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SFGTV2 October 31, 2011



here we are in some air where there is low-vot ago wiring used for communications. we have two kinds of wire. we have line voltage and low voltage. what is the difference between those two types. the low-voltage wiring doesn t present a shock hazard. you don t have to put the wires in a conduit or a cable. this is thermostat wire. it s called class two wire. when you have a class two transformer, you re allowed to run this cable either exposed or concealed in building construction without a cable. there would be an example of some similar. this would be computer wire and in a lot of new houses now that the people are putting the computer wire and telephone wires, as low as the thermostat wires in the walls and they don t have to use conduit or cable. all different colors. are there standards for what colors you use? is brown always used for thermostat wire? no code requirement. just a manufacturing requirement. all different colors. the only restriction that som ....

United States , City Of , United Kingdom , New California , San Francisco , Greg Pearl ,

SFGTV2 October 24, 2011



radio frequency on them. what kind of wires would impose a radio frequency? it could be a computer, another computer, it could be the microwave oven. you want to separate is from any other ideally. if you re running your wires in a raceway or an armored cable that uses ferrous metal, that protects those conductors against these radio frequencies much better than nonmetallic cable. that would be another strategy. and then if you re in a commercial installation where it is really, really important, you put in isolation transformers adjacent to the equipment. that s the most expensive solution but the best solution is to actually put an isolation device right at your equipment. they also have filters that you can buy, but that s a commercial-grade installation. residentially, a dedicated circuit, try to separate it from other wiring to the extent possible. anything you might want to add to that? yes, they re called a clean circuit. you use the m.c. cable or 1 ....

United States , New California , San Francisco , Greg Pearl ,