Besides the resistivity of the wire (which changes with the diameter), the insulation on the wire determines the amount of current it can carry. This derating happens due to excessive heat surrounding the wire. However, know that when more than three wires are installed in a conduit, they will carry less current than they are capable of when only one is installed. Wires installed inside conduits can get away with resistance to high heat due excellent insulation properties (Example: THHN insulated). They should be rated to handle both heat generated by the current and resist degradation due to moisture content in the soil. 
In direct bury applications, cable insulation is an important parameter to consider. Conduit Terminations at Junction Box 1. Conduit InstallationĪfter determining the right approach to laying wires, a good amount of engineering work is involved in determining the following: distribution) dictate which method is the most suitable. 
Site conditions, project funding, and the type of substation (bulk power vs. The process of laying wires can be as simple as directly burying them in the ground (depending on the cable jacket) or when necessary, pulling them through a conduit. If the relay is installed at a remote location like a control room then you need to lay down wires from the relay to the location where the equipment is in the yard.
Substations contain equipment that are controlled by relays.
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