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Series 780S Instruction Manual Chapter 2 Installation
IM-78S-B 2-5
Input Power Wiring
AC Power Wiring
The AC power wire size must be 26 to 16 AWG with the wire
stripped 1/4 inch (6 mm). Connect 100 to 240 VAC (300 mA load,
maximum) to the Neutral and Line terminals on the small, two-
position terminal block. Connect the ground wire to the safety ground
lug. Torque all connections to 4.43 to 5.31 in-lbs (0.5 to 0.6 Nm).
For all installations not using solid metal conduit, the ferrite clamp
must be installed just above the input power wire entry into the en-
closure (Figure 2-5). All EEx installations must use an approved
EEx fitting at both cable entries into the enclosure. If conduit seals
are used, they must be installed with 18 inches of the enclosure.
The Hazardous-Area enclosure has two separate conduit entries to
maintain separation between AC input power and output signal wir-
ing. To eliminate the possibility of noise interference use a separate
cable entry for the AC power and signal lines.
Enclosure
safety
ground lug
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
AC Power (Line)AC Power (Neutral)
Hazardous-Area Enclosures
Figure 2-4. AC Input Power Connections
Figure 2-5. Ferrite Clamp Installation
Warning!
All wiring procedures must
be performed with the power
Off.
Caution!
The AC wire insulation tem-
perature rating must meet or
exceed 71°C (158°F).