RCCB for Water Heater

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RCCB for Water Heater

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lowyat101	Jan 6 2023, 10:50 AM Return to original view \| Post #1
Look at all my stars!! Senior Member 2,538 posts Joined: Sep 2011	» Click to show Spoiler - click again to hide... « QUOTE(judesh @ Jan 6 2023, 08:03 AM) Hi Guys, after reading the comments here I decided to check what's in my house. It's a 2 storey house in Melaka with 3 phase supply. 1 WH connected to dB downstairs which I will replace with 10mA RCCB. Will also replace the main 4P 100mA RCCB with 30mA from ABB. Upstairs DB will also replace main 100mA RCCB to 30mA.... But all slots full so can't change to RCCB for each WH so looking at options... 1. Change 14way to 18way DB? 2. Replace with 10mA RCBO for the 2 WH...is this PnP or need also to identify the N and connect accordingly? 3. Maxguard or any other Sirim approved 10mA RCBO ok or recommended Schneider only? 4. All the WH are connected by plug socket in wall above inside bathroom. Will also replace this with splash proof socket as recommended... Can I connect the 10mA RCCB above this socket instead ? Or above switch outside bathroom? Thanks ~~just curious, why you want to use the 30mA for the mains?~~ sorry ignore the questions above, just found out that my house also having the 30mA This post has been edited by lowyat101: Jan 6 2023, 10:57 AM
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lowyat101	Oct 12 2023, 05:22 PM Return to original view \| Post #2
Look at all my stars!! Senior Member 2,538 posts Joined: Sep 2011	QUOTE(JinXXX @ Oct 12 2023, 01:50 PM) your pic shouldn't the wire be 16mm coming out from the main switch ? ? rather than 10mm ? or cause you have 40a/30ma rccd thats why you ok with 10mm ? i think he got another 100mA rccd on the upper part for the socket outlets, there's another 10mm cable going up there
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lowyat101	Oct 13 2023, 08:11 AM Return to original view \| Post #3
Look at all my stars!! Senior Member 2,538 posts Joined: Sep 2011	QUOTE(JinXXX @ Oct 12 2023, 09:07 PM) how fat is a 16mm vs a 10mm actually , the diameter ? until well you not wanting to deal with 16mm wire? ps how u do the mm square thinggy ? My understanding is, the 10mm2 cable is ok since TS is not expecting the current over this circuit to exceed this, but TS need to install a 40A MCB before the 40A RCCD. To me this is a must, else you are right that the cable should then be 16mm2.
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lowyat101	Oct 13 2023, 09:12 AM Return to original view \| Post #4
Look at all my stars!! Senior Member 2,538 posts Joined: Sep 2011	QUOTE(JinXXX @ Oct 13 2023, 08:53 AM) doesnt the 40A rccd also functions like a MCB ? I don't think so, RCCDs are only for leakages/imbalance load. you will need a RCBO to cover the overcurrent protection. That's what i see in my current DB also, there's this extra MCB before the RCCD. But I'm not an electrical engineer, so pls correct me if I'm wrong Attached thumbnail(s)
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lowyat101	May 13 2024, 09:34 AM Return to original view \| Post #5
Look at all my stars!! Senior Member 2,538 posts Joined: Sep 2011	At my parent's old house, there's no dedicated circuit for the WH with 10mA RCCD at the DB. I'm thinking to install a RCCD at the incoming power cable inside the bathroom itself (at high level above the WH) then only connect the WH cable to the RCCB. I guess this will serve the same function for protection right? Thanks
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lowyat101	May 13 2024, 09:38 AM Return to original view \| Post #6
Look at all my stars!! Senior Member 2,538 posts Joined: Sep 2011	BTW may I know is this brand EPS good enough?
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