Sub main advice please

[mossep]

This book

 

[mossep]

View attachment 44956

 

['mr2'gd4u]

What book is that in mossep?

Bbb p121

 

[Baddegg]

Bbb p121

Thanks, wasn’t taking the pi$$ I’m still on the byb and couldn’t find it...

 

[mossep]

Its in the BYB too, not sure what page though but probably a similar reg number.

 

[Spoon]

Its in the BYB too, not sure what page though but probably a similar reg number.

537.1.4 A main linked switch or linked circuit-breaker shall be provided as near as practicable to the origin of every installation as a means of switching the supply on load and as a means of isolation.

A main switch intended for operation by ordinary persons, e.g. of a household or similar installation, shall interrupt both live conductors of a single-phase supply.

BYB page 154

 

[MDJ]

Nothing wrong with a Joint if it is done right, and if there is no other way, I don't think the job has been planned properly at all, a 16mm2 armoured and 16mm2 t&e for a very small out building with one ring a heating mat and a couple of lights, plus direct connection to an isolator and no OCPD is of concern, I appreciate the OP is very inexperienced and such should answer questions aimed at him by the other guys on here, I have seen him post since these questions and not answer. Has he concidered RCD protection for example, what type of earthing arrangement, is it notifable work? a lot to take in for a very basic job, hopefully he will start again and let us all into his thoughts so we can try to help properly. By the way that Bob the Builder book isn't great, I have the set, that story is one of the worse ones

 

[mossep]

Its might not be great, but it helped me build my loft extension!

 

[Baddegg]

537.1.4 A main linked switch or linked circuit-breaker shall be provided as near as practicable to the origin of every installation as a means of switching the supply on load and as a means of isolation.

A main switch intended for operation by ordinary persons, e.g. of a household or similar installation, shall interrupt both live conductors of a single-phase supply.

BYB page 154

Thanks spoon I’ll be in there later.

 

[Baddegg]

Its in the BYB too, not sure what page though but probably a similar reg number.

Thanks mossep

 

['mr2'gd4u]

Thanks, wasn’t taking the pi$$ I’m still on the byb and couldn’t find it...

Its OK.. I still haven't booked my 18th exam. Don't think I'm gonna get a place before Jan either .

 

[Octopus]

537.1.4 A main linked switch or linked circuit-breaker shall be provided as near as practicable to the origin of every installation as a means of switching the supply on load and as a means of isolation.

A main switch intended for operation by ordinary persons, e.g. of a household or similar installation, shall interrupt both live conductors of a single-phase supply.

BYB page 154

Which is open to interpretation ... A main switch per fuseboard and per switch fuse could serve to provide the necessary isolation.

If not hundreds of thousands of properties could be deemed dangerous

 

[mossep]

Which is open to interpretation ... A main switch per fuseboard and per switch fuse could serve to provide the necessary isolation.

If not hundreds of thousands of properties could be deemed dangerous

I don't think it would mean properties would be dangerous, just poorly designed.

Would you have the same opinion if you went into the mains room of a large factory and had to shut off the power in an emergency, and instead of having a single main isolation switch, you had a series of 15 randomly placed switch fuses and fuse boards? BS 7671 applies to all setups after all.

 

[DPG]

Not quite the same thing though is it. Two consumer units next to each other do not really create an isolation problem. Certainly not one which means it is essential to install a separate isolator next to them anyway.

 

[Matthew]

MDJ - thanks for your reply. To clarify intent. Split incoming mains and install a CU house side that will feed 16mm to outbuilding. CU in outbuildings supplying one RFC one lighting circuit and 15m2 of UFH and two electric Velux. The reason for T&E into SWA was picked up in a post - for aesthetics as conduit into box outside looks better than trying to get 16mm SWA out and down a wall. Does this answer Qs or have i missed something? Thanks so far all. I was going to install a mains isolated while i was there as currently not one