Specifications include, but are not limited to: The traffic signal cabinet shall be equipped with a transfer switch on the outside of the cabinet, no less than 24” above ground level, for the use of an emergency generator to power the signals in case of a signal blackout. The transfer switch shall be in accordance with the 2002 National Electric Code Article 702.6 to prevent feeding back to the utility source. The transfer switch shall be rated for 20 amps at 125 volt with a jumper cord for transitioned from the twist-lok plug in the transfer switch to the standard 120 volt plug for the generator. A circuit breaker-based switch shall be required to have overload protection in accordance with the National Electric Code/NFPA70