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When it is impossible or very difficult to install a standard coupling on RMC, what should be used?

Answer :

Final answer:

When standard couplings cannot be installed on a Rigid Metal Conduit (RMC), alternatives such as set-screw couplings or compression couplings should be used. These can be installed in tight spaces or difficult-to-reach locations and offer different levels of protection based on the situation.

Explanation:

When a standard coupling is challenging or impossible to install on a Rigid Metal Conduit (RMC), an alternative solution is to use a set-screw coupling or compression coupling. These types of couplings are secured to the conduit via screws or compression fittings, and they can be more easily installed in hard-to-reach or tight spaces where traditional couplings cannot fit or be manipulated effectively.

For instance, set-screw couplings are commonly used in dry locations where the conduit is not exposed to damage, and they require a screwdriver for installation. On the other hand, compression couplings are typically used in wet locations or where the conduit may be susceptible to damage, as they provide a more secure and moisture-resistant connection.

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