Chapter 5: Electrical Requirements; Power Feed - GE Discovery NM/CT 670 Instructions Manual

Chapter 5: Electrical Requirements

5.1 Power Feed

A dedicated feeder run from the facility main isolation transformer is recommended to power the
system. If the system must be powered from an existing distribution transformer and secondary
feeder, such as the equipment distribution panel of an x-ray department, installation with other
x-ray equipment that uses rapid film changers should be avoided. These changers use a large
number of high powered, closely spaced exposures, which may coincide with the CT scan and
produce image artifacts. If a dedicated distribution transformer is provided for the scanner, the
minimum recommended transformer size is 112.5 kVA, rated 2.4% regulation at unity power factor.
For this configuration, the minimum recommended feeder size and overcurrent protection device
based on line voltage is shown in
In all cases, qualified personnel must verify that the transformer and feeder, at point of take-off,
plus the run to the system meet all the requirements provided in this document.
Discovery NM/CT 670 – Standard Integration Instructions
5483063-1EN, Rev.2, ©2015 GE Healthcare
Table 5-3, D670 Minimum Feeder Wire Size,
5-1
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p.5-4.