Help with Design please!

[eclipse7120]

Ok, I have an interesting project and need some help with the design. What I have is a shower building and 4 what are being called "treehouses" which are basically open air cabins on stilts. These are all seperate buildings on one site using the same electrical service. My idea is to use a 320amp meter socket which feeds both a 100 amp outdoor panel and a 225 enclosed breaker all mounted on a pedestal. The 225amp enclosed breaker will feed an electrical panel in the shower bulding ( I need this because there are large instantaneous electric water heaters) and the 100amp outdoor panel will feed the treehouses. My question is this, can I mount a panel in the shower building (it is basically one big bathroom, no seperate rooms) and does it have to be a main breaker since it is a seperate building even though it is being fed from the enclosed breaker? And also do I have to have a disconnect means at each treehouse even though they are being fed by only a single 20 amp circuit? Any help would be appreciated, thanks!

 

[charlie b]

Every separate structure has to have a disconnecting means. Reference 225.31. However, it may be possible to take credit for the 225 amp enclosed breaker as the disconnecting means for the shower building. It may also be possible to take credit for the 20 amp breakers in the 100 amp panel as being the disconnecting means for the treehouses. What matters is the notion of the disconnecting means being readily accessible, and also being "nearest the point of the conductors." Reference 225.32.

If your pedestal is out of sight or is too far away, the AHJ is likely to require an additional disconnect for each building. For my part, I would use an MCB panel, not an MLO, for the shower room, and put an enclosed non-fused disconnect at each treehouse.