In 1901 a Metropolitan and District joint electrification committee recommended a three-phase conductor rail pickup similar to that in use on the City & South London Railway and Central London Railway.
12.
The ADSS cable is suspended in the electrical field due to the phase conductors; this varies from a maximum at mid-span to zero at the grounded metal supports of the cable.
13.
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.
14.
A semi-flexible tower is designed so that it can use overhead grounding wires to transfer mechanical load to adjacent structures, if a phase conductor breaks and the structure is subject to unbalanced loads.
15.
The connectors are equipped with protective earth ( PE ), a neutral conductor ( N ) and three phase conductors ( L1, L2, L3; formerly : R, S, T ).
16.
As of March 2011, the European Committee for Electrotechnical Standardization ( CENELEC ) requires the use of green / yellow colour cables as protective conductors, blue as neutral conductors and brown as single-phase conductors.
17.
There could be a sneak circuit through another appliance which put some voltage on the phase conductor which you isolated from the mains by opening the breaker . talk ) 03 : 34, 15 January 2008 ( UTC)
18.
As for grounding, the neutral ( or the phase conductor, for that matter ) is not exactly floating with respect to earth-it always has " some " defined potential ( wildly varying, probably ).
19.
Although no phase conductor is directly connected to ground, a specially constructed transformer ( a " zig zag " transformer ) blocks the power frequency current from flowing to earth, but allows any leakage or transient current to flow to ground.
20.
In the UK where some supplies to rural property are converted to PME / MEN from TT Earthing system concerns have been expressed that the lower conductor alone may be broken, ( by high vehicle or falling tree for example ) but with the upper phase conductors intact.
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