I suppose they try to put the blame onto the electrician. Mine categorically refused to install that garbage. It's a wise move, for he doesn't want to lose his license and even less kill off his customers.I would be interested to know how dangerous they really are. In theory, they should be a safety hazard, but are the manufacturers pulling several tricks which makes them *technically* safe (but also incredibly dangerous if incorrectly installed?)
It's funny how discussions of electrical hazards brings out all sorts of attitudes. Policy here is not to finely distinguish between a mere potential lethal shock hazard, and one that is proven fatal. The potential is quite enough to urge non-usage.Norfindel, if the conditions are ideal to die could you please reference a known death using such units? I don't care how cheap you are or what the laws are in your country, units like that aren't installed if there is a serious imminent risk to human life, potential sure, eminent no.
How likely does that sound? How does the wet environment affect the hazard? Is there any corroboration to the use of the structure to carry current?I'd heard stories that one of their electricians had actually wired up the steel super structure of a hoist to carry live 220, mind you this was in a wet environment. No one died there or was seriously injured.
Is the case so clear cut that an absolute dividing line may be placed? "This circuit will knock you unconscious, but it will never be fatal" - "this circuit will kill you every time".It is in all honesty VERY difficult to get electrocuted even if something is wired so horribly wrong as to make it relatively dangerous.
How does a wet environment effect the hazard? Why would you even ask that question, if you know what electricity is and can do the dangers of a wet environment are apparent. The case of an electrified hot water shower while it is a wet environment is a special case because there is an air gap between the conductor and the water, aside from whatever capacitive storage the surface of the water droplets have there is no charge transfer possible except in very specific cases that are difficult to produce, much like sticking a fork in an electrical outlet (there are documented lethalities concerning that)How likely does that sound? How does the wet environment affect the hazard? Is there any corroboration to the use of the structure to carry current?
In exactly the same way as your quote at the top, what convincing evidence do your have for us of
Is your point that running power along steel framing is:Light industrial/manufactoring environments are by large and far brick walls and concrete floors, often bare. The steel structure anchored into a concrete floor will have no good ground, unless it is explicitly supplied one.
I agree 100%, I didn't say such a thing, the value's I listed were from a noted study. Their values of resistance are calculated from the known environment, and if such measures can be guaranteed to remain in effect non-lethal current flow can be guaranteed not to occur. This is not 100% saftey, there are an unknown number of additional grounds from any given circumstance, but general satety risk can be calculated under known conditions.Taking the position that coming in contact with a live conductor while on concrete because standing on a concrete floor somehow confers perfect safety is unreasonable.
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by Kate Smith