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7 – Wiring
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DANGER! LETHAL HIGH VOLTAGE HAZARD!
All wiring should be performed by a qualifi ed electrician, in accordance with the warnings in this manual and all applicable
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electrical and safety codes. Incorrect wiring may damage the UPS system severely and cause serious personal injury and
property damage. Read
7-1 Wiring Warnings
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De-energize all input and output power sources of the UPS system before installing cables or making electrical connections.
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Use flexible cable of sufficient length to permit UPS system servicing. The maximum cable length is 10 m (32.8 ft).
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Use ferrule caps to cover termination cables and prevent frayed ends from shorting on the UPS system terminal block.
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Use cabling rated VW-1, FT-1 or better.
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Use cable sleeves and connector clamps.
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The neutral conductor must be the same size as the current conductors.
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Tighten all connections with a torque of at least 3.95 N·m (35 in·lb)
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Confirm that all cables are marked correctly according to their purpose, polarity, phase and diameter.
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If the UPS system's input/output power source is wye-wye, then "Neutral" and "Ground" must not be connected.
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If the input power source has VNG>0, install an isolation transformer before the UPS system and input power source, then connect the UPS
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system's "Neutral" and "Ground" together.
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For equipment requiring a neutral connection to an IT power distribution system, the disconnect device must be a four-pole device and must
disconnect all line conductors and the neutral conductor. If a disconnect device interrupts the neutral conductor, it must simultaneously interrupt
all line conductors.
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Allow the batteries to charge uninterrupted for 24 hours after the initial wiring connection.
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Observe proper polarity by connecting negative to negative and positive to positive. Failure to observe proper polarity will damage the UPS
system and create a serious risk of personal injury and property damage.
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Observe proper phase by connecting R to R, S to S, T to T and N to N. Failure to observe proper phase will damage the UPS system and create a
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risk of personal injury and property damage.
7-2 Wiring Preparation
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De-energize all input and output (AC and DC) of the UPS system and external battery cabinet (if present).
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Mark all cables according to their correct purpose, polarity, phase and diameter.
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Review the diagrams in
Section 7-3
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Consult the table in
Section 7-5
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Note: If the UPS system's input/output power source is wye-wye, then "Neutral" and "Ground" must not be connected. If the input power source
has VNG>0, install an isolation transformer before the UPS system and input power source, then connect the UPS system's "Neutral" and
"Ground" together.
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200706017 93-2688 SU manual 4C.indd 16
200706017 93-2688 SU manual 4C.indd 16
Section 2 – Important Safety Instructions
and
Section 7-4
to familiarize yourself with the terminal blocks.
to find the correct electrical input/output characteristics for the UPS system.
before proceeding.
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11/29/2007 2:02:36 PM
11/29/2007 2:02:36 PM
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