The first system to protect people from the hazards of coming into contact with a live conductor was a high sensitivity earth leakage system and was an item known as a magamp. The magamp was developed by Henri Rubin for a company called FWJ Electrical Industries in South Africa, where the electrical hazards of the gold mines with their miles of cables in damp wet conditions made life difficult. Rubin initially developed a cold cathode system in 1955 which operated at 525 volts and...
In domestic markets, consumer units will usually only have a limited amount of circuits and can manage with a limited number of outlets. However once a consumer unit heads into the commercial or industrial market, the number of circuits required can rise quickly, and the type of usages can be specialised to the manufacturing unit. A 36-way high integrity metal consumer unit is the system that is typical of the sort aimed at the industrial consumer unit market.
It's a nice thought if you could do the concrete work around your home all by yourself but the reality is, in most cases, this type of work is best left to a professional. Sure, you know someone who did a decent do-it-yourself concrete patio, but the phrase "If he could do it, I could too" doesn't always work in this case.
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