Eaton 93PR 500 kW UPS
User's and Installation Guide
25
3.2.2. UPS System Power Wiring Preparation
NOTE
If installing a maintenance bypass, a minimum of two separate feeds with upstream feeder breakers, or a
single feed with two upstream feeder breakers, must be provided: one for the UPS or rectifier input breaker (if
installed) and one for the maintenance bypass input. DO NOT use a single feed or a single feeder breaker to
supply both the UPS or rectifier input breaker and the maintenance bypass. If a bypass input breaker is installed
in the maintenance bypass and a single-feed UPS is being installed, a single feed to the maintenance bypass is
acceptable for supplying both the UPS and the bypass.
Read and understand the following notes while planning and performing the installation:
• Refer to national and local electrical codes for acceptable external wiring practices.
• To allow for future kVA upgrades (software and/or hardware), consider using conductors sized for full
bypass rating of the UPS.
• Material and labor for external wiring requirements are to be provided by designated personnel.
• For external wiring, use 90 °C copper wire. See the appropriate information in Table
3-6
: Maximum Sup-
port Multi-core Cable Sizes. Wire sizes are based on using the specified breakers.
• If wire is run in an ambient temperature greater than 30 °C, higher temperature wire and/or larger size
wire may be necessary.
• Specification is for copper wire with a 90 °C rating.
• The bypass feed into this equipment uses four wires. The rectifier feed into this equipment uses three
or four wires. The phases must be symmetrical about ground (from a Wye source) for proper equipment
operation.
• If the load requires a neutral, a bypass source neutral must be provided. If the load does not require a
neutral and there is no neutral conductor connected at the bypass input, a neutral must be installed to
source star point.
• A readily accessible disconnect device must be incorporated in all fixed input wiring.
To Next Page
Loading...
