Didn't see my own place blackout every 2-3days its a myth

1. Modern 30mA = Never tripped except for severe thunderstorm (wind howling type). Maybe once/twice a year at most, not every single rain like the old 300mA we had.
Whole SG also using 30mA don't see blackout all the time.

2. Very costly. For what follow ER1994 spec identically when we can go tighter without problems.

Just don't cheap out on RCD can liao. Get ABB/Hager (with anti nuisance trip)

This post has been edited by ceo684: May 12 2023, 08:51 AM

Ok except the last one use 40A 0.03A


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Actually on second thought. Why not just use a single 63 0.03 RCD since it’s on single phase. There is no need to split DB.

It’s because the neutral group of circuits on RCCB A should not be mixed with neutral group of circuits on RCCB B before passing the “checkpoint”.

Mixing your neutrals BEFORE the RCD "checkpoint" has different implications.

U know how shops like genki sushi and sushi king charge for per-plate kaiten belt sushi?
RCD operates like u eat, u pay for your plate tower.
Now let's say I eat, I don't know you, but I put my plates into your table.

This post has been edited by ceo684: Oct 5 2023, 01:52 AM


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Yes the FH202 terminals are bidirectional from the diagram 1/2 2/1

SH201 without L better.

Old MCB u need to check for fakes as well. Since new MCB not expensive rm 8 a piece I would go for new “peace of mind” for 30 years

4.5kA vs 6kA short circuit withstand.

Yes FH202 L&N ok one.

Traditionally MCB is line at bottom but ABB one bidirectional. Ok.

L is slightly cheaper.
The barang cost only 50c or rm1 a pc difference. I don't bother using 4.5ka SH201L because the small diff use 6kA SH201 better
The SH201L one is when "every cent is a problem" case when client very tight for money but its not worth stocking..

16mm x2 in that almost impossible to fit.

U forgot the up to.
Also note per each water heater = need its own unique unit of 10mA. Three WH = 3pcs 10mA.



Also note that this is 30 year old regulations (ER 1994) in the era of flourescent tubes and window-box type aircon in 2023 one piece 30mA bao kah liao is perfect. Save space. Save time.
It is also illegal w.e.f July 2023 in SG to use anything other than a 30mA RCD for the main RCD. This is for safety reasons.
 Circular_RD_E01_2023_ELISE.pdf ( 247.6k ) Number of downloads: 26



By right should be protected by 2 pcs of 40A MCB if 2 pcs of 10mm cable is used.
A 63A main switch does not protect any of the 10mm cable.
Going by principle of either FUSE PROTECT CABLE = OK and CABLE PROTECT FUSE = 🔥 this should be better managed especially by the tradespeople

Loose cut (cut by 1m lengths) mega kabel 16mm only few ringgit even to order in the correct multi colours Red Yellow Blue Black..

** sorry, am typing on laptop quite hard to do the alt 0178

This post has been edited by ceo684: Oct 14 2023, 12:38 AM

Just a way of saying 2-in-1 coffee sachet vs separated coffee and creamer sachets; IRL dedicated functionality RCD+MCB is preferred (cheaper by approx half price of a RCBO) unless there is space constraint

This post has been edited by ceo684: Oct 14 2023, 12:41 AM

Correct. This ST guideline still based on ER1994.

I’m not in favour of this because it only has CE shiok sendiri mark. It’s not a proper Sirim or equivalent certification.

Yup all good 👍

Usually human die at 50mA.
300mA mean u kena hexa killed (6x killed).
30mA will stop it before major damage occur to your heart.

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This post has been edited by ceo684: Feb 6 2024, 11:07 PM

I prefer option 2. I don't prefer to share because the WH itself consume a big chunk of amperage by itself.

Isolator don't have overcurrent protection, but you can just add in another 63A 2P MCB after it. Followed by the RCCB.