Honeywell ControlEdge 900R04-0200 Getting Started page 26

Chapter 3 - Hardware
26
Routing and securing wires
Typically, field wiring is routed to connections at a terminal panel near
the racks, and then from the terminal panel to the terminal blocks on
the I/O modules.
Whatever method of routing is used, wiring must be mechanically
supported along its length, and must be protected from physical
damage and electromagnetic (noise) interference.
ATTENTION: All wires must be securely terminated, using
appropriate wiring practices.
Wire shield grounding
Aluminum grounding bars for I/O wiring are available as options.
When selected for use, they are fastened to the top and/or bottom of
each rack, as indicated in the following figure. To enable connection
of multiple ground wires with a single screw, the wires can be twisted
together and secured with a wire lug.
Figure 3-7: Wire-Shield Grounding
To facilitate module replacement, it is advisable in most cases to route
all wiring through either the top or the bottom of the terminal block.
This allows the terminal block to pivot up or down, allowing ready
access to the module, and is the preferred method for a limited
number of wires.