APC MW II manual Grounding

Symmetra MW II 1200 kW 3 × 400/230 V Installation - 990-1979E-001

Earthing arrangements and protective conductors - Symmetra MW in -"ITinstallation"

See:

IEC 60364-4-41

§ 413.1.5

Switchgear

Service Entrance

Q3

( PDU )

Residual Current Sense

Residual current protective device

can be used.

Q5

External SSW-Bypass

Q6

Bypass - input

Bypass - output

L1

L1

L2

L2

L3

L3

Main Protective Earthing Terminal

PE

PE

Q4

PE

SymmetraMW

Q1

Mains - input

i

Delta

UPS - output

Inverter

L1

i

L1

L2

i

L2

L3

L3

filter

u

u

M

Common-mode

u

Main

Grounding

inverter

Z

impedance

Insulation

Monitoring

Device

N

N

N

E

Main Protective Earthing Terminal

Protective Earthing Conductor

ConductorEarthing

PE

2Battery

PE

Z

Grounding

1Battery

impedance

+

-

+

-

( Alternative to earth electrode )

Requirement !!

IEC 60664-4-41

§ 413.1.5.4

Battery

breaker

box Q7

Q8

Suitable earth electrode: RA x Id

< 50V

PE

With reference to IEC 60364-4-41

§ 413.1.5.3

Alternative:

The exposed-conductive-parts can be earthed individually or in groups.

But special demands are required. See IEC 60364-4-41 § 413.1.5.5 a)

Battery

rack

Battery 1

Battery 2

PE

33