Connecting Cygnus Hpg; Earth Attachment: Installing An Earth Rod; Fig. 2 - Earth Point; Fig. 3 - Earth Rod - Firefly cygnus hpg User Manual

2.4 Connecting Cygnus HPG
When using as a standalone power source, a protective
earth must be connected to the unit in compliance with
applicable local standards and regulations.
This can be done either by connecting to a suitable existing
electrical earth, or by using an earth rod available from the
manufacturer as an accessory.

2.4.1 Earth attachment: Installing an Earth Rod

1. The Earth Point of Cygnus HPG is an M10 threaded stud with washers
and wing nut located on the skid to the right side of the unit.
2. Find a suitable place to drive the earth rod into the ground. The earth
rod should be driven down at least half way into the ground using a
mallet and placed as near to the unit as possible.
3. Check the earth cable is securely clamped to the rod. The clamp may
need re-tightening after driving the earth rod down.
4. Undo the wing nut from the unit's earth bolt and remove one of the
washers. Then slide the ring terminal at the end of the earth cable onto
the earth bolt. Replace the washer and securely tighten the nut. Refer
to

"Fig. 2 - Earth Point"

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Fig. 2 - Earth Point

Fig. 3 - Earth Rod