ADTRAN ESU LT User Manual page 23

Chapter 2. Installation
equipment grounding conductor is permitted to be made to building
steel, to a metal electrical raceway system, or to any grounded item
that is permanently and reliably connected to the electrical service
equipment ground.
Bare, covered, or insulated grounding conductors are acceptable. A
covered or insulated grounding conductor shall have a continuous
outer finish that is either green, or green with one or more yellow
stripes.
The supplemental grounding conductor shall be connected to the
equipment using a number 8 ring terminal. The terminal should be
fastened to the grounding lug provided on the rear panel of the
equipment. The ring terminal should be installed using the
appropriate crimping tool (AMP P/N 59250 T-EAD Crimping Tool
or equivalent).
61200410L2-1A ESU LT User Manual 23