UPS INSTALLATION PLAN AND UNPACKINGEaton 9395 550/275 UPS (225–550 kVA) Installation and Operation Manual 164201716 Rev 2 www.eaton.com/powerquality 3-193.2.3 UPS System Interface Wiring PreparationControl wiring for features and options should be connected at the customer interfaceterminal blocks located inside the UPS.W A R N I N GDo not directly connect relay contacts to the mains related circuits. Reinforced insulation to the mains isrequired.Read and understand the following notes while planning and performing theinstallation: Use Class 1 wiring methods (as defined by the NEC) for interface wiring up to 30V.The wire should be rated at 24V, 1A minimum. Use Class 2 wiring methods (as defined by the NEC) for interface wiring from 30Vto 600V. The wire should be rated at 600V, 1A minimum and 12 AWG maximum. Use twisted‐pair wires for each input and return or common. All interface wiring and conduit is to be provided by the customer. When installing external interface wiring (for example, building alarm, relay output,battery breaker trip, and X-Slot) to the UPS interface terminals, conduit must beinstalled between each device and the UPS cabinet. Install the interface wiring in separate conduit from the power wiring. When installing internal interface wiring to X-Slot terminals, route the wiringthrough the internal opening in the X-Slot communication bay. All building alarm inputs or remote features require an isolated normally‐opencontact or switch (rated at 24 Vdc, 20 mA minimum) connected between the alarminput and common terminal. All control wiring and relay and switch contacts arecustomer‐supplied. The building alarms can be programmed to display the alarm functional name. LAN and telephone drops for use with X-Slot connectivity cards must be providedby the customer. The UPS battery aux and 48 Vdc shunt trip signal wiring from the UPS must beconnected to the DC source disconnect device. Battery aux and 48 Vdc shunt trip wiring should be a minimum of 18 AWG. The REPO feature opens all contactors in the UPS cabinet and isolates power fromyour critical load. Local electrical codes may also require tripping upstreamprotective devices to the UPS. The REPO switch must be a latching-type switch not tied to any other circuits. A jumper wire must be connected between pins 1 and 2 on TB1, if thenormally‐closed REPO contact is not used. REPO wiring should be a minimum of 22 AWG and a maximum of 14 AWG. The REPO switch wiring must be in accordance with NEC Article 725 Class 2requirements. The maximum distance between the REPO and the UPS cannot exceed150 meters (500 feet). Alarm relay contacts have a maximum current rating of 5A and a switched voltagerating of 30 Vac and 28 Vdc. Alarm relay wiring should be a minimum of 22 AWG.
