May 2, 2024 The NFPA* National Electric Code requires branch circuit wiring and fusing whenever the electric load exceeds 48 full-load amps. This provides over-current protection and can facilitate heater wiring.
The UL-Listed branch fuse box includes a power distribution block (to facilitate wiring to any number of branch circuits,) the branch fuses and terminal blocks for the wiring of multiple over-temperature protector devices.
The branch fuse box also facilitates the wiring of a large number of heaters. For example, when you are wiring four 3-phase heaters, you will have to connect twelve heater power wires plus eight lead wires for the over temperature protectors. The main switching contactor in a temperature control box can only hold two wires per connection.
