first, if there really are no
exposed-conductive-parts. A good single earth rod somewhere near the tub
is probably adequate.


This may sound a silly question but; if the pump is double insulated, the
tub and pipework are plastic, what's the earth rod going to be attached to?