THHN Cable Applications in Power Distribution Cabinets and Control Boxes
Power distribution cabinets (e.g., GGD, MNS, XL-21) manage electrical distribution and protection, housing both high-power primary circuits and low-voltage secondary circuits. THHN cables are primarily used in secondary control circuits and select primary wiring scenarios:
Secondary Control Circuit Wiring: THHN is the go-to cable for control circuits involving breakers, interlocks, and signal feedback systems. Its 600V rating and thin insulation allow compact, multi-circuit routing within tight cable trays .
Component Termination: Devices like relays, meters, and contactors rely on THHN for secure terminal connections. Its flexibility ensures stable, vibration-resistant terminations with cold-press connectors .
Short-Run Primary Circuit Links: For low-current (≤32A) primary circuits, such as connections between miniature circuit breakers or fuses, THHN provides a reliable, space-saving solution .
Internal Power Distribution: THHN efficiently routes power from sources (e.g., switch-mode power supplies) to modules and instruments inside cabinets, thanks to its small diameter and robust insulation .
