Literally got shocked last night when I was using the shower. Mine is a steel shower set type. Got zapped when I touched it!

Tested with one of those electricity meters, definitely got current. WTF. Anybody else had this problem before? I've got a Joven water heater installed above the ceiling. Is it caused by the heater or something else? Don't know if it's related or not but a few days ago switching on another water heater keep tripping the whole house (also the same model JH25).


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high rise or landed?

Well, condo but mine's only 6 floors, I'm on the ground floor.

I believe is landed with central water heater.

Personally I'll suggest TS to change into wall type for each toilet.

this means got some leak in your wiring....

ELCB test button ok?

Errr, mine got no ELCB button like those wall mounted type.

You are fortunate that you are still alive. Go get licensed wiremen to check the wiring & compliance to ST guide for the water heater installation.

There is a leak in your wiring.

Hopefully you have had a 10mA dedicated RCCB with its dedicated wiring installed for the water heater only, as it is crucial in saving lives.

ELCB from your heater will not detect leakage OUTSIDE the WH so the RCCB is important.

Thanks for the input, have first asked the Joven technician to come take a look. Then will ask an electrician to double check. Got a phobia now touching anything metal that's connected to an electrical connection.

Sorry, a bit of a noob re: electrical stuff, what's this ST guide you mentioned?

Thanks for the input! Will definitely look into this. Found a thread that seems to be talking about what you're suggesting..

https://forum.lowyat.net/index.php?showtopic=4938749&st=

There's a latest guideline from ST
https://www.st.gov.my/en/contents/files/dow...N_DOMESTIK1.pdf

https://www.todayonline.com/singapore/elder...-heater-1841166

You are lucky didn't get electrocuted to death. This news article of a case in Singapore has some technical explanations of how it can happen.

Thanks for the link. Yes, lucky indeed.. read the article, although slightly different from my case, but the thing to take note is this:

Ok guys, really thanks for all the input, just wanted to update for everybody's future reference because this was scary AF. So this is what actually happened.

Got the Joven technician to come over and check, turns out it is the heater element that was spoilt. But usually if this happens, turning on the water heater would have tripped the current box. However it did not, instead the current was running through the copper piping then into the steel shower head. F*ck.

So, got heater element fixed and then got my electrician to come take a look to find out why it didn't trip as it should have. Turns out the ground wire for the water heater was not connected to anything! This one is probably due to my previous crappy contractor who did my reno who also installed the water heaters. Was a vomit blood experience but that's another story.

What the electrician did then was to connect the ground wire from my nearby air ventilator to the water heater's ground wire so in future should trip if anything goes wrong. He says should be safe enough. But can also do further precaution by installing RCBO for the water heater at the current box.

Sorry if I have wrongly described anything as my electrical knowledge is nil. Anyways I'm considering getting these RCBO models, all got various prices... any advice?

https://shopee.com.my/%F0%9F%86%9ACHINT-NXB...77-d1d65bb4a703

https://shopee.com.my/MAXGUARD-20A-32A-2P-1...b3-07b2a2953144

This one is the cheapest, but... is it any good?
https://shopee.com.my/CNC-YCB9NL-40-230V-RC...fb-5b0e8b96535e

If going for RCBO get the Schneider one - around RM130. Better still if your DB box has sufficient space, get RCCB 10mA from ABB or Hager, its around RM150 for ABB and RM190 for Hager. If using RCCB, you still need a MCB.
Don't cheap out on breakers and RCDs.

Only the middle one, Maxguard, is the correct specifications for a water heater at a sensitivity of 10 mA or 0.01 A

i think the shower head and hose cant use metal one ...

need change to plastic/rubber

Fully agreed, all water heater must install along with RCCB or RCBO, this is to add second protection measure, if the first protection failed like TS said, then second protection will save your life. a good quality RCCB with installation just cost less than RM500, your life is definitely worth more than RM500.

Ok, thanks! Will look into the Schneider ones... sorry noob question, not sure if I have a MCB? This is my DB box currently...



This post has been edited by subaiku: Jul 20 2022, 10:47 AM