All network cables run from the outlets to the server room. They run next to power cables so it was decided to shield them. In the server room, they are going to be connected to a patch panel which will be grounded. From the patch panel, the cables will be connected to the switch.
I've heard that it is necessary to use shielded patch cords from outlets to PCs, but do I need to use shielded patch cables from patch panel to the switch? I don't expect much EM waves in the server room if that matters.
Best Answer
You cannot mix shielded and unshielded components of a cable system. If shielded cabling is used, it must be shielded from end-to-end, and grounded, at least on both ends.
There are documents that explain things for you. For example, Shielded and unshielded twisted-pair cable revisited:
Shielding on a cable primarily makes up for poorly designed/constructed cable. If you have both shielded and unshielded cable with the same ratings, you really gain no advantage using shielded cable. Properly installed, both will have the same characteristics of noise immunity, and improperly installed shielded cable will be much worse.
Your power cables run at a vastly different frequency than network signals, so you should not expect interference from that. A bigger concern is the applicable law. For example, in the U.S., it is not allowed to run power and network cables in the same path, and the AHJ (building inspector, fire marshal, etc.) can red-tag the building (preventing occupation and use) and levy fines until the situation is corrected.
When running cabling, you should also consult the ANSI/TIA-569-C Commercial Building Standard for Telecommunications Pathways and Spaces. Here is an overview document, and what it says about that:
The NEC (National Electric Code), NFPA 70, also has much to say about cabling. It has been adopted by all 50 states and most local jurisdictions. It doesn't just deal with power lines; there is quite a bit of it which deals with low-voltage (network) cabling.
Commercial building cabling is not a DIY project anymore. The frequencies used by modern networks, and the codes, ordinances, legal requirements, etc. of cabling all make it necessary to have cabling properly installed and tested by certified cable installers. The test equipment necessary to properly certify cable can cost several thousand dollars, and it requires experience to use properly and to be able to correct any problems discovered during testing.