(C) Conductors of Different Systems.
(1) 1000 Volts, Nominal, or Less. Conductors of ac and dc
circuits, rated 1000 volts, nominal, or less, shall be permitted to
occupy the same equipment wiring enclosure, cable, or raceway.
All conductors shall have an insulation rating equal to at
least the maximum circuit voltage applied to any conductor
within the enclosure, cable, or raceway.
Secondary wiring to electric-discharge lamps of 1000 volts or
less, if insulated for the secondary voltage involved, shall be
permitted to occupy the same luminaire, sign, or outline lighting
enclosure as the branch-circuit conductors
Informational Note No. 1: See 725.136(A) for Class 2 and
Class 3 circuit conductors.
Informational Note No. 2: See 690.4(B) for photovoltaic source
and output circuits.
Low voltage and high (in the consumer sense) voltage in the same raceway is not really the issue. It is power (Chapter 3) versus Limited Power (which happens to also be limited in maximum voltage).Low voltage and high voltage can not be on the same race way. The can also interfere with the transfer of data.
Low voltage and high voltage can not be on the same race way. The can also interfere with the transfer of data.
Low voltage and high (in the consumer sense) voltage in the same raceway is not really the issue. It is power (Chapter 3) versus Limited Power (which happens to also be limited in maximum voltage).
"I mean inside say an industrial control panel you can literally have a CAT 6’with a 600 V AWM rating tie wrapped to 500 MCM THWN-2. It is legal and it works. "
Wow, if you say so I believe you...We were always required to not parallel it with power, and to cross at right angles.
I'm not going to disagree with you on Ethernet cabling. I was in the force and motion control world, hydraulic and electric. Our control devices (servo, proportional, and pressure valves) (electric servo motors) typically had frequency response to the very low hundred Hertz. Our signal cabling was typically high impedance (4.7-47 kOhm), rarely 4-20 mA, and in a cable containing 4 to perhaps 12 "cores" including DC power. Coupling from power, depending on level, would commonly be seen in the controlled variable OR in the intentional dither by the electronic device. Frankly, the addition to the dither wasn't usually a problem. The beating with dither signals did weird things however. I often found 2 problems, interrupted shielding and parallel runs, to create these symptoms. In a control panel, I requested 12" spacing to power cabling if parallel, and 90 degree crossing when crossing was required. More than 1 time we found magnetic shielding to help things (often a sleeve of EMT). We denied responsibility if signal (with their DC power) cables shared conduit from machine to cabinets.
Yes, the manufacturer can install it that way in their equipment, but even inside the listed equipment the electrician cannot install it that way....I mean inside say an industrial control panel you can literally have a CAT 6’with a 600 V AWM rating tie wrapped to 500 MCM THWN-2. It is legal and it works. But it’s also part of a Listed assembly...the manufacturer has to get an NRTL to approve the panel. But the moment it exits the enclosure it falls under NEC rules and needs separate raceway.
It is interesting and thus-- catches my attention when someone shows confidence albeit assertiveness in making a point.
I'm anxious to hear what your "debunking" ideas are... Now, try debunking that.
Every data packet that is streaming down the data highway has it's own unique identity, the message it is carrying, the destination address, the length of the packet and most important-- the manner it is being delivered.
All of these attributes are generated and reported to the client computer where the data were meant to be received.
If any of the details are not received by the client as described-which also indicate that a page is not found- those particular packets are discarded. . .and an error 404 code message will show up on the screen.