fused spurs

[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,

 

[MOSSEP]

You can spur, and extend from a radial circuit as long as the cable is sized correctly. Its not great practice to spur from an immersion heater radial though as the OSG appendix 8 says that water heaters of 15l capacity or more should be on there own circuit.

 

[Dotty]

You can extend a radial circuit though,

Agreed, but extending is one thing, spurring off another entirely.

 

[MOSSEP]

Why is that?

 

[ShaunCorbs]

Why is that?

tbh mate you wouldnt need to know unless your going trough a sparky/part p course

 

[stratplus]

You can't spur off a radial circuit!

Just for the record I never wire boilers hense all the questions/confusion!
Croppie are you saying that you cant change an immersion for a fcu?? Thought this was standard on refurbs to use the old immersion for the new boiler?

 

[Dotty]

You can spur, and extend from a radial circuit as long as the cable is sized correctly. Its not great practice to spur from an immersion heater radial though as the OSG appendix 8 says that water heaters of 15l capacity or more should be on there own circuit.

The osg says about spurring off ring mains, one spur per outlet (or double outlet)

Categorically states not off radials.

 

[ShaunCorbs]

Just for the record I never wire boilers hense all the questions/confusion!
Croppie are you saying that you cant change an immersion for a fcu?? Thought this was standard on refurbs to use the old immersion for the new boiler?

you can when you remove the immersion/cyclinder but you can spur off an immersion circuit with the immersion still in use

 

[stratplus]

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.

So what if the boiler cable is totally seperate/nothing to do with the fold down panel?!

 

[ShaunCorbs]

So what if the boiler cable is totally seperate/nothing to do with the fold down panel?!

dont take too much into your head just use flex from a fcu to the boiler

 

[Dotty]

Just for the record I never wire boilers hense all the questions/confusion!
Croppie are you saying that you cant change an immersion for a fcu?? Thought this was standard on refurbs to use the old immersion for the new boiler?

Course you can do that, senseless not to. But you'd be changing the immersion isolator to a FSS to feed the wiring centre. Any remote isolators, such as in the kitchen, for example, would need to be turned into a junction and blanked off.