3: Installation Planning
20
TS_610_01 PowerWAVE 6000 S3 (60-120kVA) User Manual 21/10/19
3.3
Electrical and cabling planning
3.3.1 General requirements
The information in this section should help with the preparation and planning of the UPS power cabling.
The UPS input mains and bypass mains terminals should be connected to the utility mains supply through a LV-
Distribution board that contains suitable circuit breakers or fused isolators. These are necessary to provide a means of
isolating the UPS from the mains supply when required and provide suitable overload protection. Similarly, the UPS output
supply terminals should be connected to the load equipment via a fused load distribution board.
Input neutral grounding
A permanently connected input neutral is required to
enable the rectifier to operate correctly and allow the
UPS to function properly. The input neutral must also be
grounded to ensure correct operation when the UPS is
running on battery.
3.3.2 Cable and fuse sizing
Single feed / Dual feed inputs
The UPS can be wired for a ‘single feed’ input (standard), whereby the UPS input mains terminals and bypass mains
terminals are internally linked; or it can be wired for a ‘dual feed’ input, where the UPS bypass terminals are connected to
a dedicated bypass mains supply.
These configurations are shown in Figure 3.3 (single feed) and Figure 3.4 (dual feed), together with a table showing the
maximum current requirements of the input mains, bypass mains, and UPS output cables. It is left to the customer to
select and provide suitable cables and protective devices in accordance with national and local regulations.
Battery fuses and cables
Figures 3.3 and 3.4 do not show battery fuse and cable sizing details as these are bespoke to the installation.The DC
cables and fuses will be provided by Kohler Uninterruptible Power Ltd but it is the customer’s responsibility to provide any
necessary cable containment. The following table is provided for information only.
IMPORTANT NOTE:
The UPS does not contain internal fuse protection for the bypass mains, input mains (rectifier), or battery cables. It is the
customer’s responsibility to ensure that external supply fuses (or other protective devices) are correctly sized to provide
the recommended level of UPS protection. We also recommend that a spare set of fuses are held locally to ensure they
are readily available if required.
Key Point:
As the input neutral must be
unswitched and connected to the UPS at all
times, a 4-pole input switch or isolator must
not be used at the LV Distribution board on a
TN-S system.
Key Point:
All external fuses, isolators and power cables must be rated and installed in accordance with the
prescribed IEC standards or local regulation – e.g. BS7671.
UPS Rating
Fuse E
(lg/CB)
Cable E
(Qty x mm²)
60 kVA
2x 160A
2x (1x 50)
80 kVA
2x 200A
2x (1x 95) for 42-45 battery blocks
2x (1x 70) for 46-50 battery blocks
100 kVA
2x 250A
2x (1x 120) or 2x (2x 50)for 42-45 battery blocks
2x (1x 95) for 46-50 battery blocks
120 kVA
2x 300A
2x (1x 150) or 2x (2x 50) for 42-45 battery blocks
2x (1x 120) or 2x (2x 50) for 46-50 battery blocks
0V
230V
UPS
Figure 3.2 Input neutral grounding
