Adding 5A lighting sockets.

[davesparks]

Exactly, because it doesn't contravene any. In fact many books completely dispel the myth of "bad practice".

What about conduits running into an adaptable box, or an adaptable box bushed off a trunking?

Or a dis board, which will obviously have many circuits within it.

There is absolutely no reason for multiple circuits not to be contained within them.

I was taught that it is equally bad practice to do it with a DB! And it does get really irritating when it has been done in a DB and you have to replace the DB! Wasting time tracing where the rogue cables are fed from to isolate them and pull them back out of the way

 

[Guest77]

Well here is a thing, what about having circuits running through lights then? what happens when you need to remove the light but there are several live ciruits in it? there is one big reason why multipul circuits should not run through other enclosures, a big reason, maintenance. you could have a conduit in one end of the light and out the other to a socket for example, this is whyyou use tee boxes or other boxes to avoid circuits running through things like sockets and lights.

 

[Risteard]

I was taught that it is equally bad practice to do it with a DB!

You hardly have only one circuit in a DB.

 

[davesparks]

Exactly, because it doesn't contravene any. In fact many books completely dispel the myth of "bad practice".

What about conduits running into an adaptable box, or an adaptable box bushed off a trunking?

Or a dis board, which will obviously have many circuits within it.

There is absolutely no reason for multiple circuits not to be contained within them.

Just to clarify we are talking about circuits passing through accessories in which they don't terminate or wouldn't normally be expected to be. So all the circuits fed by a DB are terminated in there, but a circuit fed from another board which passes through it would be bad practice

 

[Risteard]

Well here is a thing, what about having circuits running through lights then? what happens when you need to remove the light but there are several live ciruits in it? there is one big reason why multipul circuits should not run through other enclosures, a big reason, maintenance. you could have a conduit in one end of the light and out the other to a socket for example, this is whyyou use tee boxes or other boxes to avoid circuits running through things like sockets and lights.

Generally speaking you arent likely to be replacing the backbox though, are you?

In the case of a luminaire, you would be better going through a BESA box behind it. Still no reason why multiple circuits can't be in the conduit.

 

[Guest77]

In the conduit I have not problem with a say 2 circuits in one pipe, but running through an outlet a different matter.

 

[Pete999]

Exactly, because it doesn't contravene any. In fact many books completely dispel the myth of "bad practice".

What about conduits running into an adaptable box, or an adaptable box bushed off a trunking?

Or a dis board, which will obviously have many circuits within it.

There is absolutely no reason for multiple circuits not to be contained within them.

Adaptable boxes conduit boxes are OK because you don't have to isolate anything to get at the cables, if you ran two or more circuits through an accessory box then isolation is a must, common sense really isn't it?

 

[Andy78]

Exactly as is being said here, I was always taught that if all wires terminating in the enclosure are isolated you should expect no other wires to be energised, and to wire that way.

 

[ImpededLoop]

I was also taught that it is bad practice and I would never dream of it for a new installation, but for an existing installation where the 5A outlet will be directly next to the 13A outlet, I can't see it causing a problem and it saves a lot of disruption with chasing the walls.

You can calculate whether you need to derate the cable due to grouping factors. A 1.5mm cable with a table lamp on the end of it is not something that is likely to cause you too much trouble and the final circuit to the sockets can probably be derated if required.

 

[davesparks]

You hardly have only one circuit in a DB.

No, but they all terminate there, it's circuits which pass through that DB which are fed from another DB which are equivalent to what we are discussing here. Circuits passing through an enclosure which don't terminate there or otherwise need to be there

 

[davesparks]

Generally speaking you arent likely to be replacing the backbox though, are you?

In the case of a luminaire, you would be better going through a BESA box behind it. Still no reason why multiple circuits can't be in the conduit.

Aren't you? Try doing maintainence and callouts, you'd be amazed how many switch/socket back boxes on conduit installs get broken.
Multiple circuits on conduit is fine, it's what it's there for, multiple circuits running through accessories where they don't terminate is not good practice though

 

[Risteard]

It mightn't be ideal but it is certainly permitted.

As such it's not something I can fault unless the spec specifically states that it isn't to be done.

 

[malcolmsanford]

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