wiring a sub panel in garage

[HayZee518]

In 1992 I was doing sub panels and the Mass inspector said 4 wires. underground in conduit four wires. overhead as in detached service drop four wire SER.

[mrcaptainbob]

Am closely following this thread. Very good dialogue. Great info. Great give and take. Thanks, guys.....very informative.

[Speedy Petey]

Glotharg, no need to close this thread. This is a good professional discussion and others may have questions.

Hazee, BBurger is completely correct in that ANY structure served by a feeder does require some form of grounding electrode. 250.32(A) is very clear on this. This section has been in place for quite some time.

buckofdurham, is also correct in that under earlier codes, and very specific circumstances, a 3-wire feeder is/was definitely allowed, and the sub-panel is/was treated like a main panel. This was found in 250.32(B) prior to the 2008 edition.