Apr 27 2022, 03:28 PM
QUOTE(stormer.lyn @ Mar 20 2022, 09:29 PM)
All electrical items with a metal body must be earthed. This includes the casing of the "fluorescent" tube, even if the tube is LED. Items that are double insulated, like plastic downlights, do not need to be earthed. But the 230Vac wiring to the light must still have the green wire, it is just not connected.
If you do not have an earth for any metal cased item, and should the LIVE touch the case, then the case will be at mains potential which can kill when you touch it. But if there is an earth bonding, then as soon as the LIVE touches the metal case, something in the DB should trip safely. Note that a LIVE wire touching an unearthed chassis, can still work as if nothing is wrong with it. With this in mind, you can run any metal cased item without an earth bonding, but your safety is compromised.
Hi, I would really like some advise - recently I have done whole house renovation with a contractor offering "full package" with cabinet and wet works, but their workmanship seriously have been under sub par so after I kicked them out and moved in, I separately got a qualified electrician to look into potential wiring problems in my house, and they told me that most of the black wires (earth wires) has problem and need to be replaced. The cost is of course a minor problem for me (estimate ~RM10k) plus more importantly they have to hack all around the place where we have already moved in. If you do not have an earth for any metal cased item, and should the LIVE touch the case, then the case will be at mains potential which can kill when you touch it. But if there is an earth bonding, then as soon as the LIVE touches the metal case, something in the DB should trip safely. Note that a LIVE wire touching an unearthed chassis, can still work as if nothing is wrong with it. With this in mind, you can run any metal cased item without an earth bonding, but your safety is compromised.
The electrician said if I don't mind, can wait until when there is problem then only change the whole thing and continue like currently (I have been staying in my Condo unit for 2 weeks).
I understand there are definitely risks involved with not doing anything, but I am not sure what are the risks that is involved for me to consider the trade off. Will it cause electrocution/fire, or at most short circuit and trip/burn the DB?
Can anyone enlighten me?
This post has been edited by yun2: Apr 27 2022, 03:28 PM
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