Reqired Numbersof Elevator Per Floor Per Occupant
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The requirements of 407 apply to destination oriented elevators but some provisions or exceptions which are summarized here are unique to this type of elevator.
Reqired numbersof elevator per floor per occupant. Destination oriented elevators group passengers for the same destination to reduce wait and travel times. This type of elevator reduces the number of stops per trip. When using a destination oriented elevator an occupant calls an elevator car by first indicating which floor they need usually on a keypad. An elevator is not required because each floor has less than 3000 square feet.
Each occupant evacuation elevator lobby shall have minimum floor area as follows. A four story office building has 3500 square feet on the first floor and 2500 square feet on each of the other floors. An elevator is required. Lobby indicators designate which car to use which is programmed by the time of arrival.
Figuring the number of people can be a tricky business firstly one has to calculate the total population in a building which could be unknown if it s a speculative project secondly not all the people would want to go to the same floors at the same time. Occupant evacuation elevator lobbies shall be able to house one wheelchair with a space of 30 inches by 48 inches for every 50 persons within the area the lobby serves. Population to be served. The occupant evacuation elevator lobby shall accommodate 3 square feet per person not less than 25 percent of the occupant load of the floor area served by the lobby.
One needs to know the number of people the elevators are to be planned for. The occupant evacuation elevator lobby floor area also shall accommodate one wheelchair space of 30 inches by 48 inches. If you are designing such a building i would call the building official to confirm this is the jurisdictions interpretation before you apply for a permit.
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