what effect would a power cable have on a 24v signal cable running parallel to a new installation have, and would separating them be enough to stop interferance or would i be best to use a screened cable for the 24v signal cable?
2007-05-07 05:09:04 · 5 answers · asked by acdonkey 1 in Science & Mathematics ➔ Engineering
Separating them at least 6" may be sufficient to stop the signal cable picking up the emf from the mains. If not a screened cable should do the trick.
2007-05-07 05:19:59 · answer #1 · answered by jayktee96 7 · 1⤊ 0⤋
There are two issues associated with power limited circuits run in the vicinity of power circuits. The first issue is unintentional contact. The power-limited conductors need to be separated from power conductors to prevent the low voltage cabling from being energized at the higher voltages.
The second issue is electromagnetic interference. To prevent "noise" or other electrical disturbances from being induced into the signaling circuits, a separation of at least 2" is needed.
Shielded cable is advisable where interference from "outside" sources is likely to cause distribution to the signaling circuit. Unless the installation is in a high lightning strike area or the arrangement of electrical lighting and power is likely to induce noise into the circuit, shielded cable is not necessary and may actually cause it's own ground loop and noise if not bonded correctly.
2007-05-07 05:27:07 · answer #2 · answered by Bryan H 3 · 0⤊ 0⤋
there would be alot of interferance even if u screened the multicore cable carrying the 24V its wot we call a spike its not so much the voltage in the power cable but the Hz that apllied 50hz wud effect it but 60hz wud do even more its best to keep them away from each other especialy if ur operating sensitve equipment on the 24V line.
2007-05-09 00:01:26 · answer #3 · answered by Ace 2 · 0⤊ 0⤋
It all depends on how long they run close to each other, and what type of signal you intend to carry on your 24v signal cable.
If two wires run close to each other, they will couple both inductively and capacitively. In high impedance/low voltage environment, the impact may be significant.
You can use SHIELDED (not screened) wire, but it will still couple to the shield. I believe electrical code in most states require you do not put signal and power cable in the same conduit.
2007-05-07 05:18:23 · answer #4 · answered by tkquestion 7 · 0⤊ 0⤋
We experience this situation in Lift Engineering quite a bit, we generally find the solution is screened cable with twisted pair of wires for the supply, don't forget to earth on end of the screen though.
In the past to remove already existing induction problems I have connected a 150,000 ohm resistor and that has solved it
2007-05-07 05:23:56 · answer #5 · answered by superliftboy 4 · 0⤊ 0⤋