NetApp DS4246 User Manual

AWG Strand DC resistance
1
[Ω/ft.] Total cable length
2
[ft]
25°C 75°C 25°C 75°C
12 7/20 .0015 .0018 85 71
12 19/25 .0017 .0020 75 64
12 65/30 .0018 .0022 71 58
12 165/34 .0016 .0019 80 67
1
Data from Alpha Wire, wire manufacturer
2
Combined positive and negative run
Example 2
This example uses the following given values:
Given
V
DROP
= 2V Maximum voltage drop through input source
and cable
V
MIN
= 40V Minimum input voltage
I
MAX
= 8.6A Maximum input current at 40V
R
SOURCE
0
Solution
V
DROP
= I
MAX
R
TOTAL
R
TOTAL =
V
DROP
I
MAX
R
TOTAL
= 2/8.6
R
TOTAL
= 0.233
R
TOTAL
= R
SOURCE
+ R
CABLE
R
CABLE
= R
TOTAL
- R
SOURCE
R
CABLE
= 0.233 - 0
R
CABLE
= 0.233
For example, if you have a solid-strand, 12-gauge wire at room temperature, you use the following
calculation:
Total cable length =
Total cable length =
R
CABLE
DC resis.
1
.233
.0017 /ft
= 136 ft
DS4243, DS2246, DS4486, and DS4246 Installation and Service Guide 67
Recommended power line sizes

NetApp DS4246 Specifications

General

Data transfer rate	6 Gbit/s
Storage drive size	3.5 \
Storage drive interface	Serial Attached SCSI (SAS)
Storage drives installed	Yes
Installed storage drive type	HDD
Supported storage drive types	HDD & SSD
Total installed storage capacity	40.8 TB
Maximum supported storage capacity	- TB
Number of storage drives installed	24
Chassis type	Rack (4U)
Product color	Black
Device class	Large Enterprise Business
AC input voltage	100-240 V
AC input frequency	50 - 60 Hz
Number of power supply units	2
Operating altitude	0 - 3045 m
Non-operating altitude	-305 - 12192 m
Storage temperature (T-T)	-40 - 70 °C
Operating temperature (T-T)	10 - 40 °C
Storage relative humidity (H-H)	10 - 95 %
Operating relative humidity (H-H)	20 - 80 %

Weight and Dimensions

Depth	610 mm
Width	483 mm
Height	178 mm