Eaton 93PM 150 kW SIAC-B Three-Wire, Installation And Operation Manual, Page: 34 / 106

Installation Plan and Unpacking
3-14 Eaton 93PM Sidecar Integrated Accessory Cabinet-Bypass (150 kW and 200 kW SIAC-B) Installation and Operation Manual P-164000387—Rev 7 www.eaton.com/powerquality
3.2.3 SIAC-B Power Wiring Preparation
Read and understand the following notes while planning and performing the installation:
WARNING
As a result of the connected loads high leakage current is possible. Connection to earth ground is
required for safety and proper product operation. Do not check SIAC-B operation by any action that
includes removal of the earth (ground) connection with loads attached.
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Refer to national and local electrical codes for acceptable external wiring practices.
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For external wiring, use 75°C copper wire. Wire sizes listed in Table 3-2 and Table 3-3 are for copper wiring
only. If wire is run in an ambient temperature greater than 40°C, higher temperature wire and/or larger size
wire may be necessary. Wire sizes are based on using the specified breakers.
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Recommended wire sizes are based on NFPA National Electrical Code
®
(NEC
®
)70 Table 310.15(B)(16) 75°C
ampacity with 40°C ambient correction factors.
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Three-wire SIAC-B models do not use a neutral. Four-wire SIAC-B models use a neutral for bypass input and
load output, but not for rectifier input.
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The neutral conductor is sized the same as the phase conductor for balanced and resistive loads. Non-linear
loads, up to the maximum of 1.5x the load current, require a larger neutral conductor and should be sized in
accordance with NFPA NEC 70 Article 310.15(B)(5).
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Refer to NEC Article 250 and local codes for proper grounding practices.
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Phase rotation must be clockwise starting with phase A (rotation A,B,C).
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Per NEC Article 300-20(a), all three-phase conductors must be run in the same conduit. A ground wire must
be run in the same conduit as the phase conductors.
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Conduit is to be sized to accommodate three phase conductors, one neutral conductor (four-wire models
only), and one ground conductor. If an oversized neutral conductor (four-wire models only) is to be installed,
a larger conduit size is needed to accommodate the oversized neutral.
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Refer to the appropriate Eaton 93PM UPS Installation and Operation manual, listed in paragraph 1.7, for UPS
cabinet conduit and terminal specifications and locations.
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Material and labor for external wiring requirements are to be provided by the customer.
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If installing an external maintenance bypass, all feeds to the UPS including the Rectifier Input Breaker (RIB)
(if installed) must have a service disconnect independent of the maintenance bypass power path. Most
maintenance bypass solutions provide UPS input feeds derived from but isolated from the maintenance
bypass power path. If the maintenance bypass solution being installed does not provide such functionality,
DO NOT use a single feeder breaker to supply both the UPS and the maintenance bypass.
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The term line-up-and-match refers to accessory cabinets that are physically located adjacent to the UPS. The
term standalone refers to accessory cabinets that are located separate from the UPS.