I need to add ethernet cables to my business. Above the t-bar ceilling i have all the electrical wires 120 & 240 volts inside several metal pipes. If i run cat7 cables inside one pvc pipes that runs parallel next to the metal pipes. Is it going to cause problems? Interferences? Pipes run 100 feet long. Thanks
Ethernet uses differential signalling. This means that any noise applied to both conductors of a pair will cancel out. In addition the metal pipes will block a lot of interference, as it essentially forms a Faraday cage around the current carrying cables.
In addition, ethernet provides galvanic separation between the internal circuits of the computer, and the cable.
In short: don't worry. 100ft is not a long stretch, and currents in homes are rather clean, with small or no frequency converter loads, and the currents are rather small (<50A).
I work with industrial control systems. We use Ethernet inside switchboards with frequency converters rated in the thousands of kilowatts-range. It works fine.
Ideally, any copper low voltage wire used for data, when run parallel to line voltage wiring should be kept 18" away and only cross line voltage at 90 degrees to eliminate inductive coupling. However, metallic conduit such as EMT shields the interference from the line voltage, assuming it is properly grounded. You should have no problem.
Why run pvc conduit? Why not just get CADDY datacom bridal rings and T-Bar wire clips? Cheaper, easier, less weight, easier to get into an existing T-bar ceiling, etc. https://www.erico.com/caddy.asp