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Illustrated Changes to the NEC, 2005 Edition - Part 2

Article 702

Optional Standby Systems

702.6 Transfer Equipment

Part I. General

A new exception exempts transfer equipment for the temporary connection of a portable generator, but only under restricted conditions.

A transfer switch is required for all fixed or portable optional standby power systems to prevent the interconnection of normal and alternate sources of supply.

Ex: Temporary connection of a portable generator without transfer equipment is permitted, where written safety procedures are in place and conditions of maintenance and supervision ensure that only qualified persons will service the installation, and where the normal supply is physically isolated by a lockable disconnecting means or by the disconnection of the normal supply conductors.

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