EXFO FTB-2 - Manual (Page 26)

Safety Information
16 FTB-2 and FTB-2 Pro
Electrical Safety Information
Electrical Safety Information
If you need to ensure that the unit is completely turned off, disconnect the
power cable and remove the batteries.
W
ARNING

Insert the power cable plug into a power outlet with a
protective ground contact. Do not use an extension cord
without a protective conductor.

Before turning on the unit, connect all grounding terminals and
extension cords to a protective ground via a ground socket. Any
interruption of the protective grounding is a potential shock
hazard and may cause personal injury. Whenever the ground
protection is impaired, do not use the unit and secure it against
any accidental operation.

Do not tamper with the protective ground terminal.