|If you are thinking of editing this page please be aware that the original author(s) of this page may be actively working on it at this moment, so changes you make may clash with theirs. (The Wiki software will warn you of conflicts if this happens.) Checking the page's history tab for frequent recent edits can warn you if changes by others are likely.|
(this is a draft outline - feel free to add topics you would like to see covered)
This article covers the ways in which you can safely extend existing socket circuits to provide more outlets.
How many sockets?
Extending radial circuits
Extending ring circuits
New sockets can be added as part of the ring, or as a spur. Itsv ery much recommended to add them as part of the ring where this is practical. This means breaking the existing ring, and often adding a bit more cable.
A relatively easy way to add new sockets as part of a ring is to cut the existing cable run and fit 2 new sockets, one to each end of the cable, then link the 2 with a new piece of cable.
Sometimes running a single piece of cable from an existing point in the ciruit to a new socket is the only practical option. This is called a spur, and is subject to some limitations.
- an unfused spur should only feed one single socket
- a fused spur can feed an unlimited number of sockets. Many multi-way sockets have a fuse built in to provide the needed fusing.
Many single spurred sockets have been replaced with a double socket. This is not regs compliant, but is common.
2.5 mm^2 is sufficiently rated for 30/32A ring circuits as long as its not buried in 100mm or more of insulation. Its also good for 20A radials as long as its not buried in 100mm or more of insulation.
4 mm^2 is used for 30/32A radial circuits, and 30/32A ring circuits where the cable will be buried in insulation.
1.5 mm^2 cable is occasionally used on radial circuit where the circuit is fused at or. This is typically done where an old immersion heater feed is reused to supply sockets.
- describe allowable zones