Answer :
Wooden plugs driven into holes in Mounting or similar materials shall not be used for securing electrical equipment.
Where the conductor material is not specified in the code the conductors are assumed to be?
The voltage taken into account throughout this Code shall be the voltage at which the circuit operates. Electrical equipment must have a voltage rating that is greater than the nominal voltage of the circuit to which it is attached. Unless otherwise stated in this rule, conductors used to carry current typically must be made of copper or aluminum. The sizes listed in this regulation shall apply to copper conductors where the conductor material is not specified.
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