what size riser do I use for 100 amp service if I attach the service cable to the riser. What size riser do I need if I attach to the roof?
All power companies require 2" RMC and strapped in 3 places between the weather head and meter or in between the roof and meter. you can go onto the power company's website and type "Meter requirements in the Search bar"
To say "require" is close, but just a tad bit strong. One power company I have worked with also permits Intermediate Metal Conduit. And the 2" minimum is only for mast-supported service drops. Where the riser does not serve as a mast, smaller conduit (or just cable) is permitted.
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