fused spurs

[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.

 

[stratplus]

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

Of course.

 

[stratplus]

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.

This example is just for a combi. so cylinder gone, immersion switch changed to fcu for combi.

 

[ShaunCorbs]

This example is just for a combi. so cylinder gone, immersion switch changed to fcu for combi.

whats about the boost button in the kitchen like most old house had?

 

[stratplus]

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

Regardless of the run/distance and route ie under floorboards through joists?

 

[stratplus]

whats about the boost button in the kitchen like most old house had?

Pass, lol

 

[MOSSEP]

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

Categorically states not off radials.

Have to disagree there, although not got an OSG to hand to check. Spurring from radial circuits
when fused and wired correct is no issue at all. A 16A radial circuit run in 2.5mm T&E for instance cannot result in overloaded cable if the spurred cables are in 2.5mm T&E.

 

[ShaunCorbs]

Regardless of the run/distance and route ie under floorboards through joists?

no fcu should be by the boiler as to isolate the boiler and not having to search half the house to find it

 

[stratplus]

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

Why not? (Other than the fold down cover issue)

 

[stani]

Why not? (Other than the fold down cover issue)

20 years ago the boiler, the pump everything was wired in t&e, nowadays it 'good practice' to use flex.

 

[ShaunCorbs]

Why not? (Other than the fold down cover issue)

t+e doesnt like repeated movement, esp with heat the pvc goes hard and then you fold the cover down and it splits leaving the inner cores on show

 

[stratplus]

is t+e heat resistant 😀

Mi's don't mention anything about being heat resistant cable. As long as not touching any pipework?

 

[ShaunCorbs]

Mi's don't mention anything about being heat resistant cable. As long as not touching any pipework?

mi dont say alot about the elec side that why you should refer to osg or get a sparky in

 

[Dotty]

Have to disagree there, although not got an OSG to hand to check. Spurring from radial circuits
when fused and wired correct is no issue at all. A 16A radial circuit run in 2.5mm T&E for instance cannot result in overloaded cable if the spurred cables are in 2.5mm T&E.

I can't agree withyou. No point in both of us being wrong.

Especially as I happen to be doing my part P this week.

Your move batman.

 

[stratplus]

no fcu should be by the boiler as to isolate the boiler and not having to search half the house to find it

Ok, so if you were to utilise the old immersion circuit and change the faceplate to a fcu, would you run another cable to a second fcu by the boiler? Never taken any notice before now tbh.

 

[ShaunCorbs]

Ok, so if you were to utilise the old immersion circuit and change the faceplate to a fcu, would you run another cable to a second fcu by the boiler? Never taken any notice before now tbh.

the boiler going in the airing cupboard?