NetApp DS4246 User Manual

Recommended power line sizes
When installing your storage system, you must determine the AC and DC power line lengths
running from the storage system to the power source.
Recommended AC power line sizes
By properly designing longer AC power feeds, you can preserve voltage levels to the equipment.
The longer power feeds—the wiring from the breaker panel to the power strip, which supplies
power to the storage system and disk shelves—can often exceed 50 feet.
Note: Total AC wire length = breaker to wall or ceiling outlet + extension cable or ceiling drop.
The following tables list the recommended conductor size for 2 percent voltage drop for a
particular distance measured in feet (taken from the Radio Engineer's Handbook). The circuits in
the following tables are described in American Wire Gauge (AWG) measurements:
110V, single-phase
20A circuit 30A circuit 40A circuit 50A circuit
25 feet 12 AWG 10 AWG 8 AWG 8 AWG
50 feet 8 AWG 6 AWG 6 AWG 4 AWG
75 feet 6 AWG 4 AWG 4 AWG 2 AWG
220V, single-phase 20A circuit 30A circuit 40A circuit 50A circuit
25 feet 14 AWG 12 AWG 12 AWG 10 AWG
50 feet 12 AWG 10 AWG 8 AWG 8 AWG
75 feet 10 AWG 8 AWG 6 AWG 6 AWG
The following table lists the approximate equivalent wire gauge (AWG to Harmonized Cordage).
AWG
8 10 12
Harmonized, mm-mm
mm-mm = millimeter
squared
4.0 2.5 1.5
Calculating the length of DC wires for DS4243 disk shelves
If your DS4243 disk shelf is using DC power supplies, you must calculate the maximum combined
length of the positive and negative wires that connect the DC source and DC power supply by
using the variable definitions and examples provided.
Variable definitions
V
SOURCE
Voltage across the internal source resistance
V
OC
Voltage across an open circuit of the input source
V
LOAD
Voltage across a load, R
TEST'
connected to the input source
R
TEST
Test resistor of known value, that is, 10Ω at 300W
DS4243, DS2246, DS4486, and DS4246 Installation and Service Guide 64
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