How many grounds do I need to pull in a 2"inch conduit emt with 28 circuits in it(38 wires total),to feed 120v 20 amp receptacles and one 208v 30amp receptacle? All circuits are run with #10awg from the panel to a gutter 150 feet apart.
Looking in table 5 says that the approximate area for THHN #10 is 0.0211 x 39 =0.8229 and then in table 4 for 2" EMT over 2 wires 40% is 1.342 so is that 2" conduit the right size? or I missing something?

[This message has been edited by louigy35 (edited 11-09-2006).]

[This message has been edited by louigy35 (edited 11-11-2006).]

[This message has been edited by louigy35 (edited 11-11-2006).]