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I make all the electrons line up for their Flu shots
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It is up to the power company of your area.
 

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I had to do a 3" mast for a 300 amp service once. Between the 3" pipe and the bulbous meter pan the thing looked like something for the challenger space shuttle attached to the side of the house. It should have been underground but it wasn't my call there.
 

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On Long Island we're required to install a 2 1/2 inch mast. 3 inch if it's more than 5 ft above the roofline.
 

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Here we use...

1-1/4 for 18 inches above the roof
1-1/2 for 2 feet
2" for 3 feet above the roof and/or a pull of 30 meters.

then there is the 8x8x20 foot posts we bolt onto the side of a building and run a pvc up.

Edit: We don't fool with a mast. She is bolted with two 1/2 bolts to the structure. One near the meter base and one near the eave, always at least 18 inches apart. Mast bolts we call them.
 
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