power in loft

17 Jan 2004
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United Kingdom
The previous occupant of my house (1990s-built) installed power in the loft to run a few lights and a double socket for a TV signal booster plus external security lights.
The power source is a spur from an immersion heater switch in the airing cupboard, via a fused connection unit in the airing cupboard; there's then another FCU in the loft before the cable runs to the light switch and power socket. All cable is standard 2.5mm.
The immersion heater is run from a 16A circuit; there's nothing else connected to this circuit. The immersion heater is rarely used.

It all looks like a decent job to me, but I just want to check the wisdom/safety of taking the spur from the immersion heater circuit - is this okay, or should it be a spur from an ordinary ring circuit (which my fusebox tells me is rated at 32A)?
Also, what fuses should I put in the FCUs?

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the loft should be on the LOAD side of the cupboard fcu

fuse size depends on what you are going to connect to fcu
Thanks breezer

Yep, just checked - loft is on the load side of the cupboard FCU.
So is it okay for the spur to come from the immersion heater switch?

I'll be running a TV signal booster and a couple of 500W external security lights wired via a junction box into a standard 3-pin plug, into the existing socket.
Plus 4x60W lightbulbs when I'm up there (don't like dark spaces!)
i would opt for flourescent lights, brighter and more even light
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Fair enough ... but what about the fuse rating for the FCU serving 4x60W bulbs, a TV signal booster and a couple of 500W security lights?
yeah a 5A for the security lights

and a seperate 3A for everything else

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