supply is either the normal or standby source.
Exception: Temporary connection of a portable generator without transfer equipment shall be permitted where conditions of maintenance and supervision ensure that only qualified persons service the installation and where the normal supply is physically isolated by a lockable disconnecting means or by disconnection of the normal supply conductors.
702.7 Signals. Audible and visual signal devices shall be provided, where practicable, for the following purposes.
(1) Derangement. To indicate derangement of the optional standby source.
(2) Carrying Load. To indicate that the optional standby source is carrying load.
Exception: Signals shall not be required for portable standby power sources.
702.8 Signs.
(A) Standby. A sign shall be placed at the service- entrance equipment that indicates the type and location of on-site optional standby power sources. A sign shall not be required for individual unit equipment for standby illumination.
(B) Grounding. Where the grounded circuit conductor connected to the optional standby power source is con- nected to a grounding electrode conductor at a location remote from the optional standby power source, there shall be a sign at the grounding location that identifies all optional standby power and normal sources connected at that location.
II. Circuit Wiring
702.9 Wiring Optional Standby Systems. The optional standby system wiring shall be permitted to occupy the same raceways, cables, boxes, and cabinets with other general wiring.
III. Grounding
702.10 Portable Generator Grounding.
(A) Separately Derived System. Where a portable op- tional standby source is used as a separately derived system, it shall be grounded to a grounding electrode in accordance with 250.30.
(B) Nonseparately Derived System. Where a portable optional standby source is used as a nonseparately derived system, the equipment grounding conductor shall be bonded to the system grounding electrode.