RESIDENTIAL SERVICE-ENTRANCE AMPACITY WITH ELECTRIC SPACE HEATING

For a residential service installation with permanently installed electric space heating, the minimum ampacity of the service-entrance conductors shall be determined by the calculations outlined in Article 220 of the National Electrical Code but shall be not less than as follows:

RESIDENTIAL SERVICE EQUIPMENT

All service equipment, consisting of circuit breakers or switches and fuses, shall be located at a readily accessible place near the point where the service-entrance conductors enter the building.

All service equipment must have a minimum interrupting capacity equal to the available fault current but in no case less than 10,000 amperes.

COMMERCIAL/INDUSTRIAL SERVICE REQUIREMENTS

Commercial and industrial service-entrance conductors and equipment shall have a minimum ampacity of 100 amperes and meet the available fault current interrupting requirements. The actual service ampacity shall be determined by the installed electrical loads and the requirements of the National Electrical Code. The Customer must provide the required service size when applying for service as specified in Section 4.

When service is supplied from Company secondary supply lines, the service requirements in Section 5 will apply in most cases. When the service requirements in Section 5 are no longer applicable for the installation, the service requirements in Section 6 shall be used.