Panel Feed Wire, Panel feed cables are generally black insulate THHN wire.

These are use to power the main junction box and the circuit breaker panels.

Just like main power feeder wires, the cables should be a rate for 25% more than the actual load.

Is a component of an electricity supply system that divides an electrical power feed into subsidiary circuits.

While providing a protective fuse or circuit breaker for each circuit in a common enclosure.

Panel Feed Wire: Purpose

A subpanel is a smaller service panel that distributes power to a specific area of the home or other building on the property.

It is essentially a satellite circuit breaker panel that has its own breakers and is usually install in an area that is convenient to the area it serves.

The subpanel is fed by a double-pole 240-volt breaker at the main service panel. 

This single-feed circuit is divide into additional branch circuits at the subpanel.

Advantages

Subpanels are add to a system for three common reasons: space, convenience, or efficiency.

Subpanels are usually use to extend the wiring for multiple branch circuits to a specific area of a home or to a building at some distance away from the main panel.

A garage, outbuilding, or a room addition might be a place to put a subpanel.

The idea is to run a single set of feeder wires from the main panel to a subpanel.

Where the power will then be divided into multiple branch circuits serving that building or area of the house.

The circuits running from the subpanel may power light circuits, outlet circuits, or appliance circuits just like the main service panel.

The advantage here is that the circuits can be controlled from a more convenient location.

Than returning all the way to the main service panel, which might be at some distance.

In a garage with a workshop, for example, power tools might occasionally trip circuit breakers.

Resetting them is much easier if you can do it from the garage sub panel rather than returning to the main service panel. 

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