Installation Depending On The System Earthing Arrangement; Ups With Common Normal And Bypass Ac Inputs; Ups With Separate Normal And Bypass Ac Inputs - Eaton EX RT 7 Manual De Instalación Y Usuario

2. Installation
2.5 Installation depending on the system earthing arrangement (SEA)
EX UPS can only be connected to single phase and neutral distributed systems.

UPS with common Normal and Bypass AC inputs

Main
lowvoltage
switchboard
(MLVS)
Change in SEA between upstream and downstream or galvanic isolation required
Main
lowvoltage
switchboard
(MLVS)
Main
lowvoltage
switchboard
(MLVS)

UPS with separate Normal and Bypass AC inputs

Main
lowvoltage
switchboard
(MLVS)
Change in SEA between upstream and downstream or galvanic isolation required
Main
lowvoltage
switchboard
(MLVS)
(*): The transformer is not necessary if:
z Normal and Bypass AC inputs are connected to the same source,
and wires cross sections and wires lengths on Normal and Bypass inputs are identical,
z
and upstream protection is provided by only one switch with RCD (residual current device)
z
for Normal and Bypass inputs.
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11
Bypass AC
Normal AC
10
Bypass AC
11
Isolation
transformer
part number 68003
10
Normal AC
Bypass AC
11
10
Normal AC
Bypass AC
11
(*)
10
Normal AC
Bypass AC
11
(*)
10
Normal AC
8
8
or
8
8
8
Load
Load
Load
Load
Load