When a metal wireway contains splices and taps, to what percentage should it not fill the wireway at that point?

A metal wireway is designed to house electrical conductors and allows for splices, taps, and appropriate terminations within its confines. When using a wireway that accommodates splices and taps, it's crucial to maintain a certain level of safety and functionality regarding space management.

The correct percentage of fill in a wireway that contains splices and taps is specified as 75%. This guideline ensures that there is ample space for air circulation and heat dissipation, which is critical for preventing overheating of the wires due to electrical current flow. A 75% fill limit allows adequate room for safe operation, reduces the risk of damaging the insulated conductors, and facilitates easier accessibility for maintenance or future adjustments.

Greater fills can lead to a multitude of problems, including increased heat buildup, which can compromise the integrity of the insulation and increase fire hazards. Therefore, maintaining the fill at or below 75% in scenarios involving splices and taps is essential for ensuring the long-term safety and performance of the fire alarm and electrical systems.