"Travelers" are the two switched wires running between three-way (or four-way) switches to operate lights from multiple locations. Depending upon circuit configuration (swx/swx/lt or swx/lt/swx), the third wire in a "3-way" cable could be either "hot" or "neutral" at all times and the bare copper wire is always an equipment grounding conductor.
Conduit is not required for residential electrical IF THE WIRING IS BEHIND THE WALL. If it's exposed wiring, you'll need to use conduit.
Can feed two separate 15 A circuits.
Given the choices: 568a; 568b; 570; and 802 I believe the answer is 570 The description of 570 using the term "residential" can be found: http://www.linktionary.com/t/tia_cabling.html
Style Y wiring refers to a specific method of wiring smoke detectors in a fire alarm system. In this configuration, detectors are connected in parallel, allowing for multiple devices to share the same circuit. This wiring arrangement is commonly used in residential and smaller commercial buildings.
30 amps is often the limit recommended for standard residential wiring on a #10 copper wire. You are correct.
"feed" is the incoming power in relation to residential wiring.
Residential wiring is the process of placing electricity in a person's home. In order to do this in the United States, you must be a licensed electrician.
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Copper
In U.S. residential wiring it is 240 volts.
In basic the load is commonly referred to in relation to the outputs required by that circuit. i.e. How many x wattage lamps will, as a maximum be on a circuit. therefore the term 'load' may refer to the power consumed by a circuit
Conduit is not required for residential electrical IF THE WIRING IS BEHIND THE WALL. If it's exposed wiring, you'll need to use conduit.
red = phase, black = neutral, green = earth
In residential wiring the white wire is neutral on the 120 volt circuits. On a 3way circuit the red is the traveler and the white is neutral. On a 240 volt 3 wire connection the white & black are hot. On a 240 volt 4 wire connection the black and red are hot and the white is neutral.
Can feed two separate 15 A circuits.
In residential wiring, if it is used as a switch leg or in 3 wire 240 volt circuits.
The most commonly used wiring method for residential use is called nonmetallic sheathed cable. Other types of wiring methods are knob and tube, as well as service entrance cable.