Building wiring under the US National Electrical Code and the Canadian Electrical Code is identified by colors to show energized and neutral conductors, grounding conductors and to identify phases.
22.
Not all installations distinguish the live ( phase ) and neutral conductors, and reverse wired sockets are quite common, so double pole breaking RCDs and main switches are recommended.
23.
Some jurisdictions prohibit the use of shared neutral conductors when feeding single-phase loads from a three-phase source; others require that the neutral conductor be substantially larger than the phase conductors.
24.
In 240-volt applications not requiring a neutral conductor, the white wire may be used as the second hot conductor, but must be recolored with tape or by some other method.
25.
Some jurisdictions prohibit the use of shared neutral conductors when feeding single-phase loads from a three-phase source; others require that the neutral conductor be substantially larger than the phase conductors.
26.
This saved on copper costs since lamps were connected in series on a 220 volt system, with a neutral conductor connected between to carry any imbalance between the two sub-circuits.
27.
The connectors are equipped with protective earth ( PE ), a neutral conductor ( N ) and three phase conductors ( L1, L2, L3; formerly : R, S, T ).
28.
When a solar flare reaches the Earth, utilities sometimes experience hundreds of volts and hundreds of amperes through neutral conductors when the transformer neutral is grounded at each end of the line.
29.
Here, the harmonic currents feed on each other, multiplying so that they can exceed the capacity of that neutral conductor long before the actual power capacity of the entire system is tapped out.
30.
Instead, they explicitly forbid configurations that might break continuity of the neutral conductor, unless all associated hot conductors are also simultaneously disconnected ( for example, with ganged or " tied " circuit breakers ).
