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To ensure safety and compliance with electrical codes, it is essential that conduits be securely fastened with appropriate supports. This requirement is in place to prevent physical damage to the conduit and the electrical wiring within it. Proper support helps maintain the integrity and stability of the conduit system, minimizing the risk of displacement or stress on the conductors which can lead to short circuits, electrical failures, or even fire hazards.

Codes typically require that conduit be secured at specified intervals to support its weight and prevent sagging. This adherence to code is vital for both the longevity of the system and the safety of those who may be interacting with the electrical infrastructure.

Other options do not align with safety and compliance standards. For instance, burying the conduit under soil may not ensure it meets code requirements unless specified for certain types of installations. Loosely stringing conduits does not provide any protection from damage and would violate essential safety practices. Finally, the material of the conduit must meet specific standards based on the application and environment, which means choices cannot be arbitrary. Each of these factors further emphasizes the importance of securely fastening conduits as a fundamental practice in electrical installations.