A friend of mine has had her house rewired and the electrician plastered
over the cables. She thinks that the cables should be covered by conduit.
But the electrician said the conduit is not required anymore due to the new
Does anyone know if this is correct?
I certrainly wouldn't wire an installation like that. To me it is a very
sloppy way of doing things. All the cables in my house are burried in the
walls inside 20mm pvc conduit. Makes it far easier if you need to do any
maintenance work on the cables etc.
Typical "maintenance" is to want to add another lighting circuit and
another way on the light switch. If the conduit/ trunking whatever has
enough spare space, it may be possible to pull one or more extra cables
down to the switch, without requiring re-plastering, painting etc.
So I usually put oversize conduit/trunking to light switches, as the
extra cost is pretty small and the trend does seem to be for more than
one lighting circuit in many rooms.
Something that I have thought about doing is fitting an extra double
socket at the side of existing double sockets. If say a double socket is
fed from above in a ring main circuit, and an additional socket was
required at the side of it, is it acceptable to feed the new second
socket with a single short length of 2.5 twin and earth, or has the new
socket got to be incorporated fully into the ring main? To do this would
normally require a longer length of cable from the previous socket in
the ring and the existing socket/new socket to achieve this, or is there
an alternative way to correctly wire the new socket from the existing
socket without replacing the longer existing cable. If a new length of
cable has to be fitted, I was thinking this would be a good reason for
having cable running through conduit, as one of the existing cables
could be easily pulled out, whilst at the same time pulling in the new
Check out the rules for adding a spur off an existing socket. In general
you can run a cable from an existing socket on a ring main to feed an
additional spur socket - unless this has already been done.
Or, of course, you can buy a special double socket that will replace a
single and a special triple that will replace a double - with no wiring
alterations and typically no decorating/ hole cutting or whatever.
Conduit isn't (and never has been) required for straight cable
runs which are horizontal or vertical from a visible wiring
accessory (such as a switch, socket, etc), or run vertically
near the corner of a room, or horizontally near the ceiling.
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Several years ago I fitted wall lights and extra sockets without using
conduit. The plaster wasn't thick enough to accommodate anything more than
the cables & clips and I didn't want to excavate further as the inner leaf
is brick. All the cable runs are vertical. I did however use junction
boxes under the upstairs floorboards to complete ring circuits - is this
permissible? and if not, what is the alternative?
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