The UPS is not equipped with isolation circuit breakers. Qualified personnel should provide the external breakers for the AC
input/output, bypass input and DC input.
Table 9.4 shows the minimum external breaker rating for each UPS. The bypass, input and output require 3-pole breakers.
Note: Above Amp trip ratings are sized for the worst case in the UPS System (Primpary Input Breaker) according to NEC
215.3 guidlines. For more exact recommendations, please refer to "Appendix C – Installation Planning Guide".
* For Battery Cabinet Systems not equipped with built-in over-current protection devices.
The earth grounding bus is located behind the dead front, close to the power lugs. See Section 8.5-8.7. Connect the
grounding wire to the earth ground bus.
The 15-50kVA UPS have a bus strip with 7 (seven) threaded holes for M4 bolts. Use a AWG 2 (or 38 mm
for the grounding wire. Connect the crimp terminal and ground bus together using a M4 bolt.
The 80-100kVA UPS has a ground bus with 10 (ten) M5x0.8 threaded holes, and 6 (six) 0.5118 in (13 mm) unthreaded
holes for 1/2 in bolts. Ground wire must have a crimp terminal with a corresponding diameter bolt hole. Connect the crimp
terminal and ground bus together using the appropriate diameter bolt.
4400 Series Installation and Operation Manual – 64527-008
TABLE 9.4: UPS MINIMUM BREAKER RATINGS
TABLE 9.5: DC (BATTERY) MINIMUM BREAKER RATINGS*
Be sure to ground the UPS as specified.
Using the UPS without a proper ground will deteriorate the insulation,
cause leakage of currents and electric shock. The resistance to
ground should be less than or equal to 10 ohms.
) or larger cable