shall require only momentary pressure to operate. The "CLOSE" button shall
require constant pressure to maintain the closing motion of the door. If
the door is in motion and the "STOP" button is pressed or the "CLOSE"
button released, the door shall stop instantly and remain in the stop
position; from the stop position, the door may be operated in either
direction by the "OPEN" or "CLOSE" button. Pushbuttons shall be
full-guarded to prevent accidental operation. Provide limit switches to
automatically stop doors at the fully open and closed positions. Limit
switch positions shall be readily adjustable.
2.6.4
Safety Device
Provide a pneumatic or electric type safety device on the bottom edge of
electrically-operated doors. The device shall immediately stop and reverse
the door movement during the closing travel upon contact with an
obstruction in the door opening or upon failure of any component of the
control system. The door-closing circuit shall be automatically locked out
and the door shall be operable manually until the failure or damage has
been corrected. Do not use the safety device as a limit switch.
2.6.5
NEMA ST 20. Provide transformers in power circuits as necessary to reduce
the voltage on the control circuits to 120 volts or less.
2.6.6
Electrical Components
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NOTE: Ensure that labor and materials for
connecting motors and controls are specified in the
electrical section, e.g., "Sectional Overhead Doors:
Mount controls, including Type SO cable and takeup
reels furnished by the door manufacturer, and
provide necessary conduit, conductors, and devices
in accordance with the door manufacturer's wiring
diagrams."
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NFPA 70. Furnish manual or automatic control and safety devices, including
extra flexible Type SO cable and spring-loaded automatic takeup reel or
equivalent device, as required for operation of the doors. Conduit,
wiring, and mounting of controls are specified in Section 16402 INTERIOR
DISTRIBUTION SYSTEM.
[2.6.7
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NOTE: Delete this paragraph if not applicable. If
applicable, identify doors.
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In addition to meeting other requirements specified, electrical materials,
equipment, and devices for installation in hazardous locations, as defined
by NFPA 70, shall be specifically approved by Underwriters Laboratories or
by an independent testing agency using equivalent standards, for the
particular chemical group and the class and division of hazardous location
involved.
SECTION 08361
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