hi guys.. just wanted to ask some expert here.. what is the maximum amp that a 4mm cable with radial looping can take ? I read somewhere that a 2.5mm cable can take 20amp for radial circuit and 30amp for ring circuit... hope to get some help from some sifus here..

This is not actually straight answer. Ability of wire to transfer current is different when transmitting over free air, inside concrete wall, how close two wire together, in trunking, etc. It also depends in ambient temperature.

In general, it is about 20A for 2.5mm cable. The ring circuit can carry more just because the current can be supplied in both direction from the Main Distributor Box. You can refer from this for Malaysia Guideline from Suruhanjaya Tenaga (ST)

http://www.st.gov.my/index.php/en/download...ntial-buildings

The 4mm can carry 26A under 30C ambient temperature. I'm no sifu

I'm no sifus but was also interested to know... My understanding is that the length of cable also play a part. By the way, what you want to use it to power for? Home appliance rarely take more than 20A

copper or aluminium ?
made in malaysia or PRC ?
mega kabel or other brands ?
in the wall or outside ?

better put a decent margin

Refer to the link I provided. I think it is easy to understand. Very good guide by ST

NICE

thanks a lot guys its actually conceal in concrete wall with pvc conduit....not using mega cable but made in malaysia cable with SIRIM

with JKR and ST chop is better quality

Conceal cables will carry less load. 2.5mm in paper specification can go more than 20amps, but in real life use is better to be limit to 15amps. We cannot guarantee copper purity, bending issues that reduce the copper conductivity etc..

Here can give you some rought guide, always go lower than recommendation, don't go test threshold when life is at stake.

http://www.cable-ratings.co.uk/

I would go with the Suruhanjaya Tenaga guidelines and progressively updated..

Hi, i would like to ask is it safe for live wire for light and ceiling fan to be running at the floor?
And also is it safe for 2x1.5mm and 1x 1.5mm cable to supply 2 rooms and 1 bathroom, with heater, total of 7 sockets and 5lamps, 1 exhaust fan?

I assume you are running it on first floor for ground floor light if that is ok? You have to know where the wires are if not in future it you drill the floor will hit the wires. putting under the ground floor will be bad as moisture and underground termites may damage the cables.


1.5mm are way too thin, you need minimal 2.5mm, and each room minimal need one mcb, bath room seperate mcb.

It's in the ground floor living room, the wiring supplies fan and light, have 5 wires running in the ground but exposed like this..



This post has been edited by tangenttheta: Apr 28 2017, 11:08 AM


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This is really a lousy wiring man job. Furthermore without conduit. Good luck.

All standard wiring have to come from top to bottom, not bottom up, water is bottom up.

Unless you have steel wall

I see.. so this is not the standard doing ya? Thanks thanks man..

where do u get to hear about ring and radial circuit?
Are you asking for your house renovation work? or Office, etc.?

House... wanted to loop further points... hence wanted to know the limitations...

keep in mind the standards are referring to genuine copper cable.
many fakes out there ya

Ring circuit and looping are two different things.