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NEC Article 700
Article 700 covers the requirements for Emergency Systems. Emergency Systems are those systems legally required and classed as emergency by municipal, state, federal, or other codes, or by any governmental agency having jurisdiction. These systems are intended to automatically supply illumination, power, or both, to designated areas and equipment in the event of failure of the normal supply or in the event of accident to elements of a system intended to supply, distribute, and control power and illumination essential for safety to human life.
NEC Article 701
Article 701 covers the requirements for Legally Required Standby Systems. Legally Required Standby Systems consist only of those that are permanently installed in their entirety, including the power source.
NEC Article 702
Article 702 covers the requirements for Optional Standby Systems. Optional Standby Systems consist of those that are permanently installed in their entirety, including prime movers, and those that are arranged for a connection to a premises wiring system from a portable alternate power supply. For fire alarm system power supply purposes, a system complying with the requirements of Article 702 must also comply with the requirements of Article 700 or Article 701.
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