Schematic type refers to the wiring diagrams for electrical service Types A, C, D, or T from ED(6)

Service voltage is typically either 120/240V or 240/480V single phase

Disconnect rating is the amp rating of the main breaker. Type T services have no main breaker and are designated with 000.

SS is used if a safety switch ahead of the meter is required by the local electric provider. NS is used if a safety switch is not required.

The service enclosure may be made of galvanized steel (GS), stainless steel (SS), or aluminum (AL). GS enclosures are only allowed as called for in DMS-11082 through DMS-11084. GS is not allowed for Type A services or for custom-built C or D enclosures. All Type T services are galvanized steel (GS).

Enclosure mounted photocells (E) are mounted inside the service enclosure, positioned to receive light through a window. As an alternative, the photocell may be placed at the top of the service pole (T), or on each individual luminaire (L). Electrical services with no photocell are designated by (N).

The service support types GC, OC, TP, SP, and SF are specified by DMS-11080 and the ED standards. Types OT, EX, and TS are existing or are specified elsewhere in the plans. Pedestal services PS are specified by DMS-11080, DMS-11085, and ED(9).

Overhead services (OH) are fed from the electric utility to a weatherhead at the top of the pole. Underground services (UG) are fed from the electric utility through underground conduit into the bottom of the service equipment.