ten lights per curcuit
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Circuit loading
In Canada there shall be not more that 12 outlets on any 2 wire branch circuit. Such outlets shall be considered to be rated at not more that 1 amp per outlet. Where the connected load is known, the number of outlets may exceed 12 providing the load current does not exceed 80 % of the rating of the over current device protecting the circuit.
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voltage is measured by voltagd drops. When a switch is open/ off there is a voltage difference between one side to the other. when the switch is on there is no drop from one side of the switch to the other. That is normal operation. If switch is on, and you get a voltage reading across the switch, the switch is bad.
Three way switches do not have a up-on down-off position. With the lights off, reposition the switches so that the handles are all down. This is the start position and depending on how you enter the room and turn on the lights certain switches will be left up when you leave the room. That is just the design of the switches and for the asthetics of the look, all handles down the lights will be out.
Yes, you need to turn off the power when you change (replace) a light switch, since at least one of the terminals on the switch will always have power if the circuit is energized at the panel.
The number of poles refers to how may separate signals or if you will, wires you switch when the switch is activated or deactivated. For example your typical light switch just switches the hot wire and turns the light on or off and is called a SPST switch. The SPDT switches a signal to either of two circuits. So for example, if you had hot connected to the input and a light connected to each output (Throw), you would have one light on and one off and each time you throw the switch the lights switch which is off and which is on. The DPDT can switch two separate signals at the same time and each goes to one of two separate circuits. If you had two separate breakers and four light bulbs you could hook up one breaker hot to one pole and the other breaker to the second pole. If you had four light bulbs each connected to each of two switch outputs, then one bulb from each breaker would be on and when switched the other bulb on each breaker would be on. For diagrams just search for SPDT and DPDT.
Hard to know what you are meaning? A timer is a device in a circuit that switches on then off at given times. There may be many on/off operations not just the one. Think of some lights, say street lights that come on at a certain time then off at a later time. If they are electric that would fit you question. Although the lights are more likely controlled by darkness at dusk and first light in a morning. G4CIR