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ORCA BTX-Series ORCA Gateway Hardware Manual
edgeable of applicable municipal electrical code requirements.
Caution
Before connecting the AC or DC power mains, a separate
ground strap (which is connected to a centralized ground network in the installation site) must be connected to the ground
terminals at the rear of the 8-slot unit. The strap used for
this purpose must be 10 AWG in size or larger. A dual #10
hole ring lug must be securely crimped to the end of the wire
that connects to the gateway ground terminal.
1. Place the two-hole ring lug of the ground strap over the
threaded studs of the ground terminal.
2. Fasten a #10 lock washer and a 10-32 nut on each
threaded stud. Tighten each nut to a torque of 29.7 in/lbs
(0.34 kg/m). See Figure 28.
Earth Ground
10 AWG
Grounding Strap
Figure 28. 8-Slot Ground Terminal Posts
DC Power Cable Requirements
The cable pair used for connecting the DC terminals at the
rear of the 8-slot chassis must be:
90
•
Type STO wire
•
minimum size 26 AWG
•
Supplied with #8 ring terminal lugs for terminal connection
•
Connected to a fault current protected 48VDC power
feed.