Installation
2-8 Manual # 42-02-1P28 A3
General Wiring Guidelines
Basic wiring practices and grounding requirements are discussed in this section.
Proper Grounding Procedures
MCE cannot provide specific advice regarding equipment grounding (or bonding), as each
building is unique in its construction, and local codes may differ significantly from national
codes. For example, building steel is not always earth ground. In some cases, building beams
rest on concrete beam pockets, and the earth connection is inadequate. Paint and inadequate
metal material in any intermediary junction points can also cause poor ground connections.
Please consult with the building engineer or electrical contractor to determine the best source
for a low impedance connection to earth ground
Wiring Connections for Properly Grounded Systems
1. An uninterrupted ground wire of at least #8 AWG should be run from each car control-
ler cabinet chassis or back plate to earth ground. The connection at the car controller
must be free of paint so the ground connection is made to the bare metal of the enclo-
sure. The car controller should read less than 1-ohm to ground with the power off.
2. Ground straps, or short loops of ground wire, should be run from the controller ground
connection to the primary duct connections.
3. An uninterrupted #8 AWG ground wire should be run from the hoist motor frame to the
controller ground. The ground connection to the hoist motor must be free of paint.
4. An uninterrupted ground wire of minimum #14 AWG should be run from a termination
point on the cab to the controller ground.
5. An uninterrupted ground wire should be run from the cab enclosure to the ground ter-
minal on the cab to protect passengers and personnel from electrical shock.
6. An uninterrupted ground wire should be run from each car operating panel to the
ground terminal on the cab to protect passengers and personnel from electrical shock.
7. An uninterrupted ground wire should be run from the dispatch cabinet chassis or back
plate to earth ground. The connection at the dispatch cabinet must be free of paint so
the ground connection is made to the bare metal of the enclosure.
Ground Wiring
To obtain proper grounding, quality wiring materials and methods should be used. All ground-
ing in the elevator system must conform to all applicable codes. Proper grounding is essential
for system safety and helps to reduce noise-induced problems. The following are some ground-
ing guidelines:
• The grounding wire to the equipment cabinet should be as large as, or larger than, the pri-
mary AC power feeders for the controller and should be as short as possible.
• The grounding between equipment cabinets may be branching or a daisy chain, but the
wire must terminate at the last controller and NOT loop back.
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