3. Ground the DGA monitor:
a. Run the cable from the ground terminal to the grounding point, and secure it so it
does not hang loose.
b. Connect the cable to the grounding point on the DGA monitor.
If necessary for good connection, you can replace the grounding
connector with your own cable terminal. The bolt is M8 size.
c. Connect the other end of the cable to the grounding point.
d. Measure the resistance from the ground terminal to the grounding point to verify the
grounding.
4. Repeat step 3 to ground the power supply unit as well.
More information
‣
OPT100 cable glands and connectors (page 39)
‣
OPTPSU cable glands and connectors (page 40)
4.5
Connecting OPTPSU power to DGA monitor
• Instrument power cable (Vaisala cable CBL210544)
• Screwdriver with 3-mm-wide (0.12‑in) slotted head
• Adjustable wrench
If the Vaisala-supplied instrument power cable is not available, use
a shielded cable with 6 mm
2
(10 AWG) wires. Maximum length of the cable is
1.2 m (3 ft 11 in).
CAUTION!
1. Open the cable gland marked DC in on the DGA monitor. Remove the plug and store it for
later use.
2. Insert the instrument power cable through the outer nut and the seal insert, and start
inserting the cable through the cable gland. Stop when you reach the section of the cable
where the metal braid is exposed.
3. Bend the cable braid over the seal insert so that it will make contact with metal when the
cable gland is tightened.
4. Push the outer nut and the seal insert against the contact socket of the gland and tighten
the outer nut.
Chapter 4 – Electrical installation
43
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