Electrical Wiring, Maximum Amp for 4mm cable
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 Apr 18 2017, 08:09 AM
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#1
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Senior Member
7,938 posts Joined: Mar 2014 
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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  |
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Apr 18 2017, 08:18 AM
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#2
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Senior Member
7,938 posts Joined: Mar 2014
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QUOTE(cdspins @ Apr 18 2017, 08:10 AM) 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 Refer to the link I provided. I think it is easy to understand. Very good guide by ST |
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