My two cents --- what Ed and Bill both said.
The solid state are more accurate on ground correcting vs. the gas that are set (like a fuse) for a certain voltage. The digital sets/ports will get fried if the allowance is too high. But if you use the lower value the slp and dt pairs with standard ringing will be too much for them to accept.
Ground, ground, bond, bond, and ground again --- everything in sight. If you have a splice between the buildings, bond, bond, and bond again. The inside wiring (25 foot) acts as a "blow-out" fuse but you can order riser shielded cable if you really want to spend the money.
Grounding and BET (building entrance terminals) are not cheap but a lot cheaper than replacing a system and losing a good customer.
Again, just my two cents.
KLD
