4 Chapter 2 Installation Instruction
NetSure 731 A41 Subrack Power System User Manual
Table 2-3 DC load cable CSA selection
Load route
rated current
Max. output
current
Min. cable
CSA
Max cable length ( volt drop: 0.5V
with min. CSA)
Max. cable
CSA
Max cable length ( volt drop: 0.5V
with max. CSA)
63A
50A
16mm2
9m
25mm2
14m
32A
25A
10mm2
11m
25mm2
29m
16A
12A
6 mm2
14m
25mm2
48m
Note: The specs are applicable at ambient temperature of 25°C. If the temperature is higher than this, the CSA of the cable should
be increased.
To prevent the air switching capacity is too large, the load doesn't work when overload. Recommended the capacity
of the air switching is up to 1.5~2 times of the load peak.
The CSA of the system grounding cables should be consistent with the largest power distribution cables. The CSA
value is no less than 25mm2.
AC distribution
、
DC distribution interface definition see Table 2-4.
Table 2-4 AC distribution
、
DC distribution interface definition
Connector name
Connector specifications
Wiring instruction
AC power
distribution
AC input MCB
H type terminal, max. cable CSA 50mm2
AC power line
Grounding busbar
One M8 bolt, OT type wiring terminal, max. cable CSA 35mm2
Connected to the
grounding bar of the
building
DC power
distribution
Battery output MCB
H type terminal, max. cable CSA 50mm2
Connected to the
battery port
Negative output MCB
H type terminal, max. cable CSA 25mm2
Connected to the users
negative load port
Positive busbar
Terminal subrack terminal
：
cable CSA ≤ 50mm2
Connected to the users
positive load port
2.3 Mechanical Installation
Note
1. The cabinet or rack that installed in the subrack must provide fireproof and electric protection casing, or install in cement or
other difficult to burn, at the same time keep enough distance to other combustible material.
2. For the convenience of maintenance, users should maintain a clearance of 800mm at the front of the power system.
3. Subrack cannot be installed against the wall, it must leave enough space for heat dissipation.
Installed on the battery rack
Fix the subrack power system to the battery rack through the connectors with M6 bolts, as show in Figure 2-1.