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EMC Rails and Enclosures (CX4 Series Storage Systems) Field Installation Guide
Power requirements
Power requirements
Power distribution must support the number of outlets required for
the device and the device power rating.
For example, each pair of power distribution panels (PDP) in the
EMC standard 40U-C cabinet can support a maximum of 24 A AC
current draw from devices connected to its power distribution units
(PDU). Most cabinet configurations draw less than 24 A AC power,
and require only two discrete 240 V AC power sources. If the total AC
current draw of all the devices in a single cabinet exceeds 24 A, the
cabinet requires two additional 240 V power sources to support a
second pair of PDPs. Use the published technical specifications and
device rating labels to determine the current draw of each device in
your cabinet and calculate the total.
Note: For high availability, the left and right sides of any rack or cabinet must
receive power from separate branch feed circuits.
Device height requirements
Device height requirements and cabinet mounting measurements are
based on NEMA units (U’s). See Table 1.
The predrilled holes in the cabinet channels are based on the U
measurement. The holes are predrilled at distances of 1/2 inch, 5/8
inch, 5/8 inch (totaling one U), then 1/2 inch, 5/8 inch, 5/8 inch
(another U), and so on. On EMC 40U and 40U-C cabinets, the 1U
increments are marked by a horizontal line or small hole in the
channel. See Figure 2 on the next page.
Table 1 NEMA unit heights
Number of U’s Actual height
1U 1-3/4 inches
2U 3-1/2 inches
3U 5-1/4 inches
4U 7 inches
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