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Which of the following are permitted to be buried in a trench underground? The wiring will be covered with stabilized sand to prevent physical damage.

a) NM Cable
b) RMC
c) Type MC Cable
d) PVC Conduit

Answer :

Final answer:

Rigid Metal Conduit (RMC) and PVC Conduit are specifically designed for underground installations, offering protection against physical damage and harsh conditions, making them the permitted options for burial in a trench covered with stabilized sand.

Explanation:

The question asks which of the following options are permitted to be buried underground in a trench, with the wiring to be covered with stabilized sand to prevent physical damage: NM Cable, RMC, Type MC Cable, or PVC Conduit. In the context of electrical installations, certain types of conduits and cables are specifically designed for underground installation, taking into account factors such as moisture resistance, durability, and protection from physical damage.

RMC (Rigid Metal Conduit) and PVC Conduit are commonly used for underground installations because they offer significant protection against physical damage and are designed to withstand harsh underground conditions. RMC is known for its strength and durability, making it suitable for direct burial. Similarly, PVC Conduit is designed for use in underground applications due to its resistance to corrosion and moisture.

On the other hand, NM Cable (Nonmetallic Sheathed Cable) is not designed for outdoor or underground use unless it is in a conduit and protected from physical damage, which makes it less preferable for direct burial, even with sand protection. Type MC Cable (Metal Clad) can be used for certain underground installations when properly protected from corrosion and damage, but specific installation requirements must be followed.

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Rewritten by : Jeany