APC Symmetra MW Installation Guide download pdf (Page 44)

Appendix: TT Systems

38 Symmetra MW 800 kW 3 × 400/230 V Installation Guide - 990-1510B

When the protective device is an overcurrent protective device, it must be either:

• a device with inverse time characteristics and

must be the current causing automatic

operation within 5 seconds, or

• a device with an instantaneous tripping characteristic and

must be the minimum current

causing instantaneous tripping

The following diagram shows a Symmetra

MW installed in a TT system:

• Earthing arrangements and protective conductors - Symmetra

MW in “TT installation”

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APC Symmetra MW Installation Guide Page 44