yes you need a myers hub for the same above the bottom 1/3 and into the top for
your non-metalic enclousure. some will use a water tight connector (raintight
with a gasket ring). Either way you need a bonding bushing on your connector or
a myers hub with the bonding screw on the inside locknut to bond together all
the conduits coming into the enclosure.
i would suggest a hole saw definitely if you are working with fiberglass
combiner box and also for a pvc box because a unibit makes a cloud you dont
want around you in fiberglass and makes a beveled hole in a pvc box that can
make a seal difficult if your not careful.
nick
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