Engineering Documentation

Appendix A – Discontinued Products
Modular Equipment Controller (MEC) and Point Expansion Module (PXM)
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Appendix A – Discontinued Products
The following products are no longer available for new sales; this information is for
reference only.
Modular Equipment Controller (MEC) and
Point Expansion Module (PXM)
Wire Type Requirements
MEC, MEC with LON, and PXM Points Wire Type Requirements.
Circuit Type Class Wire Type Maximum Distance
1
Conduit Sharing
2
AC Line Power (120V or greater) 1 No. 12 to No. 14 AWG THHN See NEC Check local codes
AC Low Voltage Power 2 No. 12 to No. 18 AWG THHN See NEC Check local codes
Analog Input
1K Ohm platinum RTD
2
No.18 or No.22 AWG TP or TSP
5
CM
(FT4) or CMP (FT6)
3
750 ft (230 m) Check local codes
Analog Input
0-10V
2 No.18 or No.22 AWG TP or TSP
5
CM
(FT4) or CMP (FT6)
3
750 ft (230 m) Check local codes
Analog Input
0-20 mA
2 No.18 or No.22 AWG TP or TSP
5
CM
(FT4) or CMP (FT6)
3
750 ft (230 m) Check local codes
Analog Output
0-10V
2
No.18 or No.22 AWG TP or TSP
5
CM
(FT4) or CMP (FT6)
3
750 ft (230 m) Check local codes
Analog Output
0-20 mA
2 No.18 or No.22 AWG TP or TSP
5
CM
(FT4) or CMP (FT6)
3
750 ft (230 m) Check local codes
Analog and Digital Inputs on SCS 2 24 AWG UTP
6
, solid or stranded. 328 ft (100 m) Check local codes
Digital Input 2 No.14 to No.22 AWG.
TP not required below 1 Hz. at faster
pulse speeds, use TP or TSP
5
; check
job specifications and local codes.
750 ft (230 m) Check local codes
Digital Output 1, 2 No.14 to No.22 AWG.
TP not required; check job
specifications and local codes.
Check local codes Check local codes
MEC Point EXP Bus
4
2 No. 24 AWG TSP
CM (FT4) or CMP (FT6)
3
200 ft (61 m) Check local codes
1)
Wire length affects point intercept entry. Adjust intercept accordingly.
2)
Conduit sharing rules: No Class 2 point wiring can share conduit with any Class 1 wiring except where local codes permit. (Both
Class 1 and Class 2 wiring can be run in the field panel providing the Class 2 wire is UL listed 300V 75°C (167°F) or higher, or the
Class 2 wire is NEC type CM (FT4) (75°C or higher) or CMP (FT6) (75°C or higher). NEC type CL2 and CL2P is not acceptable
unless UL listed and marked 300V 75°C (167°F) or higher.
3)
Twisted pair, non-jacketed, UL listed 75°C (167°F) and 300V cable can be used in place of CM (FT4) or CMP (FT6) (both must be
rated 75°C or higher) cable when contained in conduit per local codes. See the Field Purchasing Guide for wire.
4)
All point blocks wired to an MEC must be daisy-chained. The total wire length from the MEC to the last point block in the chain must
be no longer than 200 ft (61 m). Unlike BLN connections, shield wires to the point blocks must be terminated at both ends.
5)
Twisted Shielded Pair TSP is not required, does not affect MEC specifications, and may be substituted where otherwise specified.
TSP should be used in areas of high electrical noise (for example when in proximity to VFDs and 100 kVa or larger motors). Where
used, connect the shield drain wire to the MEC Shield terminals or equivalent grounding system inside enclosure.
6)
Cable must be part of a Structured Cabling System (SCS).