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RCCB for Water Heater
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empoleon
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 Oct 17 2021, 08:51 PM
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Getting Started
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QUOTE(ceo684 @ Jun 19 2021, 03:26 PM) For RCD it will trip. Main RCD max current rating (40A part of that 40A 0.03) should match or exceed the main MCB rating (40A). Please help me to check if my house wiring is correct. My 3600W water heater shares a 16A MCB with the lights/fan in the kitchen, bathroom and 3rd bedroom. From what I understand light points use 1.5mm wires, so are the wires being overloaded now? So far no problem. The heater was fixed 5 years ago by the shop people. Another thing, all my light points use 16A MCB, while sockets use 20A. Should I change the 16A MCBs to something lower or it doesn't matter? |
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empoleon
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Oct 17 2021, 10:57 PM
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Getting Started
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QUOTE(ceo684 @ Oct 17 2021, 10:23 PM) Lights should be C6 (6A) for safety. I don't think the installer would ever use 2.5mm for light circuits. MCB must be rated lower than the cable safe load. I suspect the WH is running on 1.5mm if its tapping into the light circuit if the WH circuit was not originally built in (wrong). Shop ppl wont care.."not my house syndrome" This confirms my doubts. I wanted to DIY replace the heater but saw all these mistakes. One more thing. I have another water heater, this one has its own circuit and is using a 16A MCB. Everytime the heater is used there's a buzz coming from the MCB. This has been going on for over 7 years. 2 years ago I changed the water heater to a new one and the buzz still happens. The installer said it's normal. Is this really normal? I suppose I can get the MCB replaced as the next troubleshooting step but keen to hear your experience on this. |
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empoleon
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Oct 18 2021, 01:24 PM
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Getting Started
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QUOTE(ceo684 @ Oct 17 2021, 11:53 PM) Weird sounds are indicative of overload (close to redline) or loose connection. What MCB brand are you using? It'll be good to check your cable sizing whether 1.5mm or 2.5mm...the former looks very thin. You can off the whole DB to check safely. The cable going out from MCB controlling WH should look like the sockets one..NOT like light circuits. MCB brand is UMS. Wires are 2.5mm and the screws are tight. I think I'll get a wireman to pull new cables to both the heaters. Maybe install RCBO also. |
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