Say there are 2 branches of sockets that is running on Radial for example the one on the bottom:



anyway to figure out which socket in a room is running on Radial and which one on Loop as i see the sockets have 2 Live, 2 Neutral & 2 Earth in them.

also when i want to add a socket beside the existing socket with 2L/2N/2E, do i just use a 2.5mm2 wire, or do i use a 4mm2 wire since radial uses x2 2.5mm2 wire.

that new socket will further loop into another 2 sockets.

First time unker sees ts actually put some relevant attachment to his tered....

Ok, if you just want to add another power outlet 13A, just add 2 x 2.5mm PVC cable + E (Earthing, 2.5mm) into the loop of 16A mcb. Never disturb 6A mcb for power outlet, 20A mcb just overkill for 13A power outlet

the attachments are from another thread.

the existing sockets already from 20A MCB, but i don't know which socket is radial (2L/2N/2E) from DB and which one is 1L/1N/1E from DB and another 1L/1N/1E that is looped to another socket.

if i want to add a socket beside that existing, i'm not sure should i just use x1 2.5mm2 L/N/E or should i try to match the radial size by using x1 4mm2 wires instead (still smaller than x2 2.5mm2). problem is i have 4mm2 wires but i only have 2.5mm2 green wires. if i pull x2 4mm2 wires + x2 2.5mm green wires might have space issue behind socket as 4mm2 wires are much harder to work on.

btw looks like this:



in the figure can see 1 socket is spurred from the radial and only using 1 set of wires. do we just use x1 L/N/E or do we try to match the spur cable sizing?

use 2.5mm PVC Cable, unker recommend mega kabel or southern cable (local manufacture) for live, neutral and earthing. just loop from existing socket. it is more than enough to handle 13A power outlet.

unless you want to add A/C point, or 15A outlet, then use 4mm PVC cable

if that new added socket is gonna loop another 2 new socket should i go for 4mm2 instead? but earth can still maintain 2.5mm2? coz i only have 2.5mm2 green wires.

and yea i have few rolls of mega kabel. rm80 per roll for the 2.5mm2.

yes, maintain the cable size. But first, check how many outlet is on that 20A loop. Turn of the related MCB and you can count. It is not recommended to add more than 5 13A power outlet on 20A mcb.

Wa...lu olang electrical engineer ka?

if the socket is radial it will be running on a 32A MCB instead.

i figure out if i disconnect the 2L from socket and testpen each wire, if both lights up means it's on Radial, if 1 lights up the other doesn't then it's probably looped to another socket.

but if it's radial, if i use only x1 2.5mm2 green wire for earth, is it ok?

another question is for circuits running on 4mm2 Live & Neutral, contractor say 2.5mm2 earth is sufficient, is this true? using 4mm2 earth cable might result in too big to fit in a conduit (since there's 2 sets of 4mm2 wires using same conduit).

as i said, 2.5mm cable for live, neutral and earth is sufficient enough for a typical 13A power outlet. I have already explained to you with my previous comments. Also, 32A mcb? if that means MAIN circuit breaker, then no. If that means MINIATURE circuit breaker, then also no. The amperage is too high for 13A power outlet. I'm pretty sure my explanation will be about similar from a certified electrical contractor. Else, stop opening sampah thread and go google.

the radial is running on 32A MCB. because it's going to 5 sockets. i want to add a loop socket, then using that loop socket to another 2 sockets. i won't be using all socket at once, just place them so they are convenient located.

also is 2.5mm earth cable enough for wires using 4mm2 Live & Neutral for example Electric Oven & Hob (on individual runs to db)?

this is quite tricky..since socket in the middle of the loop also will have 2L/2N/2E...the only difference is socket that is end of the loop will only have 1L/1N/1E..

the only faster way to identify is to do short circuit test..see which MCB trip..

meh..no need to be an engineer to discuss dis. a little google reading and youtube video, u can do most of these technician level stuff

You dont need to be engineer to know stuff,
But problem arise when you turn to a wanabe engineer cause you know some stuff or did some stuff.
Just like TS, he want do stuff people dont usually do because in theory you able to do the stuff

I study this back in 1987, dun wan headache again no fanks.

well i tried to test the 2L wires, guess what, they already twisted together so unless i separate them (and risk damaging the conductors), i can't testpen them individually.

i think even trip MCB, since the 2 sets of wires are from the same MCB, it won't make much difference? can see them it as running on 5mm2 wires.