usually people do radial only.
Ring is more to office.. Where there is redundancy if wiring been cut off. U can imagine?
Just wondering where u heard all these term.

Yeah i am aware that house all using radial circuit... im just stating what i read from some guidelines that if you have ring circuit your cable can take more amps... though not much people using ring.. even in offices =D

The primary reason for using a ring circuit is to support more switch socket outlets over a wider area on a single breaker..

A ring circuit covers 100m2, using 2.5mm2 PVC copper conductor on a single 30 or 32A circuit breaker..

If covering a smaller area just run radial circuit,

- 2.5mm2 for 20m2 on a 20A circuit breaker or

- 4mm2 for 50m2 with a 32A breaker..

I have not really come across people talking about ring circuit so there will be cost saving when this ring circuit is able to loop up more power point. (Maybe i have not seen that much)
We usually talk about ring circuit is the redundancy when some wiring somehow breaks and the power point still can work, as the way they are wired is different.

can refer to page 17 in pdf below
Guidelines For Electrical Wiring In Residential - Suruhanjaya Tenaga
(search and download from google)

Not exactly sure what is your application / reason to do so (just want to save money as looping is cheaper? My thinking is costing can be subjective from contractor to contractor anyway. ). But u just have to understand wiring is designed to carry certain Amps, while MCB (circuit breaker) to ensure Amps flowing thru it will not exceed certain Amps.
Wiring can be oversized but MCB rating shall never be bigger than wiring.
Wiring burnt when carrying higher Amps than it is specified and MCB will not trip if it is not selected properly.

And if you compare the schematic from ST, radial circuit vs ring circuit.. isnt that ring circuit will just an additional looping / return wiring to the MCB.. so shouldnt it be costing more?
Well, up to ur contractor to advise.

This post has been edited by heyamazingpeople: May 5 2017, 12:27 AM

The "Malaysian" wireman will define looping as radial.

While actual looping technically can handle more load because the current are return back to mcb via 2 path. Ring will give redundant and more current. But will also give the danger of over load the wires if one of the path break and load are running high.

Hi Guys,

Can anyone explain to me whether my understanding is correct or not? For no 1-3, is that correct?

And what is no 4? it looks like RCD as well but i do not understand why there are so many RCD in this setup.

Thanks a bunch.

No 3 come from no 4 in the left am i right?

#4 Delixi CDB6VR is a electromagnetic RCCB.

Do note that "RCD" is a very broad term. Many different types of Residual Current Devices (RCD) exist.

For comparison sake:

RCCB. (Residual Current Operated Circuit Breaker without Integral Overcurrent Protection)
RCBO. (Residual Current Operated Circuit Breaker with Integral Overcurrent Protection)


RCCB is only an earth leakage protection device.
RCBO is Short circuit current protection device as well as earth leakage protection device.


The RCCB only measures the out of balance in current in the active and neutral wires. This is the current leaking to ground. It protects you against shock.
The RCBO does what the RCCB does, plus it has overload protection.