Electrical Sub Panel Sizes

The heart of a home s electrical system is the main circuit breaker box also known as the main service panel.

Electrical sub panel sizes.

Sub panels are best when multiple circuits are needed in a single area separate from your main house such as a workshop or greenhouse. Main panels come in scores of sizes and configurations. A panel might be mounted on the outside of the house either separate from or combined with the electric meter or on an inside wall behind the meter. A sub panel is a smaller electrical panel that services a specific area of the home.

Use 1 1 4 inch pvc conduit for a 100 amp sub panel or 1 inch pvc conduit if the sub panel is 50 amps or less. I would like to upgrade and put a breaker box in the garage so i can put in more lights outlets and run a pool pump etc. I currently have power ran out to my garage however it only runs 2 lights and the wiring is old. Calculating subpanel wattage.

A subpanel is often installed in a barn workshop garage or other addition to a home. This is where the power feed from the utility company first enters the home from the meter and the point at which all the power is distributed to the various branch circuits of the house. Dig an 18 inch deep trench for the outdoor electrical wire which you will run from the main panel box to the garage sub panel. An electrical subpanel installs downstream from a home s main breaker panel.

Voltage drop is a loss of voltage that occurs. When planning the wire size for a sub panel or any panel for that matter it is important to factor in the length of the distance to the panel from the source and the amperage of the sub panel. Subpanels are rated in terms of how much power they can safely monitor. It s usually located near the area it powers.

To calculate the required wattage rating needed to supply the subpanel multiply the total wattage from the square footage and appliance calculations times 1 25 to get the adjusted load this safety adjustment is required by the national electrical code and provides a buffer for voltage drop on the feeder circuit. It holds separate circuit breakers from the main breaker panel. The circuit loads placed upon the sub panel will determine the size of the sub panel as well. Run the conduit from the garage to the main panel box.