Install the fire lighting distribution box firmly, open the cover of the receiving branch chamber, connect the cable to the wiring terminal through the lead-in installation, connect the surface and internal grounding wire, close the cover after checking, fasten it with. Install the fire lighting distribution box firmly, open the cover of the receiving branch chamber, connect the cable to the wiring terminal through the lead-in installation, connect the surface and internal grounding wire, close the cover after checking, fasten it with. Below, we will discuss the correct wiring methods for an explosion-proof distribution box and highlight key usage precautions. Wiring an Explosion-Proof Distribution Box When installing and wiring an explosion-proof distribution box, it is essential to follow strict safety protocols and national. The National Electrical Code (NEC) Section 700. 10 provides critical guidelines for the wiring of emergency systems. These systems ensure continued operation during power outages, protecting lives and maintaining functionality in key buildings. The requirements are thus appropriately high and require comprehensive knowl-edge of fire creation, fire behaviour and fire avoidance as well as the range of options to. Emergency system circuits supply power to critical life safety loads such as emergency lighting, fire alarm systems, fire pumps, smoke control systems, and essential communication and control circuits.