AMETEK ReFlex - Manual (Page 111)

AC Power Supplies ReFlex Power™
4-26 M380056-01 Rev K
O PTIONAL I NTERFACE C ONNECTOR A CCESSORIES
• AMETEK P/N 5380508-01, 9-pin Loop-back Connector Assembly. Includes a jumper wire between
Pins 1 and 6 to enable the module outputs.
• AMETEK P/N 5380443-01, Power Module, 9ft. Unterminated Interface Cable Assembly. Use when
interfacing to an external system.
• AMETEK P/N 5380443-03, Power Module, Right Angle, 9ft. Unterminated Interface Cable
Assembly. Use when interfacing to an external system.
4.4.8 W
IRE
S
ELECTION
Input/output wiring must have a current carrying capacity compatible with the
current rating of the ReFlex Power™ system. The maximum current rating of
a wire is dependent on the materials used in its construction, and is primarily
limited by the insulation. The current must be limited so that the temperature
rise of the wire does not result in an operating temperature that exceeds the
rating of the wire.
W IRE C URRENT C APACITY
Table 4-4 shows maximum current ratings, based on a cable of three
conductors, that will produce an approximate 30ºC temperature rise above
ambient. When wiring must operate in areas with an elevated ambient
temperature or bundled with other wiring, heavier gauges or higher
temperature-rated wiring should be used.
Although wire with higher temperature rated insulation will allow operation at
higher currents, the total voltage drop would also be increased for a given wire
gauge. For applications where voltage characteristics, such as regulation, are
important, it may be necessary to size the wire based on total voltage drop
instead of temperature rise.
Table 4-4. Wire Data
AWG
Copper Area,
cm
2
Resistance,
Ω/m at 20°C
Resistance,
Ω/m at 100°C
Current Rating,
A for 30ºC Rise
6 0.133 0.0013 0.0017 54
8 0.0837 0.0021 0.0028 40
10 0.0526 0.0033 0.0044 27
12 0.0331 0.0052 0.0069 21
14 0.0208 0.0083 0.011 16
16 0.0131 0.0132 0.0174 12
18 0.00823 0.0209 0.0276 10
20 0.00518 0.0333 0.044 7.5
22 0.00326 0.053 0.07 5.5