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Thread: Hotel load calculations

  1. #1
    Join Date
    Jun 2007
    Posts
    2

    Hotel load calculations

    Can anyone clarify how to calculate the load of a hotel properly. I have an 83 room, 3-story hotel, each room with a small 60A or 100A MLO panel. Each room has 2.6KW 240V cooktop and a 3.1KW PTAC. I assume I cannot lump the cooktop in with the overall room load calculation per NEC. 220.42. But I don't understand how to account for them. Can they be derated somehow using 220.55? And how about the PTACS. Is rthere anywhere where they can be derated? This is a 120/208V 3Ø4W main service.

  2. #2
    Join Date
    May 2003
    Posts
    318
    Quote Originally Posted by Hulick1
    Can anyone clarify how to calculate the load of a hotel properly. I have an 83 room, 3-story hotel, each room with a small 60A or 100A MLO panel. Each room has 2.6KW 240V cooktop and a 3.1KW PTAC. I assume I cannot lump the cooktop in with the overall room load calculation per NEC. 220.42. But I don't understand how to account for them. Can they be derated somehow using 220.55? And how about the PTACS. Is rthere anywhere where they can be derated? This is a 120/208V 3Ø4W main service.
    I would treat this part of the hotel as a multifamily dwelling per 220.84. Each unit would be calculated as an individual dwelling unit, then the factors of 220.84 applied to the feeders.

    Martin

  3. #3
    Join Date
    Jun 2007
    Posts
    2

    Smile Thanks Martin

    I am planning to treat the rooms as individual dwelling units as you suggest. Thanks for all your help.

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