Maximum Length Cable Run,
feet/meters at the baud rate
A = Alpha, B = Belden, C = Consolidated, E = Essex, M = Manhattan, O = Olflex
• = Limited to 16 taps at 38.4 Kbaud
* = not known
**= Suitable for applications requiring high flexibility, continuous flex, or vibration
NEC classes are based on data obtained from manufacturers and are
subject to change. CANADIAN CEC codes are similar. Other countries may
vary.
The serial bus can be treated as a Class 2 circuit when appropriate wiring
practices are followed. Maximum available bus lengths may be affected
when installation requires the high voltage CM (Communications) rating.
CM types can replace CL2, but not vice versa.
Do not mix cables of different impedance, regardless of cable run length.
Do not mix cable types in long and/or noisy installations. Other, small-
size twisted pair shielded wire of unspecified impedance can be used for
short runs of 50 feet or less, using 75-ohm terminations. The selection of
wire type may be limited by local and national codes and industry
standards. Consult the cable manufacturer to determine the cable's
suitability for a particular type of installation.
Conservative wiring practices and national and local codes require
physical separation between control circuits and power distribution or
motor power. Refer to sections 430 and 725 of the National Electric Code.
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