For the minimum calculated dimension for "width" in inches, which value is correct based on the dimensions given for conduits?

In this context, the minimum calculated dimension for "width" is based on specific guidelines for conduit sizing. When determining the appropriate width for conduits, it is essential to account for several factors, including the number and size of conductors that will be placed within the conduit. The National Electrical Code (NEC) provides minimum fill requirements to ensure that electrical conductors are not overcrowded within the conduit, which could lead to overheating or damage.

The value of 34 inches is derived from specific NEC rules regarding the maximum fill for conduits and the need for a minimum spacing that allows for effective heat dissipation and easier installation. As conduit dimensions increase, so too does the capacity to safely carry more conductors without compromising their integrity.

In contrast, the lower values of 15, 18, and 20 inches likely do not meet the NEC requirements for larger installations that necessitate more expansive widths based on the number of conductors and their sizes. Therefore, 34 inches is the correct width required to ensure compliance with safety standards and adequate conductor performance under varying electrical loads.