APC VT ISX Specifications download pdf (Page 5)

Smart-UPS® VT ISX w/transformer, 20-30 kVA, 480 V, Installation

Minimum breaker settings

Note 1: the short-circuit level is indicated for the output value.

Recommended phase-conductor sizes [AWG] for

a 86°F (30°C) temperature environment

20kVA

Internal

fault

800%

overload

bypass

operation

150%

overload

normal/

battery

operation

125%

overload

normal/

battery

operation

Conti-

nuously

Mains input 4kA – – – 68A

Bypass input 2.3kA 444A – – 62A

Output 14kA 444A 84A 70A 62A

Duration <10ms 500ms 30 s 60 s

Notes 1

30kVA

Internal

fault

800%

overload

bypass

operation

150%

overload

normal/

battery

operation

125%

overload

normal/

battery

operation

Conti-

nuously

Mains input 5kA – – – 102 A

Bypass input 4.2k A 444 A – – 92 A

Output 14k A 444 A 125 A 105 A 92 A

Duration <10 ms 500 ms 30 s 60 s

Notes 1

UPS/AWG

sizes

Mains

input [AWG]

output [AWG]

DC input

[AWG], 75ºC Wire

20 kVA 6 4 4

30 kVA 4 1 1

Cable Size

[AWG]

Cable Lug

Type

Crimping

Tool

Die

Terminal

Bolt

Diameter

6 YA6CL2TC38 MD7-34R W5CVT 0.2 in/6 mm

4 YA4CL2TC38 MD7-34R W4CVT 0.2 in/6 mm

1 YA1CL2TC38 MD7-34R W1CVT 0.2 in/6 mm

∞

Wiring Verification

• Do not connect batteries in the UPS.

• If an XR Enclosure is installed make sure that the DC breaker is in the

OFF position and that both 125A fuses are removed from the XR

Enclosure.

• Check that the power wiring is torqued to 45 lbf

in/5 Nm.

• If your installation includes an XR Enclosure, remount the 125A

fuses in the XR Enclosure and check that the DC breaker on the XR

Battery Enclosure is in the ON position.

• Make sure the cable landing cover plates are installed.

• Leave a wiring diagram on site for service personnel.

• If a problem occurs, phone Customer Support at (1) (800) 800-4272

(US and Canada). Refer to Contact Information for contact numbers

in other countries.

• For any optional equipment, refer to product-specific manuals.

Load Connection

At the rear, the UPS contains at least one Distribution Units (PDU). As

standard, one PDU is installed on the left side seen from the rear. In

addition, a second PDU may be installed on the right side. The PDU has 6

breaker sets. The top breaker set operates as a unit and protects any 3-

phased equipment that may be connected to the PDU. This breaker unit

(must be toggled) will switch ON/OFF all 3 phases when operated (may

supply several loads). Each of the 5 other breaker sets protects the 5

single-phased outlets (L1, L2, L3) beneath the actual breaker set. The top

breaker in each of these 5 single-phased outlets protects L1, the middle

breaker protects L2, and the bottom breaker protects L3.

Connecting the load to the PDUs

Note

Use Molex lug type or equivalent, and crimp to

manufacturer’s specifications.

Warnin

At 100% non-linear load (EN50091-3 standard), the

neutral shall be rated for 200% phase current.

Smart-UPS® VT ISX w/transformer, 20-30 kVA, 480 V, Installation

Note

Connect the load equipment evenly between the 3 phases to

avoid overloading one particular single phase. The total

output capacity of the PDU is approximately twice the

output capability of the UPS. This means that UPS would be

over-loaded if all PDU outlets were loaded to their rating.

Load status on the individual phases can be found through

the UPS display or through the web interface.

Note

Equipment connected to the 3-phased output may require

overcurrent protection with a lower rating than the 3-phased

output.

Note

For 3-phased output, the highest current may be in the

Neutral conductor at non-linear loads (up to 173%) and may

trip the breaker.

Note

The UPS can support a 3-phase load if that load is connected

to the 3-phase terminal in order to ensure correct connection/

disconnection of the load across all 3 phases simultaneously

Note

ONLY single-phased Phase to Neutral loads may be

connected to the five L21-20 outlets as per NEC05. The

outlets have individual breakers for each phase for

maximum availability.

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APC VT ISX Specifications Page 5

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