There's Black, Blue and Green here. Green should be earth.
Wiring guide : 3 color wire (green, blue,black), Which one neutral, live and earth
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 Jan 30 2022, 03:22 PM
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#1
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Junior Member
88 posts Joined: Jan 2003 From: Penang  
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Which one is Live line? Black or Blue?
There's Black, Blue and Green here. Green should be earth. |
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Jan 30 2022, 04:00 PM
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#2
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Junior Member
88 posts Joined: Jan 2003 From: Penang
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QUOTE(ozak @ Jan 30 2022, 03:29 PM) Usually is blue. OK. Thanks for advice. If you want to confirm, take out the DB box cover. Check what color the wire that connect all together on the terminal. That is neutral.  I just tried to open up another wall socket to check. This one has yellow / black / green. So, I can assume black is common colour for neutral, and yellow is Live as it's connected to the live terminal of the socket. Black should be common colour for Neutral line then. Was confused because I always remember guideline for Brown / Blue / Green in the past which were Live / Neutral / Ground respectively. Blue was neutral. Probably colour scheme updates to accommodate 3-phase power supply network?  |
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Jan 30 2022, 04:57 PM
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#3
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Junior Member
88 posts Joined: Jan 2003 From: Penang
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QUOTE(ozak @ Jan 30 2022, 04:46 PM) Brown/ blue/green wire code is for electrical appliances. Right. So in this case, can't really assume Black is usual Live. Have to really verify, either by reference connection, or by test pen, to be sure.For house wiring, doesn’t follow this code. If 3phase incoming, red/blue/yellow is using and black is neutral. The only color that all what kind of code have to follow is the green for earth. |
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Jan 30 2022, 10:19 PM
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#4
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Junior Member
88 posts Joined: Jan 2003 From: Penang
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Actually, I'm looking for a standardised spec for Malaysia power line colour code. Everyone should follow the same standard to avoid confusion nor misunderstanding.
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Jan 30 2022, 10:37 PM
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#5
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Junior Member
88 posts Joined: Jan 2003 From: Penang
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Yes, I've monitored a foreigner contractor installing LED ceiling lights before. One out of several lights, he actually tested one light and tripped the power. He happened to connect earth line to LEDs neutral terminal. 🤦♂️ Can't imagine how many connection mistakes could have been hidden from owners' view without knowing. Reversed Live and Neutral connection may be another hidden danger.
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Jan 31 2022, 02:45 AM
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#6
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Junior Member
88 posts Joined: Jan 2003 From: Penang
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QUOTE(ceo684 @ Jan 31 2022, 12:42 AM) It's in MS1979 spec and ST guidelines. Item 5.5 Now we all can technically discuss with proper standard reference from Suruhanjaya Tenaga. It's supposed to be governed by law too. Thanks a lot for sharing and pointing out. I think everyone should have this MS doc handy.  |
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Feb 2 2022, 12:26 AM
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#7
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Junior Member
88 posts Joined: Jan 2003 From: Penang
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QUOTE(louyeh @ Jan 31 2022, 04:37 PM) Electrical wire colour code is only reliable if its practiced at the main DB first. How to differentiate N and E by DMM?Test pen can't differentiate Earth vs Neutral. Multimeter is the better tool. E & L = 230VAC E & N = As close to 0VAC as possible, 1-2VAC is fine. Anything higher indicates improper wiring/installation L & N = 230VAC Majority of electricians rely on test pen. The minorities don't bother to use one as they don't understand E & N difference. |
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