Emerson 10-30kVA Manuel D’Utilisation

The safety ground busbar is located below the neutral input and output busbars as shown in 

Figure 5 below. The safety ground cable must be connected to the ground busbar and bonded to each 

cabinet in the system.
All cabinets and cable conduit should be grounded in accordance with local regulations.

For safety, it is necessary to install circuit breakers in the input AC supply and external battery bat-

tery cabinets, external to the UPS system. Given that every installation has its own characteristics, 

this section provides guidelines for qualified installation engineers with knowledge of operating prac-

tices, regulatory standards and the equipment to be installed.

• Protection from excessive overcurrents and short circuits in power supply input

External overcurrent protection for the AC output circuit is to be provided. See 6.4 - UPS Elec-

trical Characteristics and Table 12 for overload capacity.
High-speed fuses and SCRs are used for internal battery circuit overcurrent protection. When an 

external battery supply is used, overcurrent protection for the battery circuit is to be provided by 

the customer.

When wiring the UPS with dual inputs, the Rectifier input and the Bypass input must be pro-

tected separately. Size the breakers according to the input currents shown in Table 10.

When using an external distribution panel for load distribution, the output neutral and input neutral 

must be separated at the input to the UPS.

Failure to follow proper grounding procedures can result in electric shock hazard to personnel 

or the risk of fire, should a ground fault occur.

NOTE
Proper grounding significantly reduces problems in systems caused by electromagnetic 

NOTE
The ground and neutral busbars are easily accessible when the left protective cover plate is 

OUTPUT

NEUTRAL

INPUT

NEUTRAL