Electrical Requirements
5.1 Power Feed
Discovery NM/CT 670 – Standard Integration Instructions
5483063-1EN, Rev.2, ©2015 GE Healthcare
5-2
The following tables (
Table 5-2, D670 Nominal Line Voltage Ranges, p.5-3
Minimum Feeder Wire Size, p.5-4
Table 5-4, Power Supply Requirements, p.5-5
) are based on
the use of copper wire, rated 75 C and run in steel conduit. The current rating (ampacity) is
determined in accordance with the National Electrical Code (NFPA 70), Table 310-16 (2002).
Table 5-1: D670 System Power Characteristics
Selected Technique
Values
Maximum power demand
140 KV, 380 mA
90 kVA @ 0.85 PF
Continuous (average) power demand at maximum duty cycle
20 kVA
Maximum allowable total source regulation
6%
Minimum recommended transformer size
*
*
With 2.4% rated regulation at unity power factor. Resultant maximum allowable feeder regulation is 3.4%
112 kVA
NOTE
If local regulations require feeding electronic equipment in either the scan room or the operator room via a separate
isolation transformer, you can order the Isolation Transformer (P/N E4500BC).
NOTE
Ampacity, or Current Rating, is the RMS current which a device can carry within specified temperature limitations in a
specified environment, depending upon: a) temperature rating, b) power loss, c) heat dissipation.
The ampacity for a power cable depends on properties of the conductor and the insulation and on environmental
conditions adjacent to the cable.
