[250.98]. Make them electrically
[250.100(D)]. Size it per Table 250.122.
[250.100(E)]. It can be in either location.
What's critical is it's limited to 6 ft in length if outside. If
it's inside, it must comply with 250.119 and 250.148.
[250.104]. It has to be bonded. The bonding
requirements are fairly lengthy, so read them carefully. Don't
assume that the water pipe is bonded or grounded. Many people have
been killed due to making this assumption.
[250.106]. You connect them. That is, you bond
them. The last thing you want is a flashover from the lightning
protection system to something metallic in your building electrical
system. You'll find further details in NFPA 780, Standard for the
Installation of Lightning Protection Systems and in the
Lightning Protection Institute's LPI-175, Standard Practice for
the Design - Installation - Inspection of Lightning Protection