What is maximum number of 13A Sockets on a Ring Main?

[carryoncamping]

I'm about to wire my extension, which has three rooms. So I was wondering whether to have two ring mains or just one. There'll probably be about 5 or 6 double sockets per room Total floor area is 34m^2.

What is an acceptable maximum number of 13A double sockets on a single Ring Main, using 2.5mm cable, please?

Cheers

 

[Taylortwocities]

There is no maximum number. A designer will look at the demand and design the installation depending on the loads.

The IEE's On Site Guide (note the word guide) says that a ring can serve a floor area not exceeding 100m².

 

[Adam_151]

To add to what TTC wrote:

What rooms are in the extension?

If bedrooms, then it shouldn't be a problem to use a single RFC, if you have a kitchen, utility room, garage, etc, then these are best on their own ring finals due to heavy loading

 

[carryoncamping]

To add to what TTC wrote:

What rooms are in the extension?

Bedroom, Dining Room and Computer room. The latter will draw the most I'd imagine.

 

[JohnD]

no it won't. computers are weedy little things using few amps.

appliances that use a lot of power are fan heaters, ovens, water heaters, washing machines, tumble driers.

 

[GaryMo]

John, do you have fan heaters, ovens, water heaters, washing machines and tumble dryers in your bedroom and dining room?

I think he's right, his computer room will probably draw the most out of the three rooms.

 

[carryoncamping]

no it won't. computers are weedy little things using few amps.

appliances that use a lot of power are fan heaters, ovens, water heaters, washing machines, tumble driers.

Thankfully, I won't using any of the above appliances in the bedroom or Dining room. Perhaps a clock radio, occasional vacuum cleaner etc, maybe.

 

[JohnD]

they're all trivial loads

hardly worth installing a new RFC for them.

 

[plugwash]

no it won't. computers are weedy little things using few amps.

still it can add up, especially if you have say a full rack of fast computers.

 

[megawatt]

I agree, the OP has called it a computer room rather than an office which may suggest that he has lots of kit including UPS's etc.

It does all add up and, if it is a large installation the kit could be on all the time.

I'm in a similar situation and I have installed a dedicated 32A radial to my office on the non-rcd side in the CU (installation is TT with 100mA TD on the non-32mA RCD side).

We get fairly regular power outages where I live and hence the need for UPS.

The wife asked if I could put the Sky, TV in the bedroom and her hair straighteners on the UPS last time the power went out ... Priceless

MW

 

[Softus]

they're all trivial loads

hardly worth installing a new RFC for them.

It is if you put that RFC on an RCBO, such that those nuisance trips from cooker/freezer etc. don't take out the computers in the middle of updating that bikini-waxing client database.