Renovations 3-phase wiring
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 Mar 20 2025, 05:23 PM
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#1
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Junior Member
98 posts Joined: Oct 2008 
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hi guys
my house is running 3 phase and currently I redo the whole wiring for the house. The electrician told me for main switch to use 63Amp and the ELCB 40A 300mA - one for switches and another ELCB 40A for 13A plugs. So when there is a trip, we can know whether it's from the plug or the lighting/fan. May I know if this is the right way to do? |
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Mar 21 2025, 07:22 AM
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#2
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Junior Member
98 posts Joined: Oct 2008
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QUOTE(stormer.lyn @ Mar 20 2025, 10:17 PM) Residential cannot be using 300 mA anymore. Has to be 100 mA for lights, and 30 mA for sockets. Also there has to be 10 mA protection for wet areas. Also why is the incoming 63 A but the protection 40 A? The electrician said 40A is enough as we split it into 2 - one for lights and one for 13A sockets. He totalled it and said 40 +40 is good enough.. He said he usually use 300mA and no problem and cheaper..but I m buying the stuff now so I want to make sure to use the correct ELCB, MCB He also said if use 100mA will be easier to trip when there is lightning but I also added Surge Protector (SPD ) to the DB. So the protection should also be 63A? |
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Mar 21 2025, 11:04 PM
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#3
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Junior Member
98 posts Joined: Oct 2008
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QUOTE(stormer.lyn @ Mar 21 2025, 06:34 PM) Just because you split into 2 you think the electrical current will respect your split and only let 40 A go into one branch of the circuit? I think I better ask another qualified electrician...thanks for the guidelines...Anyway, I wasn't discussing your installation as told to you by your electrician, I was telling you the rules that are stated by Suruhanjaya Tenaga. You can follow or not, up to you. |
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