Equipment To Be Installed Above Finish Floor Elevation

In an elevation view all vertical dimensions within a finished interior space would reference a f f.

Equipment to be installed above finish floor elevation.

Reference plane as it s name implies is the top surface of the finished flooring material. Typical usage is no component of a hanging light fixture to extend below 7 0 a f f above finished floor. The work space shall be clear and extend from the grade floor or platform to a height of 6 1 2 feet or the height of the equipment whichever is greater. With the letter a has an attached garage floor elevation at or above the base flood elevation bfe the garage floor may be excluded for rating.

The electrical equipment itself may have a height that is less than 6 1 2 feet but if it is mounted so the top of the equipment is higher than 6 1 2 feet the minimum working space height shall be the equipment height. An attached garage floor elevation below the bfe can be excluded as the lowest floor for rating if the garage has no machinery or equipment below the bfe. Equipment mounted on an exte rior wall e g an electric meter incoming electric telephone and cable television lines usually can be mounted higher up on the same wall. Once the finish floor elevation is established the other project elevations are based off the finish floor.

For example you may have masonry walls on the sides of the building showing top of wall at 16 feet 6 inches on the drawings. The finish floor is then considered ff 0 0. 9 1 elevation service equipment installed outside your home can usually be elevated above the flood level. In many cases the elevation of the finish floor is a benchmark elevation with other dimensions noted as aff or above this finish floor height.