Grounding Wire - Toshiba G8000 Series Installation Manual

11.4 Grounding Wire

WARNING
A grounding bus is provided on the inside of the each unit. The bus is located on the front at the bottom of
the UPS units. For the 250/300kVA unit, it is located on the top left. See chapter 7 "Dimensions and
Weight" for bus location detailed.
It is recommended that 2 AWG (or 38mm
be fed through an opening at the bottom, or through a hole on a knockout plate (250/300kVA only). See
Figure 11.5 for knockout plate detail. Only one of 2 ground buses on top and at bottom shall be
connected to the ground for 250/300kVA.
The cable end must have Amp terminal of 1/2" (12mm) diameter hole to tighten with ground bus inside
the UPS, as the ground bus has 33/64" (13mm) screw hole.
The Amp terminal and ground bus shall be tightened with a 7/16" (10mm) diameter screw.
< 100~225kVA >
Ground bus
2
2AWG (38mm )
To the facility
Be sure to ground the UPS as specified.
Using the UPS without a proper ground will deteriorate the
insulation and may cause electric shock due to leakage currents.
The resistance to ground should be 10 or less.
2
) or larger cable be used for the grounding wire. The wire shall
10mm or 7/16"
Screw
12mm or 1/2"
Terminal
Feed
Through
Opening
Earth ground
Figure 11.6 - Earth Ground Wiring.
< 250/300kVA >
10mm
OR
7/16"
Screw
Another way
For grounding
Note:
Only one top or bottom should
be connected to ground.
35
Through knockout plate
On top (Recommended)