How Should I Network This Video System?

Proposed plan to put in 8 cameras on a site, 3 are no brainers.

The other 5 cameras are 400+ feet from Nvr.

There is a electrical bldg 230 feet away. My plan is to put a PoE switch in bldg, as cameras are going to be fixed units.

I was just going to run 2 cat 5-6 to electrical bldg from main bldg. Ideas? Suggestions?

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