Fire Pump Motor Nema Code

Branch circuit conductors to a single fire pump motor must have a rating of not less than 125 of the motor flc as listed in tables 430 248 or 430 250. The overload protection provided in the fire pump controller is the only overload protection permitted in the normal supply to the fire pump and is the only device permitted to open the motor circuit under locked rotor conditions 10 4 4 so the circuit s ocpd provides protection only for short circuit or ground faults. Three phase modifiable nema horizontal motors catalog pb202.

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In general it is accepted that small motors requires higher starting kva than larger motors.

Fire pump motor nema code. Designing electrical systems for fire pumps. Fire pump motors overview 512kb. Standard 3 phase motors often have these locked rotor codes. Three phase open dripproof odp energy efficient motors ul.

The starting kva required by a motor starting at full voltage is determined from the nameplate on the motor or from the manufacturer. The nameplates of alternating current ac motors built to national electrical manufacturers association nema standards reference a system of alphabetical letters that designate the principal characteristics of each motor code design and insulation class. Usage service guidelines. A a fire pump motor should be in accordance with nfpa 20 9 5 1 1 which states that it must comply with nema design b standards and be listed for fire pump service.

Nema close coupled pump motors are specifically designed for use on industrial and commercial pumping units. An odp enclosure can protect the motor s interior from water falling on top of the motor but not from water coming from the sides. Though critical to proper motor selection these designations are easy to misinterpret. Nema premium csa ce iso9001 certified.

Conductors supplying only a fire pump motor must have a minimum ampacity of at least 125 of the motor full load current rating as required by 430 22 695 6 b 2 as shown in fig. If the fire pump will be inside a room then a odp enclosure and nema 2 enclosure for the fire pump controller is sufficient even with sprinklers installed. Motor type code search. B fire pump applications are discussed in article 695 of nfpa 70.

Titan horizontal motors catalog pb210. When designing or installing electrical power supplies for fire pumps and their accessories you must apply special rules as listed in nfpa 70 the national electrical code nec and the standard for centrifugal fire pumps cfp nfpa 20. Since fire pumps are considered life safety equipment they must be reliable.