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  1. britboy

    Design Letter A, B, D, D and E

    Thanks guys – I appreciate the assistance. I just reviewed NFPA 20, Article 6-4.1.2, that states “ ALL Fire Pump motors shall be of the Design Letter B type”. The type that you refer to as “the most commonly used motor”. As a side note, we do not use NEC 2002 nor 1999, but 1996, the Counties...
  2. britboy

    Design Letter A, B, D, D and E

    I'm sizing the cabling and overcurrent protection for a 480-volt 50HP Fire Pump, our pump supplier will not adequately explain the difference between the design letters, a,b,c,d and e. I need to know what size the OCP needs to be. NEC 1996 table 430-151B Locked Rotor amps, indicated that a...

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