GE XLG3 - Manual (Page 33)

24 Chapter 2 Safe Powering and Grounding GE Inspection Technologies XLG3 VideoProbe System
Verifying AC Earth Ground Path
In most cases when using an AC power source, safe use of the XLG3 system requires
verifying a protective earth ground path.
To Verify AC Earth Ground Path
1. Verify that the plugs on the AC cable, and any extension cord, have a ground prong.
2. Use an ohm meter to measure the resistance from the ground prong to the base unit’s
ground lug to be sure that the AC cable is in good condition.
3. Verify that the AC outlet has a hole for the ground prong.
4. If a good earth ground is not available through the AC outlet,
connect an external ground wire to the base unit’s ground lug,
then connect the wire to earth ground or to the equipment
being inspected.
A ground wire (part number XLG3AGROUND) is available
from GE Inspection Technologies.
WARNING Do not use a three-prong grounded plug adapter in a two-prong
wall outlet. Doing so could result in a shock.
WARNING CONNECTING TO A VEHICLE INVERTER. If you connect the
XLG3 system to a vehicle inverter, which converts a vehicle's 12-volt DC
power to 110-volt AC, even if the inverter's power outlet has a ground plug,
the XLG3 system is not necessarily earth grounded, since vehicles usually
have rubber tires. You must still connect the base unit’s ground lug to a proper
earth ground and vehicle chassis. Failure to properly ground the base unit can
result in a shock.