The external screw contacts of screw type lamp holders should always be connected with

Question

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from the earth wire of the circuit

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from the switch wire of the circuit

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from the phase wire of the circuit

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from the neutral wire of the circuit

1.	The external screw contacts of screw type lamp holders should always be connected with
A.	from the switch wire of the circuit
B.	from the phase wire of the circuit
C.	from the neutral wire of the circuit
D.	from the earth wire of the circuit
Answer» D. from the earth wire of the circuit

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