Two 2kW convection heater on ring final?

[redlitchfield]

Hi,

I am about to refurbish two attached outbuildings for an old colleague as he wants to use them for his music teaching (one room for teaching space and one for parents waiting room). After deciding it would be too expensive to extend his central heating radiator feeds we have settled on having one wall mounted convection heater (2kW) per room. Each room is 2.4x4.5m.

I'm putting in a dedicated ring for the two rooms and each room will have four sockets in. The way the ring will be run into the rooms from the consumer unit and the heater positions work out that the two heaters are evenly spaced on the ring (9 and 3 o'clock if you imagine a clock face).

Now, the regs mention about "comprehensive electric space heating" not being connected to a ring. I just wondered how 'comprehensive' has been interpreted in the past with regards to the feasibility of the above?

Giving them their own supply is an option but will incur more cost/work/different cu, just thought I'd ask before I break him the good news.

Any thoughts would be much appreciated.

 

[amlu]

which regs say no to heaters on the ring?

2kW you looking at a 9amps current draw each, will be 18 amps for 2 of them, they will be fine on a 32A ring.

 

[redlitchfield]

It doesn't say no, it's just talking about exceeding current carrying capacity for long periods and how to avoid it. It's the ring final diagram here; Appendix 15, Fig 15A, (ii)

It's illustrating 433.1.103

I need to enquire what he intends to plug in to the ring, mainly PC and hifi in the teaching room and perhaps eventually a TV in the waiting room. I also need to find out if he intends to use his valve guitar amp as they can be quite juicy.

Thanks.

 

[Guest55]

i bet all his other loads on the ring wont exceed 10A considering the intended use so crack on.
;-)

 

[telectrix]

classic case of over thinking. just do it.

- - - Updated - - -

classic case of over thinking. just do it.

 

[Engineer54]

It doesn't say no, it's just talking about exceeding current carrying capacity for long periods and how to avoid it. It's the ring final diagram here; Appendix 15, Fig 15A, (ii)

It's illustrating 433.1.103

I need to enquire what he intends to plug in to the ring, mainly PC and hifi in the teaching room and perhaps eventually a TV in the waiting room. I also need to find out if he intends to use his valve guitar amp as they can be quite juicy.

Thanks.

Have you been reading Mr Cockburns theories on small overloads for long periods by any chance?? lol!!

 

[redlitchfield]

It's just one of those cases where you think "is it belt and braces or a sledge hammer to crack a walnut?!"

I was thinking in future proofing terms because you just know I'll get a phone call in a months time saying he's put a kettle in the waiting room for the parents and his electric keeps tripping!

 

[Engineer54]

It's just one of those cases where you think "is it belt and braces or a sledge hammer to crack a walnut?!"

I was thinking in future proofing terms because you just know I'll get a phone call in a months time saying he's put a kettle in the waiting room for the parents and his electric keeps tripping!

This is almost a perfect example of what Mr Cockburn was worrying about!! The fact is, the circuit is perfectly adequate to absorb such short term overloading, and it's very unlikely that the protective devise will give nuisance tripping... lol!!


If it does, that's when you quote him for an additional circuit!! You can't future proof for every eventuality that a customer may or may not want to add in the future!!

 

[i=p/u]

Couple of 5ft tubular heaters in each room... But max it out .. Remember to add rubber washers between metals to stop vibrating

 

[Guest111]

You will be fine,the scenario you mention goes on in houses up and down the country every day,the main risk would be cables chaffing on those nasty round pipes. lol