Apc GALAXY 7000 User Manual download pdf (Page 24)

System earthing arrangements >

34020846EN/AD - Page 24

1. Installation

1.4 System earthing arrangements

This section lists the main SEAs (system earthing arrangements) and their wiring requirements. For SEAs not listed here,

please contact the technical-support department.

Single UPS system

TNS upstream, TNS downstream

For separate normal and bypass AC lines from a single source.

Without residual-current protection

With residual-current protection

UPS units used as frequency converters: please contact your technical assistance

Galvanic isolation between the normal and bypass AC lines is mandatory.

The recommended minimum residual current protection is 3A, provided the conditions defined in IEC364.4-41 are

respected.

For a transformer on a Bypass AC network

For a transformer on a Normal AC network

Adding a transformer into the Normal AC network reduces the installation’s overall yield.

Bypass AC

Normal AC

Load

UPS

PFC

INV

MLVS

Bypass AC

Normal AC

(4p)

Load

UPS

PFC

INV

MLVS

Bypass AC

Normal AC

Load

PFC

INV

MLVS

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Apc GALAXY 7000 User Manual Page 24