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490.48 Substation Design, Documentation, and Required Diagram
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Substations shall be designed by a qualified licensed professional engineer. Where components or the entirety of the substation are listed by a qualified electrical testing laboratory, documentation of internal design features subject to the listing investigation shall not be required. The design shall address but not be limited to the following topics, and the documentation of this design shall be made available to the authority having jurisdiction:
- Clearances and exits
- Electrical enclosures
- Securing and support of electrical equipment
- Fire protection
- Safety ground connection provisions
- Guarding live parts
- Transformers and voltage regulation equipment
- Conductor insulation, electrical and mechanical protection, isolation, and terminations
- Application, arrangement, and disconnection of circuit breakers, switches, and fuses
- Provisions for oil filled equipment
- Surge arresters
A permanent, single-line diagram of the switch-gear shall be provided in a readily visible location within the same room or enclosed area with the switchgear, and this diagram shall clearly identify interlocks, isolation means, and all possible sources of voltage to the installation under normal or emergency conditions, and the marking on the switchgear shall cross-reference the diagram.
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