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GE Healthcare
Direction 5743854-1EN, Revision 1
In the X-ray room, there must be a lockable facility power disconnect. It must be installed electrically
before the equipment, for the purpose of locking out the power. This must be done before service
to the high voltage system is performed.
1.3
Electrical Grounds
1.3.1
System and Facility Grounds
The ground for this system must originate at the system's power source and be continuous (i.e., transformer or first
access point of power into a facility, and be continuous to the system power disconnect in the room). Ground connection
at the power source must be at the grounding point of the "Neutral/Ground" if a "Wye" transformer is used, or typical
grounding points of a separately derived system. In the case of an external facility, it must be bonded to the facility
ground point at the electrical service entrance.
The "system" ground can be spliced using "High Compression Fittings" but must be properly terminated at each
distribution panel it passes through. When it is terminated, it must be connected
into an approved grounding block. Incoming and outgoing grounds must terminate at this same grounding block.
Grounds must only be terminated to approved grounding blocks. Grounds must never connect directly to the panels,
frames or other materials in a cabinet or distribution panel.
1.3.2
Recommended Ground Wire Sizes
The ground wire impedance from the system disconnect (including the ground rod) measured to earth, must not exceed
2 ohms (as measured by one of the applicable techniques described in Section 4 of ANSI/IEEE Standard 142 - 1982).
For general system grounding requirements and information on establishing an equipotential
grounding system, refer to:
• Direction 46-014505, Electrical Safety - Equipment Grounding
• Direction 46-014546, Electrical Safety - Leakage Currents
Page 96
Section 1.0 - System Facility Power and Grounds
Optima XR642/XR648 Pre-Installation
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