1113.6 Fire Escapes, Exit Ladder Devices
Fire escapes may be used as one means of egress if the pitch does not exceed 60 degrees, the width is not less than 18 inches (457 mm), the treads are not less than 4 inches (102 mm) wide, and they extend to the ground or are provided with counterbalanced stairs reaching to the ground. Access shall be by an opening having a minimum dimension of 29 inches (737 mm) when open. The sill shall not be more than 30 inches (762 mm) above the floor and landing.
A ladder device, when used in lieu of a fire escape, shall conform to Section 1113.6.1 and the following:
The building does not exceed three stories in height.
The access is adjacent to an opening as specified for emergency egress or rescue or from a balcony.
The device does not pass in front of any building opening below the unit being served.
The availability of activating the ladder device is accessible only to the opening or balcony served.
The device as installed will not cause a person using it to be within 12 feet (3658 mm) of exposed energized high-voltage conductors.