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4400 Series Installation and Operation Manual – 64527-008
9.5 External Breakers
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.
TABLE 9.4: UPS MINIMUM BREAKER RATINGS
Voltage
Capacity
15kVA
20kVA
25kVA
30kVA
50kVA
80kVA
100kVA
208/120V
240V/90A
240V/125A
240V/150A
240V/175A
240V/250A
240V/400A
240V/500A
220/127V
240V/90A
240V/125A
240V/150A
240V/150A
240V/250A
240V/400A
240V/450A
240V
240V/80A
240V/100A
240V/125A
240V/150A
240V/225A
240V/350A
240V/400A
380/220V
480V/50A
480V/70A
480V/80A
480V/90A
480V/150A
480V/225A
480V/300A
400/227V
480V/50A
480V/60A
480V/70A
480V/90A
480V/150A
480V/200A
480V/250A
415/240V
480V/45A
480V/60A
480V/70A
480V/80A
480V/125A
480V/200A
480V/250A
480/277V
480V/40A
480V/50A
480V/60A
480V/70A
480V/110A
480V/175A
480V/200A
600V
600V/35A
600V/40A
600V/50A
600V/55A
600V/85A
600V/150A
600V/175A
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”.
TABLE 9.5: DC (BATTERY) MINIMUM BREAKER RATINGS*
Voltage Capacity
(Min.)
15kVA
20kVA
25kVA
30kVA
50kVA
80kVA
100kVA
500VDC
100A
150A
175A
200A
350A
600A
700A
* For
Battery Cabinet Systems not equipped with built-in over-current protection devices.
9.6 Grounding Wire
WARNING
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.
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
2
) or larger cable
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.
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