MK Masterseal SFCU - ok for lighting drop off RCBO'd outside 20A radial

[js.b1]

We have a 27ft long dark wall, no road or adjoining lighting. I would like to fit an external downlight & PIR.

Nearby exists a MK Masterseal socket outlet on a 20A external radial to an outbuilding, RCBO protected. Above ground it is HiTuf changing to SWA to enter ground.

I could fit an MK Masterseal SFCU 56410 alongside the socket, creating a fused spur at 3A, w/double pole switch.

Q: Is that a legitimate usage of the SFCU 56410?

This would avoid running another cable alongside the existing. I suspect it is considering likely popular for fountains & such.

Struggled in the dark for donkeys years and just stumbled across the item in the MK catalog p206, guide #46 :-)

-- JSB.

[Owain]

Wihtout looking at the part (because I'm offline) the circuit configuration sounds acceptable.

With that length of wall, several lower-powered lights and PIRs might provide better coverage. Most types (but not all) if you interlink them with 4-core cable (live, switched live, neutral, earth) in parallel, any PIR sensing movement will trigger all the lights.

Owain

[js.b1]

Great. I have bought a Masterseal SFCU and it works ok. Using the black pond rubber cable left over from a TLC order.

Noted, and thanks.

-- JSB.

[Lurch]

On 28 Feb 2007 06:10:48 -0800, [e-mail] mused:

You're not meant to use flex for fixed wiring.

[js.b1]

Even for the SFCU to light drip-loop?

Cable to the Masterseal-SFCU with be HiTuf or SWA or Singles in black heavy-duty conduit (I have all spare).

Cable from Masterseal-SFCU to Light drip-loop would be about 9-12-inches black ?TRF07? rubber from TLC.

HiTuf will not fit into a light fitting. PVC FTE is not well regarded in OSG re UV protection. Pyro would be horribly expensive as I lack the tools. FireTuff is not a flex (solid-core), is silicone (high temp), and most probably UV rated (re stricter fire code needs).

Would it be better to use white 2-core-w/CPC FireTuff? It's only about =A31 a metre so would only be =A31-2 at most.

Thanks.

-- JSB.

[Lurch]

On 1 Mar 2007 05:51:26 -0800, [e-mail] mused:

Right, I read it as you were going to run the flex a reasonable distance across\up\down a wall to the light from the socket location.

As you were then. ;)

[js.b1]

That's great, thanks :)

-- JSB.

[Andrew Gabriel]

There is no such rule I'm aware of. It's usually not convenient or appropriate to do so for a number of reasons, but it's not forbidden.