Following the principle of "left zero, right fire, ground wire", the distance between strong and weak electrical terminals should be ≥ 50mm Multiple wires need to be tinned before crimping to avoid oxidation and increase in contact resistance Identification managementFollowing the principle of "left zero, right fire, ground wire", the distance between strong and weak electrical terminals should be ≥ 50mm Multiple wires need to be tinned before crimping to avoid oxidation and increase in contact resistance Identification managementIn this guide, we'll break down everything you need to know to install a distribution box correctly and confidently. Choose the right box based on environment (indoor/outdoor), load capacity, and durability. Check for proper IP/NEMA ratings and material quality. Ensure safe placement: install in. This code is based upon the type of box, wires, wire sizes, wire clamps and conduit fittings. Adjustments are made for the ground wire as you will see in the table below. Electrical Tips and Be Sure to Subscribe! Part (1) of Section. A distribution board or distribution box is where the main power supply is distributed to multiple loads. I believe I should be using table 312. Can someone one. This is the length of conductor that is connected to each terminal during the heat-rise test required by the Ex e equipment standard, so if we do our calculation the same way, we will be consistent with the type test carried out during the equipment certification process. The conductors shall be run as multiconductor cord or cable assemblies or within raceways; or, where not subject to physical damage, they may be run as open conductors on insulators not more than 10 feet (3.