According to NEC regulations, how is a busway generally structured?

The structure of a busway according to the National Electrical Code (NEC) is typically designed with field-mounted rods or bars. This construction allows for efficient conductance of electricity and offers flexibility in installation. Busways utilize conductors that are often placed in a self-supporting framework, which can include insulated bars or rods arranged to facilitate easy access for maintenance and adjustment.

This configuration enables better heat dissipation compared to other options, which can enhance safety and efficiency in power distribution. It supports higher amperage loads and makes the busway suitable for a variety of applications, especially in industrial settings where space can be a constraint, and adaptability is necessary.

In contrast, options that include insulated wires alone or non-metallic enclosures may not provide the same level of performance or safety necessary for high-capacity electrical installations. Furthermore, an open rail system may lack the needed protection and insulation that a properly structured busway offers, which could lead to safety hazards in a practical setting.