1, hard copper-core wire:
BVV - polyvinyl chloride insulated and sheathed copper-core wire
BV - polyvinyl chloride insulated copper-core wire
BX - rubber insulated copper-core wire
2, soft copper-core wire:
BVR - polyvinyl chloride insulated copper-core soft wire,
RHF - neoprene rubber sheathed copper core soft wires.
Oxygen chamber wires are often used BV, BX, RV, RVV series of wires, which:
L: Fire (red wire)
N: Zero (blue wire)
PE: Ground (yellow and green wire)
Expanded
1, with the color differentiation : in the power cable yellow green red respectively on behalf of phase A phase B phase C (three-phase firewire) blue on behalf of the zero line, yellow and green two-color on behalf of the grounding wire.
2, with the electric pen to distinguish: the fire wire with electric pen test neon tube will glow, while the zero line will not.
3, with a voltmeter to distinguish: the voltage between the different phase lines (i.e., the fire wire) for the line voltage of 380V, phase line (fire wire) and the zero line (or a good grounding body) for the phase voltage of 220V, the zero line and a good grounding body for the voltage is 0V.