Ac Delta Power Shelf - Cisco SRS Series Installation Manual

Installing and Removing Power Components
Note We recommend that you rotate the L1, L2, and L3 cable conductor connection for the two power shelves to
improve system availability due to common phase outage.
Note The ground cable conductor connector nuts have a 20 in.-lb (2.26 N-m) torque value, and the power cable
conductor connector screws on the terminal block have a 9 in.-lb (1.04 N-m) torque value.

AC Delta Power Shelf

The AC Delta power shelf arrives with a 4-wire Delta cord and an IEC 60309 plug rated 250 V/60 A, IP67,
3W+PE; it is 4 meters long. The power shelf has four corresponding terminations: three active ("hot") and
one ground. The ground lug and terminal block are located behind a removable cover on the rear of the power
shelf. The terminal block contains three terminations to attach the three active cable conductors from the input
power cord. The ground cable conductor from the input power cord is attached to the ground lug.
The rear of the AC Delta power shelf with the rear cover removed is shown in this figure.
Figure 21: AC Delta Power Shelf Rear
1 Lead 1 (L1)
2 Lead 2 (L2)
Note
Leads 1, 2, and 3 (L1, L2, and L3) are not associated with any particular color of cable conductor because
they are not connected to neutral or the safety ground (4).
Note
We recommend that you rotate the L1, L2, and L3 cable conductor connection for the two power shelves to
improve system availability due to common phase outage.
3 Lead 3 (L3)
4 Ground
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AC Delta Power Shelf
35