Do not just depend on heater RCD. And some of heater is not RCD but elcb. Most of the heater is using electronic for protection. Electronic do not have long lifespan.

Having few layer of safety protection rather depend on heater. Heater RCD fail, you have another safety device to protect.

There is no specific you can use on what item. Anything that you want to have a second layer of protection, you can install it. I have it install in my kitchen, specific 24hr run light and heater.

ozak Bro, I just bought 2 Hager 10mA RCCB. Do you know how this thing is connected to the water heater MCB in the DB?

This one you need neutral and live wires that connected to the water heater, doubt you can do it on the db box without tracing the neutral wires.

As weikee said, you need to trace the neutral wire out. And sometime this neutral are share with other.

To install, you need to check with 1 of the mcb that connect to heater. The out going of that mcb is to connect to the rccb.

Ini macam.

Thank you sir.
If I install this RCCB at the water heater bathroom main switch instead of DB (with a dedicated RCCB housing/cover), the tracing of neutral wires can be avoided right ?

Yes, that is correct but does not look aesthetically nice only.

Yup. you can use it as switch. Just abit hard to switch ON. Press the blue button to OFF it.

Sorry, the kids diagram for the hager rccd wire numbering abit wrong.

Should be
1-live incoming
2-live out going
3-neutral incoming
4-neutral out going.

Don't put the wiring wrongly into the rccd. otherwise it won't trip.

Not recommend to use as switch, as the on/off function in the RCCB it is not designed to be a switch for daily on off frequently.
Frequently switch off and on can spoil it as well.

RCCB/ELCB can malfunction as well (experienced before, especially those being tripping frequently/switch on/off frequently.

Just install a ordinary switch beside/after the RCCB should be the proper way.

PS: if not mistaken, inside the RCCB, there is spring holding on the switch between the on/off position (that's why it is "hard" to switch on) whereby a difference between live and neutral trigger the tripping function through "springy" function.
So it rely on the spring to function. Frequent switch on/off may "wear' the spring over the time.

This post has been edited by cherroy: Feb 2 2015, 10:20 PM

Did meantion how long for that instant heater must be change?

Also check on ELCB very often right?

My Pana built in pump coming to 9 yrs now

If the instant shower heater comes with plastic hoses (not metal), then you should not need to worry to change.
RCCB should be test trip once a month for best results.

Where can I find this RCD switch? Preferably, a 10mA version. Thx.

http://www.sinchew.com.my/node/1550857/%E7...%94%B5%E6%AD%BB

Another casualty. Water heater used more then 10 years never replace.

http://www.nst.com.my/news/2016/07/160854/...e-taking-shower

From the picture, the water heater is from the tank and not the instance type.

Doesn't matter.

Any heater require high safety protection and change for some yrs as precaution.

storage heaters also can electrocute people? must be really bad wiring. like missing the earth wire ?
can explain a bit?

It can also be solar, remember solar also have storage heater.

Don't know the detail how it happen, could be wiring got bitten by rat, or leaking on the tank that shorted the wires. Many possibilities, hope the press share more details.

This post has been edited by weikee: Jul 27 2016, 04:55 PM

The principle is same. It using heating element heat up the water.

Instant and boiling is just water running while heat up and water staying while heat up.

If your heating element is crack and corrode, electric will still leak to the water.

Other than the heating element is the insulation break overtime, thermostate fail.

I don't remember that storage heater have built in safety trip device.

but surely it will trip the MCB at the switch box right?

That is when the current doesn't leak to the earth. But thru your body.

MCB won't trip with this kind of leakage. The leakage is small enough to kill you. But won't trip the MCB cause it doesn't short.

The only thing will trip is the RCCD or elcb (old house).

There is so many case already that proof the DB side doesn't trip.

That's why secondary protection is important to protect you.

Then these manufacturers should at least warn or give instructions to install it with RCCD

Mine dont use heating elements but heats up the water using condensing coils. I wonder got worries or not? Electricity only runs to the compressor (black thing)