Im about to start a Gymnasium that has a
800a. 480v 3phase service and it's going to have both exterior and interior stem walls that i have to go through. In the past i've done it with the PVC conduit coupling sticking through the form but i'm wondering if it would be better if i used a larger sleeve flush with the inside of the form. If that would be the case what would be the best way to install it and seal it. Could you use a snap tie to hold it in place? Any other ideas?

Thanks in advance for your replies
Z...