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Once the equipment has been finally positioned and secured, connect the power cables as
described in the following procedure.
Refer to the appropriate cable connection drawing in 2.0 - Installation Drawings.
1.
Verify that the bypass equipment is isolated from its external power source and all the power isolators are
open. Check that these supplies are electrically isolated and post any necessary warning signs to prevent
their inadvertent operation.
2. Open the door to the cabinet and remove the interior panels.
3.
Connect the ground and any necessary main bonding jumper to the equipment ground busbar.
NOTE
The grounding and neutral bonding arrangement must be in accordance with local and national
codes of practice.
NOTE
Care must be taken when routing power cable. Ensure that cables do not touch other busbars
(see Figure 10).
NOTE
Do not double-stack lugs: do not layer two lugs on the same side of the busbar (see Figure 10).
4. Connect the AC input supply cables between the power distribution panel and the Maintenance Bypass input
supply busbars (A-B-C or A-B-C-N terminals) and tighten the connections to the proper torque. Ensure
correct phase rotation!
5.
Connect the UPS Input
a.
For two-breaker Maintenance Bypass Cabinets
1.
If the system is a three-input type, connect the AC input supply cables between the power distribution
panel and the UPS bypass input supply busbars (A-B-C or A-B-C-N terminals) and between the power
distribution panel and the UPS rectifier input supply busbars (A-B-C or A-B-C-N terminals). Tighten
the connections to the proper torque. Ensure correct phase rotation!
2. If the system is a two-input type, connect the AC input supply cables between the Maintenance Bypass
Cabinet and the UPS bypass input supply busbars (A-B-C or A-B-C-N terminals) and between the
power distribution panel and the UPS rectifier input supply busbars (A-B-C or A-B-C-N terminals).
Tighten the connections to the proper torque. Ensure correct phase rotation!
6. Connect the system output power cables between the Maintenance Bypass Cabinet output (A-B-C or A-B-C-
N terminals) and the critical load and tighten the connections to the proper torque. Ensure correct phase
rotation!
7.
Connect the auxiliary cables of any external interface/signals to the respective connections of the output
auxiliary terminal block (X4) (see 2.0 - Installation Drawings).
8. Replace interior panels and close door.
®
Vertiv
| Liebert
NXL
™
™
MBC
250-500kVA Installation Manual |
Single-Module Mechanical Installation
8
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