[sudo-discuss] Electrical stages proposed

[Jake]

I agree except that i think the overhead power should happen before the 
robot service.

The robot can be disconnected during the fire inspection if we don't have 
its run done yet.  Anyway I think the overhead power will be the most 
time-consuming, and i don't even know yet how it's supposed to be done.

As for robot power requirements, yes a 30-amp double-breaker (like the one 
it's connected to now) will be fine.  It should get red and black wires 
for the 240v, and a white wire for neutral and a green wire for ground.

we can worry about other needs later, for now we just need to eliminate 
use of extension cords.

It's true that almost none of the breakers in the balcony box are 
connected to anything.  So we can just use those breakers, plus we can get 
more from Urban Ore for cheap.

* do not confuse 240v double-breakers with "duplex breakers" which give 
twice the circuits in the same space, but are not usable for 240v circuits
http://www.homedepot.com/p/Eaton-15-Amp-1-in-Duplex-Double-Pole-Type-BR-Replacement-Circuit-Breaker-BR1515/100121768

thanks so much for doing this Whitney!  please let me know when I should 
bring Fish Tape and the sawzall.

-jake

On Tue, 19 Aug 2014, Whitney Lawrence wrote:

> Upon further consideration and based on input from our community I recommend we move forward in Stages.
> 
> First Stage: Service the server area (dedicated 20A breaker), 3d print area and Museum with another 20A breaker. Thus satisfying the Fire inspection
> needs.
> 
> Stage 2, phase 1: Install plugs along Eastern wall (3rd 20A breaker)
> 
> Stage 2, phase 2: Install 240V service to Robot on Eastern wall. Other 240v needs?
> 
> Stage 2, phase 3: Install overhead power (either using the 4th available position of the Balcony breaker or tying into the 3d printer/museum j-box)
> 
> I need to know about the Robot power requirements. I looked through the manuals posted by Jake and have not found the amperage rating for the control
> box+robot. Im working under the assumption that she requires a 30A dedicated 240V supply and Jake will preform 3phase magicianary. 
> The reason I ask is because I need to size the breaker accordingly, and we have limited real estate within the Balcony panel (located in the music room).
> Currently (no pun intended) there are 4 breaker positions available in the Balcony panel. I think that all 240V supply, be it 30A(robot?) or 50A(welder?)
> any exhaust fans, dust collection service or whatever will have to be supplied from, not the Balcony panel, but the sub that feeds the Balcony called
> "Above Stage" panel. 
> 
> I recommend having dedicated breakers for the 240V supplies. Unless we know exactly what will be powered, there is no way of passing the <50% amperage
> usage per plug requirement of the NEC. This is simply the best practice. Furthermore, this should not be an issue if we are using the "Above Stage" panel
> because according to notes on the panel, most breakers within are not being utilized- so there is plenty of space. 
> 
> I'll continue to draft the drawings based on what I have written here. Hopefully the package will be complete and ready for review by this Friday. 
> 
> https://docs.google.com/spreadsheets/d/1Fgw5himtlmemiXReP-fG6rP-I2RoXsSP_MAZxcNUUm0/edit#gid=1250155659
> 
> Thanks,
> Whit
> 
>