RCCB for Water Heater
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 Jun 11 2022, 03:25 AM
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#1
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Newbie
16 posts Joined: Feb 2010  
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Hi all, my current water heater is not connected to RCCB. I plan to install RCBO instead of RCCB due to limited space at my current DB box.
Question, since the neutral wire from double pole switch for water heater is connected directly to the neutral busbar in db box, how can I identify which is the neutral wire for it, so that I can divert it to the outgoing at the RCBO? Many thanks in advance for your reply. |
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Jun 14 2022, 12:53 AM
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#2
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Newbie
16 posts Joined: Feb 2010
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QUOTE(ceo684 @ Jun 11 2022, 05:25 PM) By the process of elimination. Thanks for the reply. On another note, I have one issue with my newly installed RCCB (brand EPS, 63A, 100mA). The RCCB will trip once the main power is switched on, even when all the MCB are switched off. Any idea why is this happening and how to troubleshoot? My electrician is telling me my RCCB is faulty and I'll need to get a new one.Obviously, it won't be the 1.5mm thin wires. So out of the 2.5mm pile.. disconnect half and test continuity. (isolate the bunch u disconnected - make sure it doesnt contact elsewhere). if its not lighting up the double pole switch LED then u have isolated that "half" - its somewhere in that isolated pile. Its not hard, but its annoying coz you don't know which is which at the neutral. But it is a necessary evil and salute you for installing a 10mA RCD/RCBO anyhow.  |
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Jun 14 2022, 02:12 AM
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#3
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Newbie
16 posts Joined: Feb 2010
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QUOTE(ceo684 @ Jun 14 2022, 01:01 AM) Also by process of elimination, it should not be hard for the electrician to prove a component or the load is faulty by hooking up a test load like a lamp or something (ie disconnect everything else). Sometimes old wiring or old appliance can be leaky. A competent electrician can easily swap out your RCCB with another 100mA unit that he/she has in stock. Thanks for the suggestion. Unfortunately, my electrician does not have a spare 100mA RCCB, instead he swapped it with his spare 300mA RCCB and it stops tripping. Therefore he is telling me that my newly bought RCCB is faulty and to get a new one. Just wondering, will it be possible it's due to earth leakage from a neutral wire? |
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Jun 14 2022, 03:45 PM
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#4
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Newbie
16 posts Joined: Feb 2010
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QUOTE(ceo684 @ Jun 14 2022, 08:06 AM) That is where the process of elimination comes into play (if there is no load connected at all to the RCD you bought) then it should stay energised. I think it's time for me to get a certified electrician to get the job done. He has no idea what I'm talking about when I asked him to perform a test circuit to confirm if the RCD is indeed faulty. He even suggested for me to buy a new RCD that is less sensitive (300mA) just like the spare RCD he has installed for me. I do not want to be killed 6 times over so I just brushed him off. Thanks again for your reply.He can also slave the 100mA you bought into his 300mA onto a spare bulb as test circuit just to test the RCD functionality. You should return it for more reputable brands if even a controlled test circuit refused to work. |
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