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MITSUBISHI
ELECTRIC
3.4 Procedure for Cable Connections
I.
Confirm the capacity of the UPS being installed. Identify the input/output power terminal
blocks as shown in Figure 3.2.
II.
Connect the grounding conductor from the input service entrance to the UPS grounding
bar.
II.
Confirm that an external input circuit breaker is installed and its current rating is
appropriately. (Refer to Table 1.2 in Section 1.1)
III.
Connect the AC/DC power cables from the input service entrance to the UPS' power
terminals identified in Figure 3.2. The cables must be sized for an ampere rating larger
than the maximum current capacity of the system. (Refer to Table 3.3 for recommended
cable sizes)
V.
Connect external signal terminal block as needed. Refer to section 2.2 and Figure 2.5 for
functional description. 12 AWG, or less, shielded conductor is recommended.
NOTES: 1. Confirm that all UPS internal contactors (breakers) "CB1", "CB2", and "CB3" are open
before energizing UPS.
2.
UPS power terminals are attached to the bolts and nuts. It is recommended that
compression lugs be used to fasten all input/output power cables. Refer to Table 3.4 for
recommended compression lugs and appropriate crimping tool
TABLE 3.3 Recommended Cable Size and Torque Requirements
UPS
Capacity (kVA)
30kVA
50kVA
*1 - The cables must be selected to be equal to the sizes listed in the table.
*2 - Voltage drop across power cables not to exceed 2% of nominal source voltage.
*3 - Allowable ampere ratings based on 75ﾟC insulation at an ambient temperature of 40ﾟC.
No more than 3 conductors in a raceway without de-rating. Copper conductors assumed.
2033G SERIES UPS
OWNERS / TECHNICAL MANUAL
Input / Output Side
Cable Size
Torque
(AC208V)
(in. lbs)
1/0 AWG
100-135
4/0 AWG
100-135
MITSUBISHI ELECTRIC 2033G SERIES UPS
Page Number:
3-3
DC Input Side
Cable Size
Torque
(DC 491V)
(in. lbs)
4 AWG
100-135
1/0 AWG
100-135
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