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Hi, I have two kinds of LED lights (some colour changing ones and some roof terrace ones), they all work perfectly when I connect them directly on the main, but they make my 30 mA RCB trip. Any idea why? Is there a cure?! Thank you.

LOL. Well, the least I can say is that it's not very clear. Anyway, I think I'll do what Andy suggested. I'll install a double pole switch near the water heater out of reach of the guests (probably in the false ceiling) so that anybody working on it can fully isolate the heater. I'll leave it...

It's not related to the manufacturer, but to the country. In England one must install a double pole switch, unlike in other European countries. I'm based in Malta, where they use the same regulations as in the UK, so I have to install double pole switches.

Excellent idea! Best of the two worlds actually! Thank you.

Well yes I could do that, but I would prefer avoiding it. Since the guests won't be able to use it because they won't have the key, what's the point of even having one inside the bedrooms (apart from what you said earlier being able to make sure that nobody switches it on while it's being...

No I don't want the guests to be able to switch them off (and the models I intend to install don't make noise). I already have the problem now in short term rental apartments, people switch them off either because they think it's a nice thing to do it when they leave or because they don't know...

OK fair enough, but frankly every time I've seen electricians working on a water heater they would also trip the breaker to make sure  no electricity was running anywhere!

I used the word Timer to make it more simple, but in fact it's going to be a zwave switch (I don't know if you're familiar with this protocol) connected to a home automation box. It will allow me to switch off the water heaters - and towel heaters -  remotely if the room is not used for some...

So if this person switches off a double pole MCB in the distribution board instead, it's exactly the same isn't it? 

It's a small guest house (6 bedrooms), but I want to make sure each room has its own water heater to 1) save water, 2) avoid that all all rooms have no more hot water in case the centralised  water heater fails.

OK fair enough. What I don't understand though, is that in my opinion, it makes more sense to be able to easily switch off a water heater from the DB rather than from a key switch (especially in case of emergency: you first need to run to the reception, find the appropriate key, go up again, and...

Thank you for your reply. Actually they would not be switched on and off all the time, but constantly on (except on very rare occasions when an intervention is needed for example) as they will be on a timer switch. So really a double pole switch is totally useless in my case - if not to comply...

Yes it is, but it's a hotel, so I don't want to guests to mess up with the water heaters. Is it really a requirement, or is it because "you like to see them close and accessible?"  Thank you. Sorry: "I don't want THE guests" not "TO guests" obviously!

Hi, I'm currently working on the wiring of a small guesthouse and I'd like to replace the usual double pole switches with double pole MCB's - directly in the distribution board. The reason is that I don't want the guests to switch off - or on - the water heaters and I want to keep total control...