Grounding Of System Input Power - GE Discovery NM/CT 670 Instructions Manual

Electrical Requirements

5.3.1 Grounding of System Input Power

Make sure to comply with both of the following grounding requirements:
Connecting to the Power Input Distribution Box (PIDB)

Connect the metal conduit, raceway, or the armor of the armored cable used to power the
system, to the PIDB.
Grounding wire

Run a dedicated 1/0 (50 mm

from the main distribution panel to the main facility ground.
Connect the ground wire to the MDP (A1) through which it passes, in accordance with

local codes.
Ensure that the resistance between the PIDB ground and the facility earth ground at the

MDP does not exceed 0.5 Ohm. Measure with an ohm meter and a piece of wire.
Ensure that the total resistance between the PIDB ground and earth does not exceed

2 Ohm. The system's ground conductor must be in the same conduit as the system phase
conductors. This ground conductor must be bonded to the main facility ground.
NOTE
The shield or armor of armored cable is not sufficient for this purpose.
Discovery NM/CT 670 – Standard Integration Instructions
5483063-1EN, Rev.2, ©2015 GE Healthcare
2
) or larger insulated copper ground wire with the phase wires
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5.3 Grounding
5.3.1 Grounding of System Input Power