A. Provide interlocks so that, if primary power is lost or shut down to the take-away section, the feedconveyor will automatically shut down and cannot be started until the take-away section is operating.Provide photo-eyes at the take-away side of the wall opening so that if a back-up of goods is sensed they will shut down the feed conveyor. Provide a time-delay switch so that, during normal shutdown take-away section will continue to operate briefly after the feed section has been shut down so the opening is clear.B. Ensure the distance between the upper end of an inclined gravity section and the face of the fire door on its respective side (Y) of the fire wall is at least equal to the maximum dimension of the opening (Figs.75 and 76). When this is not practical, provide fire doors with a 30-minute temperature rise rating of 250°F (121°C) on the opening.
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