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Apr
19
comment Are water boilers dangerous when showering?
@user1751825 For such and similar reasons, more and more people are trying to do as much plumbing and electrical work they can on their own, with rationale that even if they don't know how something works, at least they aren't intentionally trying to kill themselves!
Apr
19
comment Are water boilers dangerous when showering?
@user1751825 From my experience, huge number of tradespeople fit into the category I just mentioned: Switching between trades as the market demand changes. This leads to many people having big distrust into tradespeople and the quality of their job. I've heard of cases where power company electricians would just cut neutral to work on electrical installations, leaving the 3 phases connected. I've had a power company electrician, working on the power meter,connect a phase wire to the neutral socket of the meter, giving me ~400 V instead of 230 V, with very healthy results to my appliances.
Apr
19
comment Are water boilers dangerous when showering?
@user1751825 Are they allowed? I don't know! That's the issue! In practice, people do things on their own. Despite searching for quite some time, I was unable to find any licensing system for tradespeople at all, so if it does actually exist, it's not very transparent. From what I can see, they get their 3 years of "qualification" in high-school and then just work. This has lead to a number of people "proclaiming" themselves to have finished trade-school and just doing the job, even if they don't.
Apr
18
comment Are water boilers dangerous when showering?
@Joe Well I'm not sure if we have a good stack exchange site for this question. I mean, the electrical engineering site is mostly about electronics, with few power engineering questions. Maybe the general engineering site might be better? I don't usually visit it, so I can't say for sure.
Apr
18
comment Are water boilers dangerous when showering?
@Joe Well that's a big point of this question, I think. In general, people don't actually die, well except for that one example I know of, they just feel a tingle and hopefully do something to solve it. The tingling could be doing its part to maintain the myth.
Apr
18
comment Are water boilers dangerous when showering?
@Just a quick comment about the part number one: We do have somewhat hard water and this results in collection of scale deposits in the vicinity of the heating element. The tanks themselves are almost always conductive, usually made of copper, nickel-plated copper or chrome-plated copper. You can see here for example usual amount of scale that collects near a heating element. I myself don't know how it would affect conductivity.
Apr
18
comment Are water boilers dangerous when showering?
@Joe In general, descriptions I've read of bathroom issues usually don't describe strong shocks. Instead, it's usually tingling or pins and needles sensation when standing on the floor with bare feet or when touching something else. This leads me to believe that the voltage drop across the bather is much lower than the nominal 230 V.
Apr
18
comment Are water boilers dangerous when showering?
@Joe In Serbia, usual shower head is mounted at an end of a flexible hose and usually the pressure is high enough to produce continuous stream of water and not just droplets. Furthermore, the "hose" part does its own to encourage use of the shower head at very close range, so there is usually a full stream of water between the shower and the bather. Another issue can be not so good grounding between different parts of the bathroom. Quite often, there's a central heating installation that's grounded within reach of the bather, which can be dangerous.
Apr
18
comment Are water boilers dangerous when showering?
@FreeMan Actually, that's the temperature probe of the thermostat. If I remember correctly, it's usually just showed in the tube. In any case, I do agree that some more insulation would be very welcome.
Apr
18
comment Are water boilers dangerous when showering?
@JDługosz For boilers, well they are usually energized before actual hot water is needed or at night, during "off-peak" electricity price. The issues usually manifest as a non-working heating element. Afterwards, during heating element replacement, often other maintenance is done as needed to the boiler, so if there are any loose wires, that tidied up and so on.
Apr
18
comment Are water boilers dangerous when showering?
@JDługosz I'm not sure how to respond to that. The usual publicized reports are either of people getting killed in electrical fires in discos, which happened a few times in the last several years, or people getting killed while trying to steal energized railway high-voltage electrical installation material to re-sell as scrap metal. It's been some time since I've heard of actual injuries from home electrical installations. Maybe everyone is just careful?
Apr
17
comment Are water boilers dangerous when showering?
@Jimmy Fix-it Well, yes, I do indeed think that it is at least a bit unsafe to have a shower with the boiler energized, using a typical Serbian installation. On the other hand, people are using "suicide shower heads" every day and not actually getting killed on their first shower, so I do understand why OP would want to have a myth debunked as well.
Apr
17
comment Are water boilers dangerous when showering?
Unfortunately, in Serbia, it's quite common not to have GFCI and quite often the heaters are left ungrounded.
Apr
17
comment Are water boilers dangerous when showering?
@NeoXx Well I'm from Serbia too and I did actually have a distant relative die from bad water boiler installation. Unfortunately, I was unable to find out the specifics of the actual installation fault.
Jan
10
comment Acceptable ground to neutral voltage?
@Tester101 About the other comment: We have a bit different terminology, but I think that I'm talking about neutral to ground voltage. Here I have a TT grounding system and the ground conductor I'm talking about is connected to the electrode array berried in the ground. I'm not sure how EGC in this kind of set-up would be different from ground.
Jan
10
comment Acceptable ground to neutral voltage?
@Tester101 I'm not worried about cows and I don't have any. In that comment, I just mentioned what some articles I've read say about acceptable neutral to ground voltages and some of the problems the articles mention when neutral to ground voltages are higher than values mentioned by the article.
Jan
10
comment Acceptable ground to neutral voltage?
This is much closer to what I'm looking. Thanks!
Jan
10
comment Acceptable ground to neutral voltage?
Please read the question before answering.
Jan
8
comment Acceptable ground to neutral voltage?
But I'm asking for exact values.
Jan
13
comment Ethernet cable instead of Thermostat wire?
I've seen 230 V AC used for thermostats. Would CAT 6 do fine even for that?