In standard electrical wiring color codes, different colors are used to identify wires for safety and ease of installation. In older wiring standards (like the previous Indian and UK standards), the color code for mains electricity was typically: Red for the Live wire, Black for the Neutral wire, and Green for the Earth wire. While newer standards use Brown for Live and Blue for Neutral, black insulation is commonly found in existing installations as the Neutral wire. The Live wire carries the voltage from the source, the Neutral wire provides the return path for the current, and the Earth wire is a safety ground.
A wire with black insulation during electric supply is
Asked in CGPSC Prelims Exam 2014 · Topic: Electric Current (Ohm's Law, resistance, resistivity, and conductivity)
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