Typical Sub Panel Feeder Options



Single-conductor SE cable (e.g., SER, USE): Commonly used for short distances, such as from a main panel to a nearby sub panel. Multi-conductor SE cable (e.g., MC cable): Less common for sub panel feeders due to increased cost and difficulty in terminating. Non-metallic sheathed cable (NM): Rarely used for sub panel feeders due to spacing and bending radius requirements.

Material



Copper (Cu): More expensive than aluminum, but offers better conductivity and corrosion resistance. Aluminum (Al): Less expensive than copper, but has higher resistance and is more prone to corrosion.

Conductor Size

The conductor size depends on the amperage rating of the sub panel:

100A sub panel

#2 AWG copper (Cu) 1/0 AWG aluminum (Al)

Other sub panel amperages

Refer to the National Electrical Code (NEC) for the appropriate conductor size.

Additional Considerations



Distance

SE cables are limited to certain maximum lengths based on conductor size and amperage.

Termination

Ensure proper termination at the main panel and sub panel using approved connectors.

Conduit

If the sub panel is located a significant distance from the main panel, it may be necessary to run the SE cable inside a conduit for protection.

Local codes: Always check with local building codes for any specific requirements regarding sub panel feeders.In general, #2 AWG copper SE cable is the most common option for 100A sub panel feeders due to its availability, ease of installation, and reliability. Flag for review