19 Aug
2014
19 Aug
'14
11:35 a.m.
hey whit,
I think we may as well run the 230 along with 115 over to the shop area
and leave only the overhead work until later. If we are going to use the
same conduit to run all conductors, we may as well pull the 230 along
with the 115. to touch on the limited real estate inside the breaker
box, i agree about having a dedicated breaker for the server farm. with
the other 3 slots available, you indicated that 2 would be taken up for
the 230V since we're energizing 2 hot conductors. with the remaining
slot, would it be possible to power the 3d printing area, the 'museum,'
and still put some 115V outlets on the back wall? thanks for taking the
time to do all this analysis of the code for us.
using all 3/4" conduit (instead of 1/2" and 1" as originally shown in
the spreadsheet) and purchasing one bender would make it easier in terms
of getting clips etc in bulk that could be used throughout the building
if we have leftovers.
do y'all know when the fire inspection is scheduled? the more work we
can get in under the first round the better, if for no other reason than
not feeling like we immediately need to do more electrical work after
the fire inspection. i will have alot more time to help out during the
next few weeks, and would be glad to drive on a home depot run if we're
ready to pick up supplies this weekend.
on amperage requirements, the welder that's there now uses 7 amps at 115
iirc, and for example a lincoln weldpak180HD uses 20 amps at 230. from
what i understand there is not 3-phase power coming into the building at
all, so the best course of action would be to install 2 single phase 230
plugs - one for a welder or plasma cutter or other heavy machine, and
one dedicated to the robot, with the intent to use a rotary phase
converter to provide 3-phase power.
cheers,
hol
On 2014-08-19 10:50, 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_MA…
[1]
Thanks,
Whit
Links:
------
[1]
https://docs.google.com/spreadsheets/d/1Fgw5himtlmemiXReP-fG6rP-I2RoXsSP_MA…