Chapter 4 Installation in a Hazardous Environment
Verifying Switch Operation
4-18
Catalyst 2955 Hardware Installation Guide
78-14944-03
• Four leads of 18-gauge copper wire, UL and CSA rated, style 1007 or 1569
twisted-pair copper appliance wiring material (AWM) wire (such as Belden
part number 9318)
• Wire-stripping tools for stripping 10-to-12- and 18-gauge wires
Grounding the Switch
Warning
This equipment is intended to be grounded to comply with emission and
immunity requirements. Ensure that the switch functional ground lug is
connected to earth ground during normal use.
Statement 1064
Warning
When installing the unit, always make the ground connection first and
disconnect it last.
Statement 42
Caution To make sure that the equipment is reliably connected to earth ground, follow the
grounding procedure instructions, and use a UL-listed ring terminal lug suitable
for number-10 to 12 AWG wire, such as Thomas & Bett part number RC10-14 or
equivalent.
To ground the switch to earth ground by using the functional ground screw, follow
these steps. Make sure to follow any grounding requirements at your site.
Step 1 Use a standard Phillips screwdriver or a ratcheting torque screwdriver with a
Phillips head to remove the ground screw from the front panel of the switch. Store
the ground screw for later use.
Step 2 If your ground wire is insulated, use a wire stripping tool to strip the 10- to
12-gauge ground wire to 0.5 inch (12.7 millimeter [mm]) ± 0.02 inch (0.5 mm) as
shown in Figure 4-2.
