External Breakers; Grounding Wire - Toshiba 4400 Series Installation And Operation Manual
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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 9.2 shows the minimum external breaker rating for each UPS. The bypass, input and output require
3-pole breakers.
Voltage
15kVA
208/120V
240V/60A
220/127V
240V/60A
240V
240V/50A
380/220V
480V/40A
400/227V
480V/30A
415/240V
480V/30A
480/277V
480V/30A
600V
600V/25A
Voltage Cpacity
(Min.)
400VDC
* For Battery Cabinet Systems not equipped with built-in over-current protection devices.
9.6
Grounding Wire
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
or larger cable for the grounding wire. Connect the crimp terminal and ground bus together using a M4 bolt.
The 80kVA 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.
46
TABLE 9.4 UPS MINIMUM BREAKER RATINGS
20kVA
25kVA
240V/80A
240V/100A
240V/70A
240V/90A
240V/70A
240V/80A
480V/50A
480V/50A
480V/40A
480V/50A
480V/40A
480V/50A
480V/35A
480V/40A
600V/30A
600V/35A
TABLE 9.5 DC (BATTERY) MINIMUM BREAKER RATINGS*
15kVA
20kVA
25kVA
70A
90A
WARNING
4400 Series Installation and Operation Manual – 64527-006
Capacity
30kVA
240V/110A
240V/200A
240V/110A
240V/175A
240V/100A
240V/175A
480V/60A
480V/100A
480V/60A
480V/100A
480V/60A
480V/90A
480V/50A
480V/90A
600V/40A
600V/70A
30kVA
50kVA
110A
150A
225A
50kVA
80kVA
240V/300A
240V/300A
240V/300A
480V/175A
480V/175A
480V/150A
480V/150A
600V/110A
80kVA
350A
)
2
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