fused spurs

[joni os]

My missus been threating diversity for years.

 

[ShaunCorbs]

My missus been threating diversity for years.

😀 keep with it im sure she will come round one of these days 🙂

 

[stani]

nope always use 1.5mm for boilers

0.75mm is more than big enough for a boiler, it's rated at 6 amp capacity

 

[stratplus]

No, the 15amp protects the circuit the 3amp protects the appliance fitted, in this case the boiler

Always thought the fuse was there to protect the cable so the fuse melts before the cable.

 

[ShaunCorbs]

0.75mm is more than big enough for a boiler, it's rated at 6 amp capacity

yea doesnt mean i agree with it

 

[stani]

Always thought the fuse was there to protect the cable so the fuse melts before the cable.

As above thought the 1.5 was t&e to the spur not from the spur to the appliance, you are right,

 

[stratplus]

Sorry, I thought the 1.5mm was also t&e, 1.5mm flex is very big for a boiler,

Was t+e to the boiler.

 

[ShaunCorbs]

Was t+e

why would you use t+e from a fused spur to a boiler

 

[stani]

So have you taken 1.5t&e into the boiler

 

[Best]

Cables are often oversized. I never use any heavier cable to a boiler than 1.0mm and that is more than plenty.
Fuses are for protecting cable to appliance and, perhaps slightly less importantly, the appliance itself.

 

[MOSSEP]

Always thought the fuse was there to protect the cable so the fuse melts before the cable.

Correct, the appliance has its own protection - a boiler for example usually has a terminal block with its own fuse in it.

 

[Best]

T&E cable from a spur to a boiler is fine, providing you use a wiring box, or another spur to take white 3 core round cable into boiler

 

[stratplus]

So have you taken 1.5t&e into the boiler

I havent done anything, this is just one ive came across that has got me thinking. But yes t+e into boiler. Mi's say at least 0.75mm pvc insulated cable....dosent say you have to use flex.

 

[MOSSEP]

To throw a spanner the works, you could feed an FCU with a run of 1.5mm t+e clipped direct from the consumer unit and protect it with a 16A 60898.

 

[ShaunCorbs]

I havent done anything, this is just one ive came across that has got me thinking. But yes t+e into boiler. Mi's say at least 0.75mm pvc insulated cable....dosent say you have to use flex.

dude it sounds like your out of your depth, from the fused spur to the boiler use flex looks much better and you wont have any problems with the glands on the boiler

 

[stani]

I havent done anything, this is just one ive came across that has got me thinking. But yes t+e into boiler. Mi's say at least 0.75mm pvc insulated cable....dosent say you have to use flex.

That's because they don't make 0.75mm flat t&e

 

[stratplus]

To throw a spanner the works, you could feed an FCU with a run of 1.5mm t+e clipped direct from the consumer unit and protect it with a 16A 60898.

Yes a 1.5mm ref method c will carry 19.5 amps.

 

[stratplus]

That's because they don't make 0.75mm flat t&e

So are you saying you should never take t+e flat cable into a boiler?

 

[MOSSEP]

or if you got a bit of 1mm pyro knocking about you could use that as well, might be a struggle to make off for most folks though ;-)

 

[ShaunCorbs]

So are you saying you should never take t+e flat cable into a boiler?

is t+e heat resistant 😀

 

[ShaunCorbs]

or if you got a bit of 1mm pyro knocking about you could use that as well, might be a struggle to make off for most folks though ;-)

not if you still have the potting tools 😀

 

[Dotty]

That was why I asked the question. 2.5mm from the board on a 15amp 3036 rewireable fuse to the immersion. Then a 1.5mm from the spur to the boiler with a 3 amp fuse at the spur. Just thought the 15amp at the board should be changed to a 6amp. Wasn't sure with the 2.5mm t+e.

You can't spur off a radial circuit!

 

[ShaunCorbs]

You can't spur off a radial circuit!

how many diyers have 😀

 

[stani]

Flex is used because of the fact the front control panel is made to move for access, flat t&e is used for fixed wiring, and I can't remember pyro being used for anything that could move.

 

[stani]

You can't spur off a radial circuit!

You can extend a radial circuit though,