Remote Termination Panel (Rtp); Terminal Block-To-Field (Signal) Wiring; Table 12 - Minimum Recommended Wire Sizes - Honeywell 900U02-0100 User And Installation Manual

6.3.

Remote Termination Panel (RTP)

The optional Remote Termination Panel (RTP) provides an easy way to connect the ControlEdge HC900
controller to the field wiring. The RTP integrates some of the typical externally connected components,
reducing wiring and setup time. It also minimizes the need for multiple wires under a single screw
connection by expanding the connectivity of the shared terminals of the I/O modules.
See Appendix - Installation of Remote Termination Panels (RTPs) page 221 for details.
6.4.

Terminal Block-to-Field (Signal) Wiring

Although both of the two available terminal block styles can be used on all I/O module types, wiring
methods vary with the module type and with the type of field devices connected to the terminal block.
The descriptions that follow provide details.
Wiring can be routed through the terminal block at the top, at the bottom, or both. Wiring should be fixed
in place using wire ties at the slotted tabs that are molded in at top and bottom of each terminal block.
Wiring Rules and Recommendations
In general, stranded copper wire should be used for non-thermocouple electrical connections. Twisted-
pair wiring with shielded cable is recommended and will improve noise immunity if wire routing is
suspect.
Wire Gage
Observe all local codes when making power connections. Unless local electrical codes dictate otherwise,
the recommended minimum wire size for connections is given in Table 12.
Wire Wire Application
Gauge
14
14 to 16
10 to 14
20
22
Routing and Securing Wires
Typically, field wiring is routed to connections at a terminal panel near the controller 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. (See Electrical Considerations
page 59.)
Also, all wires must be securely terminated, using appropriate wiring practices.
84 ControlEdge HC900 Process & Safety Controller User and Installation Manual
Table 12 – Minimum Recommended Wire Sizes
Earth ground to common power supply.
AC to power supply
Earth ground wire
DC current and voltage field wiring
DC current and voltage wiring in control room
Revision 10
May 2019