NetApp DS4243 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 DS4243 Specifications

General

Brand	NetApp
Model	DS4243
Category	Storage
Language	English