another loop in out question

[chrisreid186]

room one has 4 down lights and 1 switch
room two has 2 down lights and 1 switch
consumer unit has no spare ways

3 options on how to wire

option 1 : loop in and out from switch (3 cables at switch)

feed from mcb >>> light switch room 1 >>> room 1 lights
>>> light switch room 1 >>> light switch room 2

option 2 : loop in from 1st light (requires two joint box's at 1st lights )

feed from mcb >>> 1st light room 1 >>> 1st light room 2
>>> 1st light room 1 >>> light switch room 1
>>> 1st light room 1 >>> rest of lights room 1

option 3 : two feeds from the same mcb to each room

feed from mcb >>> light switch 1 >>> room 1 lights

feed from mcb >>> light switch 2 >>> room 2 lights

Q1)which way would you wire it????
Q2)would option 3 be a spur from a spur or bad practise?? i'm thinking it would be ok as neither would be able to pull more then 6 amps

 

[telectrix]

every downlight should have a joint box, so as to use H/R flex to the fitting. wago or screw JB.

 

[Hawk81]

I would probably do option 2 but would do option 1 without any worries.

 

[Des 56]

Option 1 and option 2 and option 3 and option 4

Has this forum caught the AV referendum bug


I go
Option 1
Option 3
Option 2

Do we really think its ok having these neutrals at the switch

 

[Adam W]

Option 3? You can have 2 circuits on one mcb but the 2nd circuit is classed as a spur and can only used to feed one fitting, so may not be an option for you.

With a final circuit yes, but lighting circuits are generally radials so it's basically extending it twice. The existing cable should be able to take whatever the protective device will let through it.

 

[Paul.M]

With a final circuit yes, but lighting circuits are generally radials so it's basically extending it twice. The existing cable should be able to take whatever the protective device will let through it.

Yep, we are talking about lighting circuits and not socket circuits aren't we? Doh!!!! I'll shut up and go and play in the chit chat room for the rest of the night. Sorry about that, take no notice of me.

 

[Paul.M]

Are you sure?

I got confused dot com . Forgot we were on about lighting circuits.

 

[londonlec]

I got confused dot com . Forgot we were on about lighting circuits.

No worries mate, thought you were about to teach me something I didn't know!

 

[chrisreid186]

changing the subject slightly

am i right in saying
spuring from a spur is not a good idea on a ring because the single cable could potentially pull 32amps which is too much for that single cable.

so why cant you spur from a spur on a radial? as long as you stay to the maximum floor area the cable will only be able to pull say 16amps

 

[topquark]

You are not allowed to spur from a spur unless via an FCU, for that reason

 

[Guest 004]

You are not allowed to spur from a spur unless via an FCU, for that reason

reg 433.1 ..........