Swimming pool renovation has included replacing the deck box that connects to a (new) LED light in the pool. The light is - as before - 12v, fed from a transformer in the plant shed.
As you'd expect, the cable from the light to the deck box is two core, ie no earth. Surprisingly (to me) the armoured cable coming to the deck box from the transformer was 3 core (ie with earth). I think that's because the existing (original) transformer is not double insulated and has 3 cores in and 3 cores out, the earth on the lamp side presumably being terminated at the deck box (had been removed and disposed of, along with the old lamp, so can't be sure).
So - I've bought a new transformer recommended for the new lamp and deck box. It's double insulated and so has just two connections (no earth) in and out. Presumably the existing 3 core armoured cable can stay in situ (I certainly hope so, it's now buried under concrete and expensively completed new paving) and the earth core not connected (or capped safely) at either end.
On the supply side to the transformer, there's currently a 3 core 240v supply from a fused spur into the existing transformer. The new transformer is not expecting an earth wire and has nowhere to connect the earth. Is the solution to a) find a new fused spur that has a termination for the earth and only two cores out to the transformer or b) take the output from the spur to a new JB inside which I cap off the earth into a block or wago and run two cores from that to the transformer?
As you'd expect, the cable from the light to the deck box is two core, ie no earth. Surprisingly (to me) the armoured cable coming to the deck box from the transformer was 3 core (ie with earth). I think that's because the existing (original) transformer is not double insulated and has 3 cores in and 3 cores out, the earth on the lamp side presumably being terminated at the deck box (had been removed and disposed of, along with the old lamp, so can't be sure).
So - I've bought a new transformer recommended for the new lamp and deck box. It's double insulated and so has just two connections (no earth) in and out. Presumably the existing 3 core armoured cable can stay in situ (I certainly hope so, it's now buried under concrete and expensively completed new paving) and the earth core not connected (or capped safely) at either end.
On the supply side to the transformer, there's currently a 3 core 240v supply from a fused spur into the existing transformer. The new transformer is not expecting an earth wire and has nowhere to connect the earth. Is the solution to a) find a new fused spur that has a termination for the earth and only two cores out to the transformer or b) take the output from the spur to a new JB inside which I cap off the earth into a block or wago and run two cores from that to the transformer?