Tait T809-10, Руководство по обслуживанию

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MBZ-00001-01
Installation Guidelines 21
Copyright © 2004 Tait Electronics Ltd November 2004
Figure 3.2 Protection device with remote sense connected
Note: The purpose of the
heavy gauge
wire between the power supply and the
protection device is twofold: it carries the power supply fault current, and it
ensures the low voltage drop necessary for proper remote sense operation.
3.2.2 Wire Gauges
The wire used to connect the power supply output to the load must be rated for the
maximum current it will carry, at maximum ambient operating temperature. The
required wire gauge will also be determined by whether the wiring is between the
power supply and the protection device (3.2.2.3), or between the protection device and
the load (3.2.2.4).
3.2.2.3 Between Power Supply and Protection Device
The wire length between the power supply output and the protection device is essen-
tially unprotected and must be rated for the power supply’s overload current (that is,
48A max). The minimum allowable wire gauge for this connection also depends on the
type and temperature rating of the wire insulation.
The minimum recommended wire sizes for a maximum operating temperature of 60°C,
are as follows:
Wire Temperature/Insulation Wire Gauge
90°C PVC or Neoprene
8mm
2
CSA (Cross Sectional Area)
(8AWG – American Wire Gauge )
Remote
sense
+
–
V Out
Heavy gauge wire
Load
(e.g. transmitter)
Power supply
+V
–V
Protection
device
(designed to carry power
supply fault current)