Specifications

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or other means of dissemination may be made without written permission.
3BUS 208 000 R1301 31Hardware Installation
Scanning Platform Power Distribution Center (SPDC)
The main power supply to the Scanning Platform must be from the same power
supply as the host system. If there must be a deviation, then the two supplies must
be bonded to the same ground (single point earth reference).
A neutral to ground bond must exist on the secondary side of the Scanning Platform
Distribution Center (SPDC). This bond must be only in the SPDC.
The SPDC is 10KVA and can handle the largest Scanning Platform system including
the purge blower and Liquid Cooling Unit. Even if your installation does not
consume that much power, the input wiring, fusing, and disconnect should still be
sized for the full 10 KVA.
Allowable input voltages to the transformer are:
• Rated Input Voltage: 240, 230, 220, 208, or 200 volts ± 10%
• Rated Frequency: 50 or 60 Hertz (Hz) ± 1%
• Rated Current: 41.7 amps @ 240 VAC
The secondary is always wired as 120/240 volts alternating current (VAC).
Cabling
The National Fire Protection Association (NFPA), Publication No. 70 “The
National Electric Code (NEC)”, Article 725 states that Class 1, Class 2, and Class
3 Remote-control, signaling, and power-limited circuits acknowledges alternative
requirements for circuits characterized by usage and electrical power limitation. It
specifies less stringent requirements than those for general wiring elsewhere in the
code.
The Scanning Platform utilizes ± 12 volts with adequate isolation to be safe without
further protective measures, even in wet environments. However, due to the
amperage available, it does not qualify as power-limited. Any of the circuits with
direct ties to the ± 12 volt power supplies qualify as “Class 1 Remote-Control and
Signaling Circuits” as defined by NEC Article 725-11b and as such, require
insulation suitable for 600 volts.
The serial communications circuits satisfy the “inherently limited” clause in Article
725-31 and may be wired using the Class 2 (or Class 3) rules. The cables provided
by ABB for these circuits are dual rated CL3/PLTC with 300 volt insulation.
NEC Article 725-52a(2) prohibits conductors of Class 2 or Class 3 circuits from
being “placed in any cable, cable tray, compartment, enclosure, outlet box, raceway,
or similar fitting with conductors of electric light, power, Class 1, and non power-
limited fire protective signaling circuits”, except where conductors of the different
circuits are separated by a barrier.