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The power company says I can put my permanent service entrance on a 6" x 6" pressure treated post. My friend suggested I consider a metal post sunk in concrete, for greater longevity.

How long should I expect a treated post to last in the ground?

Here's the diagram the power company gives:

Puget Sound Energy Remote Meter diagram

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up vote 6 down vote accepted

Ok Jay. A PT post will last a long time in concrete, maybe 5 to 10 yrs in soil alone. I suggest you imbed the post in concrete, trowel a peak around the post so water runs off, and don't let the PT post come in contact with the ground. If you find the RV posts I mentioned earlier, they are steel , treated and when put in concrete will last 25 yrs or more.

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What is an RV post? Can you provide a link or something? – Coleman Mar 1 '11 at 19:38
pplmotorhomes.com/parts/rv-power-cords/… Google RV power outlets. many suppliers out there. – shirlock homes Mar 2 '11 at 14:21

It will not last long (7 yrs max) if the bottom of the post is wet. If you place stone at the base of the post, it should last 20+ yrs.

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That's common advice, and I believe it's true for most soil types, but for rich clay that doesn't drain well, it may make the situation worse: it will give water a place to pool. – Jay Bazuzi Oct 17 '12 at 3:52

The length of time will also depend on whether it has been cut after manufacture or not as well. The treatment does not always deep seep into the timber, therefore making any post delivery cuts may expose any untreated timber. Always best to retreat a fresh cut before installing.

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