Ring Main loading

[sparky692]

Hiya guys . have recently run a new ring in to a new kitchen . Not yet second fixed it . Done it as per plan.. It is now apparent that the microwave now is a Microwave /oven combo with a total load of kW. Never hard this but the kitchen guy says the new regs state that anything with a load of over 2kw has to be on its own radial. anyone heard of this . cos i haven't.
Will state only other appliance on this ring is a dishwasher, straight 13amp plug on it.there is a utility with its own ring for the other appliances .Washing machine etc. There isn't a electric kettle as such, as its a Stoves gas kettle. .
Any one throw some light on this ?
Thanks


Sparky 692

 

[Guest112]

how many kw?

its in appendix 15 at the back

 

[Octopus]

Ask the "kitchen guy" which reg he is refering to as I doubt he'll know as it doesn't exist.

 

[sparky692]

He is saying that ANY appliance with a loading of 2kw or over must have its own supply(radial ) from the CCU. Therefore Dishwashers washing machines even some kettles, surely not ?

 

[Octopus]

As I said ask him which reg he is referring to. Now if the kitchen has a large water heater/oven/inductive hob he may have a point but radials for washing machines!!

Mind you, if the customer is willing to pay for your extra time and all the extra parts, then who's to argue

 

[Guest112]

its not a specific reg havent got my books on me but its on the ring diagram as a recommendation in app 15 get the book out mate

 

[sparky692]

Absolutely . why bother with rings. just have a massive CCu and put in radials to everything ... LOL. think thats answered that one. Ill look in Appendix 15 but have got my regs book with me . thanks

 

[Dan23584]

It is in there, only says cookers, ovens and hobs exceeding 2kw, its comes across as more a recommendation for keeping high current usage over long periods of time on the ring circuit. It may be worth considering depending on you load situation.

 

[rdelectrical]

you can buy 2kw heaters with a 13 amp plug on them that plug into the ring main so i think you will be ok to leave on ring main

 

[sparky692]

Thanks Dan and all for your answers. End of the day . common sense prevails. Thanks again

 

[DaveyD]

He's got the guide to Part P. 4.2.1 RFC. "Ring circuits shoud not supply immersion heaters, comprehensive space heating, ovens and hobs with a load exceeding 2kW or similar loads."

Not saying its a reg ..... just saying ...

 

[Sintra]

Haven't got the BRB with me so could be wrong but i think there might be something in 433.1.5 or thereabouts.

Somebody shoot me please.

 

[DaveyD]

Haven't got the BRB with me so could be wrong but i think there might be something in 433.1.5 or thereabouts.

Somebody shoot me please.

Smart :biggrin5:
Appendix 15 (as already stated by smart others) has info. States there that 433.1.5 can generally be acheived by .... sharing etc and 'connecting ...exceeding 2kW on their own dedicated radial circuit'
Soooo these appendix's are for information.

 

[Engineer54]

Depends surely on what sized conductors you have used for you RFC!! If your using 4mm then no need to worry about 2KW loads. There can be more than one or two appliances in a kitchen, with a KW of more than 2KW, most electric heaters are over 2KW . I've been wiring RFC with 4mm conductors for years now, even had my house RFC's all wired in 4mm with 2.5 CPC (singles as t's all conduited throughout).

 

[Knobhead]

2.5 CPC? Isn’t you’re conduit good enough then?
Come on you should have expected me to jump on that one!
For gods sake don’t tell me it’s in plastic conduit.

Sorry kid.

 

[Knobhead]

I’ve got to admit I’d love to do a full house in conduit or MICC.
And before anyone says anything, no I wouldn’t use 20A metal clad isolators for the light switches!

 

[Engineer54]

2.5 CPC? Isn’t you’re conduit good enough then?
Come on you should have expected me to jump on that one!
For gods sake don’t tell me it’s in plastic conduit.

Sorry kid.

It IS PVC conduit mate, typical house bashing stuff in Cyprus. They can't use T&E in housing over there, 99% of all housing is concrete frame with block fill-in and concrete floors/ceilings. Normally they use 16 mm conduit for lighting, but i spec'd 20mm throughout in my 2 properties.

EDIT .... Seen a couple of older properties over there where they had used black conduit. Well what was left of it. They didn't use to slab water proofing in the old days, and both properties had, had an ongoing slow leak on the pipework around the bathroom area's. Literary totally destroyed the conduit system in the screeds on the ground floor....

 

[Silly Sausage]

I’ve got to admit I’d love to do a full house in conduit

I did my house in conduit, PVC, wasn't going to try and get 20mm metal tubes through holes in joists!

 

[Engineer54]

I did my house in conduit, PVC, wasn't going to try and get 20mm metal tubes through holes in joists!

I wouldn't even try getting PVC conduit through holes in joists, i'd do as the plumbers and heating guys do and slot the joists.

I'll wait for the flack now, from all those younger guy's that believe the crap about where, what and when you can drill holes or slot !! And that think your going to weaken joists to the point of collapse... lol!!

Funny how all the millions of houses over the years, survived with literary no such building Reg's!! Mind you, joists ''Where'' real joists in the past!!!

 

[Knobhead]

Water leaching through concrete is highly alkaline so no it wouldn’t last very long. At times when working in the quarries you ended up more a stone mason trying to get in to conduit boxes. After a couple of years your nice conduit runs had stalactites growing from them.

 

[Knobhead]

I wouldn't even try getting PVC conduit through holes in joists, i'd do as the plumbers and heating guys do and slot the joists.

I'll wait for the flack now, from all those younger guy's that believe the crap about where, what and when you can drill holes or slot !! And that think your going to weaken joists to the point of collapse... lol!!

Funny how all the millions of houses over the years, survived with literary no such building Reg's!! Mind you, joists ''Where'' real joists in the past!!!

They were built with decent timbers, not match sticks.
And I’m with you I’d slot a 8” joist quite happily.