APC MW II manual Earthing arrangements and protective conductors

32

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

Service Entrance

Residual current protective device can not be used at this point.

Owing to parallel return path for the fault current

Residual Current Sense

N

With reference to IEC 60364-4-41 § 413.1.4.1

Earthing arrangements and protective conductors

-

Symmetra MWTTininstallation

See:

IEC 60364-4-41

§ 413.1.4

Switchgear

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

EarthingProtectiveCondu ctor

L3

u

L3

Common-mode filter

u

u

M

Main

inverter

N

N

E

PE

Main Protective Earthing Terminal

PE

PE

+

-

+

-

Battery 1

Battery 2

Battery

Suitable earth electrode: RA x

Ia

< 50V

breaker

With reference to IEC 60364-4-41

§ 413.1.4.2

box Q7

Q8

PE

Battery

rack

Battery 1

Battery 2

PE