Detached garage sub panel question

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RBM wrote:

But as you said in your first post (if only the thread had ended there...) a grounding electrode is required for either a 3 or 4 wire feeder.
You don't need an electrode if the feed is just a multiwire branch circuit.
--
bud--

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I'm just thinking it would be less cheesy to have a system with a pipe ecg and no rod, than neither
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You may add any supplemental grounding your heart desires. The rule is that the grounded conductor may only be grounded at one location. The grounded conductor is often mislabeled as the neutral, but it is always the "white" wire and is bonded to ground at the service entrance. This is the only location that it is allowed to be bonded. (your meter)
As long as you do not connect the "neutral" (grounded conductor) with the grounding conductor, in this location, any new grounding is okay.
However, lightning protection is generally anecdotal. Essentially, you can't win if it wants you to lose.
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MIB wrote:

As Tom wrote, there should have been a grounding electrode in the initial installation.

As RBM wrote, the practice with a 3 wire feeder was to bond the neutral and ground at the garage. As greg wrote, starting the 2008 NEC 3 wire feeders are not allowed for new wiring.

A lightning strike to the garage requires lightning rods for protection.
A lightning strike coming from the house (from the service wires) on the feeder may result in the feeder wires at very different potential than the earth at the garage. Ground rods wouldn't help equalize the potential much. Bonding to the mesh/rebar in the floor at installation time would be nice. A suppressor at the feeder panel in the garage would help protect equipment in the garage.
--
bud--

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It is not allowed, and for some time, to re-bond the grounded conductor unless a "new" service is established. At no time is it allowed for the grounding conductor to carry current. Period, end of damned story.

Correct. The electrical grounding of the system is its "own" system. Lightning protection is a separate system with strange results.
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MIB wrote:

Three electricians and an inspector have said the neutral of a 3 wire feeder to a garage would, until the 2008 NEC, be bonded to the system ground and earthing electrode in the garage.
In the current NEC, quoted in another post, this practice is explicitly grandfathered.
Period, end of damned story.
--
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MIB wrote:

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THIS GROUP IS NOT THE BEST TO POST TIS QUERY YOU CAN'T CATCH FISH IN YOUR BATHTUB BUT IF YOU GO OUT TO SEA OR A LAKE YOUR ODDS IMPROVE DRAMATICALLY [;-)]
WHERE IS YOUR LIGHTNING ARRESTER ?
GO SEE THE INSPECTOR ?
YOU DO NOT WANT A POSSIBLE LIGHTNING STRIKE ON YOUR GARAGE TO TRAVEL BACK INTO THE HOUSE THAT IS REASONABLE THOUGH TRICKY
NO SAYING WHAT MAY HAPPEN TO YOUR GARAGE NO MATTER WHAT ELECTRICAL SAFETY MEASURE YOU TAKE [:-o] I'd arrest it there at the garage if I had expensive stuff in there BE SAFE ANWAYGO ALONG WITH THE LOCAL ORDINANCE SAY YOUR PRAYERS AND BE GOOD YOUR NEIGHBORS
I'LL ASK THOR NICELY TO STAY AWAY FROM YOUR HOUSE ALTOGETHER [;-)]
I AM PROTEUS
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