3Com SECPATH U200-CS Installation Manual page 45

Figure 4-6 Connect the PGND cable
(1) Grounding screw hole
(3) Grounding screw
(5) Grounding symbol
Follow these steps to connect the PGND cable, taking the U200-S for example:
Step1 Remove the grounding screw from the device chassis.
Step2 Put the supplied OT terminal of the PGND cable on the grounding screw.
Step3 Fasten the grounding screw, which is attached with the OT terminal of the PGND cable, into the
grounding screw hole with a screwdriver.
Step4 Connect the other end of the PGND cable to the ground. If no grounding bar is available, connect the
naked part of the PGND cable to the ground directly. If a grounding bar is available, connect the PGND
cable to the grounding bar as follows:
1) Use a cable stripper to strip off the insulation rubber about 15 mm (0.59 in.) from the PGND cable.
2) Wrap the naked part onto the grounding post of the grounding bar.
3) Fix the PGND cable onto the grounding post with a hex nut.
Figure 4-7 Connect the PGND cable to a grounding bar
(1) Hex nut
(3) Naked part of the PGND cable
(5) Grounding bar
The resistance between the device chassis and the ground must be less than 5 ohms.
Use the PGND cable provided with your U200 series device for effective chassis grounding.
Otherwise, the device may not be effectively grounded and thus be prone to damages.
(2) OT terminal
(4) PGND cable
(2) PGND cable
(4) Grounding post
4-5