What is the required concrete coverage depth for flat top underfloor raceways between 4 and 8 inches wide?

The required concrete coverage depth for flat top underfloor raceways measuring between 4 and 8 inches wide is 1 inch. This requirement is established to ensure adequate protection of the raceway against physical damage and to maintain proper structural integrity.

Having a coverage depth of 1 inch is sufficient for these raceways as it aligns with standard practices in electrical installations where raceways need to be embedded in concrete. This depth helps to prevent any potential interference with other services, as well as ensuring compliance with safety regulations and codes.

Such a specification also takes into account the mechanical properties of the concrete, enabling it to provide enough support for the raceway while preventing unnecessary strain or stress on the raceway materials themselves. Understanding this requirement is crucial for anyone involved in electrical installations, particularly in managing underfloor systems effectively.