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In the top pic from left to right are 230kV, 138kV, and 69kV. The bottom pic is 345kV. We don't have 500kV here. Insulators can help, but they definitely shouldn't be your sole means of identification. Our entire primary distribution system is 12.5kV with the exception of a couple of test areas...

I work for the local utility (transmission, not distribution), but don't have too many decent pictures to share. You're welcome to guess at these though... (Hint: they're all different voltages)