Spur and lighting cct off a FCU protected spur?

[Pete E]

I am looking to install power and light into what was a "coal house" that is going to be used to hold a small domestic chest freezer.

The room itself is part of the fabric of the house, but is only accessible by an external door. The wiring run will be direct through the kitchen wall into the room itself ie no external wiring.

I have not looked at the existing wiring in detail yet, but it looks like there is a double socket (as part of the ringmain) with switched FCU protected spur leading to a socket below the kitchen work top that is for the washing machine.

Given this spur has an FCU already, can I simply run anotherspur off this socket into the coal house and fit a standard double socket with another FCU and a “spur”to feed a light?

I would use 2.5mm T&E for the power socket (less than a10 foot run) and then 1mm beyond the new FCU for the lighting part. I would then down rate the fuse in this light FCU to 3amp?

Would this be ok?

Thanks in advance,

Peter

 

[Pete E]

Given step daughters record with freezer being left uplugged , switched off, the lid left up, or a combination of these, the more fool proof the installation, the better!

 

[Flanders]

As long as its installed correctly and the freezer is not faulty then there should be no reason for the RCD to trip , My freezer is protected by and RCD as it I the socket circuit on the RCD side of my 16th addition board and never had a problem for the last 15 years ,In this case That fact that its an RCD socket will help as the only thing that's going to trip out the RCD is The freezer if it developes a fault and there for possible save the life of the person in using it.

 

[telectrix]

As long as its installed correctly and the freezer is not faulty then there should be no reason for the RCD to trip , My freezer is protected by and RCD as it I the socket circuit on the RCD side of my 16th addition board and never had a problem for the last 15 years ,In this case That fact that its an RCD socket will help as the only thing that's going to trip out the RCD is The freezer if it developes a fault and there for possible save the life of the person in using it.

not if he falls in it and the lid shuts, knocking him unconscious and unable to get out before freezing to death. :ciappa:

 

[Flanders]

not if he falls in it and the lid shuts, knocking him unconscious and unable to get out before freezing to death. :ciappa:

Sorry I stand correctly I forgot about that regulation:biggrinjester:

 

[sparksburnout]

Sorry I stand correctly I forgot about that regulation:biggrinjester:

whats the correct pose for standing correctly then? Chest out, shoulders back, corrected.

 

[sparky1508]

Not really 1 spur per socket on the Ring Final Circuit (RFC)

Agreed, one spur only per socket and the socket off the FCU is a spur. If you have a double socket on the same wall you might get away with spurring from that to a socket for the freezer the fuse down to 3 amps for your light but even that is another spur off a spur in my opinion.[emoji50]

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[Adam W]

If a large freezer is going on the circuit I'd want to keep it as simple as possible to reduce the likelihood of tripping, not stick a bit of everything on it. Presumably you don't want the freezer defrosting every time a light bulb blows?

 

[sparksburnout]

OMG how to make a mountain out of a molehill or what! You CAN have more than one socket off a FUSED spur, this poor OP must wonder what the hell he has asked here, god knows how some of you guys carry on when you get in front of a customer, it's just a freezer not an aluminium smelter. Just take a feed off the existing FCU and run it to either a socket if there is an RCD covering the circuit or if not into another cable fed FCU so there is no socket involved.

 

[davesparks]

This thread is hilarious!

A little common sense would suggest that spurring off from the socket installed specifically as an appliance supply for the washing machine is not the most sensible option, especially not when the ring final is already local to that point.

Freezers, much to the surprise of some people I think, are not incredibly delicate and fragile appliances. They don't spontaneously trip RCDs for no reason, unless they develop a fault, and the local light blowing a lamp won't be a major issue as that will only happen when someone is there to notice and fix it.




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[davesparks]

Not that I aware of, but will need to check properly.. Would an RCD be requirement/Good idea? I could fit an RCD protected socket in outhouse if required?

Please tell me you are joking? If you don't know this then you are clearly not competent to be doing this job.
You could be placing the poor unsuspecting homeowner's life at risk through your incompetence, please just advise them to get an electrician who won't place their life at risk and then walk away from the job.

Electricity kills within a fraction of a second and you certainly don't get a second chance.


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[sparky1508]

BS 7671 states on page 453 appendix 15. Spur using an FCU connected directly to the ring.
The number of socket outlets supplied from a fused connection unit is dependent upon the load characteristics having taken diversity into account. It also shows conductor size reduced to 1.5mm2. If it's a single socket below the work top and it's going to be a single socket for freezer then it's just the light to add on the end. Just another DP switched FCU down to 3 amps and there you have it.

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[davesparks]

BS 7671 states on page 453 appendix 15. Spur using an FCU connected directly to the ring.
The number of socket outlets supplied from a fused connection unit is dependent upon the load characteristics having taken diversity into account. It also shows conductor size reduced to 1.5mm2. If it's a single socket below the work top and it's going to be a single socket for freezer then it's just the light to add on the end. Just another DP switched FCU down to 3 amps and there you have it.

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Yes, there's no disputing the regulations on this, just the common sense angle. The OP has stated that the existing socket after the sfcu is the supply to the washing machine. So any further sockets added to this will all be switched off whenever the washing machine is switched off, not a sensible design, especially when the ring is obviously also local to connect to.





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[sparksburnout]

All this nonsense is because we are trying to advise a DIYer how to bodge something up. Dave, I wasn't inferring that freezers are likely to trip an RCD, it was the fact that something else on the same RCD protected circuit might and take the freezer with it. I think this just goes to show that the only sensible advice would be for the guy to get a sparky in to do it properly. Incidentally, do any of you run your freezers on a dedicated or non-RCD supply? I do!

 

[Spoon]

do any of you run your freezers on a dedicated or non-RCD supply? I do!

Nope. I just have a 16th CU. 1 RCD, hardly ever trips, unless the daughter spills her drink down the back of something onto a socket...

 

[Flanders]

Yes, there's no disputing the regulations on this, just the common sense angle. The OP has stated that the existing socket after the sfcu is the supply to the washing machine. So any further sockets added to this will all be switched off whenever the washing machine is switched off, not a sensible design, especially when the ring is obviously also local to connect to.







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I agree and its what I said in post #8