What are the necessary steps for installing a 70 amp sub panel in a residential electrical system?

To install a 70 amp sub panel in a residential electrical system, follow these steps:

1. Turn off the main power supply to the house.
2. Determine the location for the sub panel and mount it securely.
3. Install a new circuit breaker in the main panel to connect to the sub panel.
4. Run appropriate gauge wires from the main panel to the sub panel.
5. Connect the wires to the circuit breaker in the main panel and the corresponding terminals in the sub panel.
6. Ground the sub panel according to local electrical codes.
7. Turn on the main power supply and test the sub panel to ensure it is functioning properly.