Confused

[Pete999]

I'm going to ask what might sound dumb coming from someone of my age and experience, I don't do much now and have done very little in the way of domestic installations, having spent much of my time on commercial or industrial work, thats not to say I don't know how to install domestic electrical installations. The confusion lies with junction boxes under the floors of houses during a rewire, many moons ago on a social housing project we wired everything lighting wise, back to a central point on the first floor, and connecting the lighting points and switches in a large junction box, likewise if we needed to add a 13a socket we would sometime break into the RFC with a 30a JB fitted to a noggin under the floor. My question is, is this still allowed? I mean fitting a JB under the flooring and forming a trap, where possible in the floor boards.

 

[imago]

Junction boxes are allowed if they're either accessible or maintenance free. To be honest though they're to be avoided where possible to make life easier for anyone following.

 

[fredrico]

I use maintenance free joint boxes under floor boards if necessary.

 

[Pete999]

by MF I take it you mean Wagos, not screwed connectors?

 

[imago]

Anything that is marked "MF" to satisfy the regs. If it's not marked it doesn't count even though it may be maintenance free.

 

[Octopus]

google J803 & j804

 

[Richard3009]

Anyone using Sureway prewired JB's for complete house wires?

 

[davesparks]

You what now? A pre wired JB, is that some kind of idiot proof box with a labelled terminal for each conductor. Can't see how it would work unless they are made to order for each installation as each installation will be different.

I can understand prefab wiring for estates of identical houses, but this just sounds daft.

 

[richy3333]

JB's on a rewire or new build. That's as rough as a badgers...

 

[Richard3009]

That's the long and short of it, line in, 8 outputs for lights, one switchwire connection and variants there of.

 

[davesparks]

JB's on a rewire or new build. That's as rough as a badgers...

How do you wire your lighting circuits then? Upstairs is always an RB4 in the loft when I wire a house.

 

[davesparks]

That's the long and short of it, line in, 8 outputs for lights, one switchwire connection and variants there of.

That's great if you want one switch to control 8 lights!

I can't see that catching on really, but then with the rapid decline in knowledge and skill in newcomers to the industry even this wire by numbers approach would probably confuse some people!

 

[Richard3009]

There are many variants you can have one with four outputs controlled by four switchlines, for four bedrooms

 

[Richard3009]

That's great if you want one switch to control 8 lights!

I can't see that catching on really, but then with the rapid decline in knowledge and skill in newcomers to the industry even this wire by numbers approach would probably confuse some people!

It's got nothing to do with knowledge it's about making things simple neat and quick

 

[7029 dave]

google J803 & j804

Had a look at those on net,look pretty good , products getting better, still liked the Ashley jb.

 

[davesparks]

It's got nothing to do with knowledge it's about making things simple neat and quick

An RB4 is simple quick and neat. And you don't have to buy a different one for different numbers of switches and lights.

I can't imagine a prewired JB being very neat really. I would imagine you'd end up with cables entering from all directions.

 

[Richard3009]

cables from all directions, well with a central hub surely that's the general idea

 

[davesparks]

No, that would be awful.

You have all cables approach an RB4 from one direction. In a loft the would often all be clipped along a binder or on top of the collars around the edges.

The RB4 gets mounted on a piece of wood with a good 8 inch space for the cables to be clipped up to it and written on. With a little bit of thinking and a logical working order you can get each switch cable next to each light cable without any cables crosding over.

 

[Richard3009]

how the hell does a cable approach from a certain direction, give me a cable and I will make it arrive at any angle you wish at a JB

 

[davesparks]

I don't doubt that you will have cables approaching from any and all angles.

I however will work with neat and tidy straight lines and right angles so far as is possible.