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GE M
S
EDICAL
YSTEMS
D
5123449-100, R
IRECTION
_____________________________________________________________________________________________
8. System Facility Power and Grounds
8.1.
Introduction
The purpose of this section is to ensure that the product is properly powered and grounded thus ensuring the proper
operation of the product installed. The information in this chapter should be adhered to, unless there are written
deviations approved by GE Medical Systems.
This section gives the sizes and procedures, on how to power and ground your system. If these power and
grounding instructions are not adhered to, proper operation cannot be guaranteed. Any cost associated and found to
be result of non-conformity, as stated in this section may result in additional cost charged back to the institution
and/or their contractor.
8.2.
Electrical Power and Disconnects
Note: in P.R.C. China, all power and ground cables attached to the primary supply source
must be CCC certified.
8.3.
Power Quality
The electrical power from its origination to the system must adhere to the wire size and transformer sizes, as
prescribed in the installation drawings. The feeder voltage-drops as well as the supplying power must be given
within the parameters. Sizing for feeder is usually calculated for a maximum of 2% voltage drop at the minimum
voltage range. The actual feeder size may vary from the installation drawing for a facilities voltage.
Calculate feeder losses before you begin. Total feeder losses must be calculated to ensure that the losses are less
than those specified in the installation drawings. Calculating the recommended minimum transformer sizing feeding
a system, ensure the transformer losses are less than half of the maximum regulation for the system.
Regulation is the calculated voltage losses for the entire power distribution system (No-Load Voltage minus Full-
Load Voltage) divided by the no-load voltage minus the system losses (Full-Load Voltage)
NoLoadVolt
=
Re
gulation
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 is
performed.
8.3.1. Optional System Main Disconnect
An optional system main disconnect has been designed specifically for the Precision RXi system and may be
purchased by the customer. E4502KP is available for 480V input and E4502KR is available for 400V input.
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EVISION
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age
FullLoadVo
FullLoadVo
ltage
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RECISION
ltage
×
100
June 2009
RX
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P
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YSTEM
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NSTALLATION
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