Cables size for a Worcester Greenstar 30 CDi combi boiler

[daz134]

I have a 30KW boiler.

Its a Worcester Greenstar 30 CDi Condensing Combi Boiler and i need to put a feed to it.

Its a cable run of about 1 meter to 1 meter and a half and it will be going into a fused spur.

Please can you tell me what size heat resistant flex i would need to complete this to the regs please

thanks

 

[kevindgas]

try the MI's or post up what boiler you have otherwise we are peeing in the wind so to speak

 

[daz134]

Thanks for the advice

its a Worcester Greenstar 30 CDi Condensing Combi Boiler

 

[kevindgas]

1.5 twin and earth will be fine.
what protection will you have other than the fused spur?
you may like to fit a 30Ma rcd switch instead if your consumer unit is old they are about £25 from screwfix.

 

[daz134]

Its a brand new RCD fuse box.

Should i use more protection. I was told by some one that the new boilers can even be used of a 13 amp plug at times.

I have a fused spur that use to power the old boiler. So i thought i would put it in that. It says in the manual about a 3pole switch, but i figured the spur would be enough.

So should i not get a flex instead as it would look better than ugly twin and earth.

I thought i would need a heat proof flex is that not correct

 

[kevindgas]

sorry daz you misunderstood me twin & earth flex is what i meant doesn't have to be heat resistant as the boiler won't get that hot.
the fuse board sounds up to date so a fused spur fitted with a 3 amp fuse should be fine.

 

[daz134]

Excellent thanks so much for your help

So i will go and get some 1.5mm Flex and use it with the spur.

So i dont need to get heat resistant then. I could use standard flex??

 

[kevindgas]

yes it will be fine

 

[davelx]

yes it will be fine

Certainly will - that's how mines wired (same boiler)

 

[Click-Sure]

Personally I wouldn't use anything other than Heat Resistant for this purpose, its not like its a lot more expensive.

 

[Steve]

Gas or oil boilers of any variety have always been wired in flex from a 3 amp fuse, either plugged in or wired to a fused spur. A fused spur is a 2 pole switch (MI's should not require a 3 pole switch - these are for fans where there are two lives).

The 30kw is its GAS energy rating. Its electric rating will probably be 200 watts or less - thats as much as your plasma/lcd tv.

And its a myth that they require heat resistant. They dont, though some may specify it. As long as its not touching any hot pipes, its fine. The heat from the fuel is directed solely at the heat exchanger and out the flue. The case of the boiler is well ventilated.

 

[kirkgas]

0.75mm2 heat resistant flex for boilers