[sudo-discuss] Sudoroom electrical plans

Mon Sep 8 09:15:37 PDT 2014

On 9/7/14 10:12 AM, hol at gaskill.com wrote:

we've been thinking the desk/laptop load would be split between two big
power strips with one attached to the back wall and one running from 3d
printing area, so on 2x20A runs.  so far we haven't tripped a breaker
that i know of (have we?) and that's with the existing
tentacle-suspension bridge infrastructure.  from what i understand,
there were already $400 dollars allocated for 'phase i' which has been
circulating for a few weeks now, and whit already paid out of pocket for
the materials to match the budget, and as far as i know has not been
reimbursed :(.  with the servers getting their own dedicated runs, the
risks associated with a breaker popping in the event of an extreme load
are pretty low.  my inclination would be that unless someone shows
quantitative analysis of planned loads exceeding planned capacity (thank
you judy for crunching some loads!) then we can move forward with the
plan that's been refined over the last month.  I do not know about any
limitations like de-rating breaker positions below their rated capacity
so there could be something we're missing.

cheers

On 2014-09-07 08:54, J Clark wrote to hol:

Hol,

Just curious. If you have, say, 25 Sudoers each with a laptop/3d
printer/other power thing plugged in at the same time to, say, a several
extension cord plugs -- guessing average 75 watts each? (between Apple's
60W and 80W, guessing more would be the older), that's 1875 Watts at
once, at 110 V that's 17 amps. (I think that's right.) This is
reasonable for a 20A circuit? (Seems so, just curious to know if there
are other bits to consider.)

Thanks
  judi

On Sep 7, 2014, at 8:27 AM, hol at gaskill.com <mailto:hol at gaskill.com> wrote:
>
> i do think since CCL will be pulling from a different panel that we
> should have enough amps from 4x20 amp breaker positions.  the balcony
> is set to get its own 2 runs (with one 20A plug on each run) for the
> server farm and any amplifiers set to run there, the 3d printing area
> and museum have a breaker run, and the tool area will have its own
> breaker.  the only complication in my mind is the back set of outlets
> sharing a breaker with the tools and someone bearing down with a chop
> saw just before someone hits save on the new greatest cryptographic
> algorithm on their laptop.  that's what pushes it to 5 positions in my
> mind if it were easy to get that 5th run energized.
>
>  
>
> we do intend to run a separate 230V service later for the heavy stuff
> over 2 outlets, so maybe we could identify a spot for a breaker to be
> installed under stage 2.  
>
>  
>
> cheers
>
>  
>
>  
>
> On 2014-09-07 07:04, Dave Pedroli wrote:
>
>> Fine by me. Just my opinion that loads add up.  Indeed we use more things with small loads than ever before... I have worked on houses that get by on two fifteen amp circuits in San Francisco and I have had problems with two hundred amps 220 volts not being enough...  
>>
>>
>> Dave
>>
>>
>>
>> Sent from the surveillance van
>>> On Sep 6, 2014, at 5:31 PM, Jake <jake at spaz.org
>>> <mailto:jake at spaz.org>> wrote: I disagree. We have very few things
>>> that use more than 100 watts, and the number is diminishing
>>> constantly. a laptop takes no more than 100 watts max, typically
>>> around 50. 60 watt lightbulbs are occasionally used, but more often
>>> we use 24 watt CFLs, when we're not simply using the overhead
>>> lights. Desktop computers with their monitors take a total of less
>>> than 200. 3d printers take between 50 and 100 watts depending on how
>>> much heating is needed. A heat gun can take 1500 watts, but a 20-amp
>>> breaker can supply over 2400 watts. Without a more detailed list of
>>> what people expect to plug in, we can't be sure one way or another
>>> whether there will be conflicts requiring something to be plugged
>>> into a different outlet. But my experience tells me that what we
>>> have sketched out so far is more than enough. and we know for a fact
>>> that increasing service will correspondingly increase costs and time
>>> to completion, and complexity if we run out of circuit breakers
>>> overestimating our needs. Worst case is that you have to plug the
>>> second autoclave into a different outlet than the first one. -jake
>>>> On Sat, 6 Sep 2014, Dave Pedroli wrote: Hi all, Going over your
>>>> emails and PDFs it looks good however putting more than a couple
>>>> outlets on a breaker will end up being problematic. Yes
>>>> refrigerators are smaller loads but there will be a time when
>>>> someone opens all one after the other and they try to start all at
>>>> once blowing a breaker and defrosting... Autoclaves typically need
>>>> their own circuit etc ... 13 outlets with 4 breakers is pushing it.
>>>> If the majority of use was to be laptops and soldering irons ok but
>>>> the minute a heat gun is plugged in poof, you blow a breaker. With
>>>> electricity and parachutes it's best to start out right rather than
>>>> build up to it. I'll go over the PDFs on my iPad later and let you
>>>> know what I think. The layout looks fine, the number of outlets
>>>> looks good it's just the the number of circuits (breakets) that
>>>> needs improving. Dave Somewhere on the bonneville salt flats Sent
>>>> from the surveillance van
>>>>> On Sep 5, 2014, at 3:58 PM, Jake <jake at spaz.org
>>>>> <mailto:jake at spaz.org>> wrote: I believe the electrical panel in
>>>>> the balcony only supplies one or two things (not including the
>>>>> robot, which is a temporary connection) I think we should look
>>>>> into simply moving that breaker box down ten feet so it faces the
>>>>> server room, and be done with it.
>>>>>> On Fri, 5 Sep 2014, Whitney Lawrence wrote: Howdy,Let me begin
>>>>>> with thanking you for looking at the proposal. Your
>>>>>> interpretation of the plans is correct.{ Main -> above stage
>>>>>> panel -> balcony panel } is how the proposed plan is drawn. There
>>>>>> is enough room in the balcony panel (which is the one located in
>>>>>> the small room that shares a wall with the server loft of
>>>>>> sudoroom) to accomplish phase 1 of the proposal. The proposal is
>>>>>> based on instruction received to minimize cost. Ideally, there
>>>>>> would be a main panel breaker that supplies a sub panel for all
>>>>>> of sudo's needs (phase 1 and phase 2). I can't accurately guess
>>>>>> at a cost number for this type of installation. Figure a 100amp
>>>>>> sub with hundreds of feet of 2awg plus breaker box plus breakers
>>>>>> plus conduit plus hardware. All depending on if the main service
>>>>>> can even handle the additional power demands (hiring an
>>>>>> electrician to run the calcs). Ballpark $3-5k maybe- but its
>>>>>> really a shot in the dark? My experience with this type of thing
>>>>>> is there is always a better way to do it, if you go the money. A
>>>>>> middle road is to plan on having the future sudo-sub panel placed
>>>>>> near the balcony panel. Build in an extra 5ft or so of wire for
>>>>>> the future transition into the new sudo-sub panel. All that would
>>>>>> be needed is to remove the breakers from the old box re-run wire
>>>>>> from J-box 1 to the new sudo-sub, as well as re-routing the 240V
>>>>>> lines from the above stage panel to the sudo-sub (and of course
>>>>>> preform all the main -> suod-sub work). as far as existing vs
>>>>>> proposed. only the sub panels mentioned above exist currently-
>>>>>> I'll make a note to call out the existing stuff in the drawings.
>>>>>> Thanks, Whit On Fri, Sep 5, 2014 at 11:42 AM, Cere Mona Davis
>>>>>> <ceremona at gmail.com <mailto:ceremona at gmail.com>> wrote: Hi
>>>>>> everyone. It's the first time I have looked at these plans and I
>>>>>> have some questions and thoughts. Dave said he won't be able to
>>>>>> respond to this email until a couple of days as he is out in the
>>>>>> boonies somewhere. So I am writing in to expedite some issues
>>>>>> that I think he will likely bring up in the days ahead. Whit,
>>>>>> thanks for drawing up these plans! For someone who is not
>>>>>> intimately familiar with our electrical layout the plans might
>>>>>> need a more clear description of existing electrical vs. proposed
>>>>>> new electrical, however. In multiple conversations with Dave (and
>>>>>> one on-site visit) he has mentioned repeatedly that we will want
>>>>>> to shoot for putting in another sub panel for the sudoroom off of
>>>>>> the main panel as the end-game; rather than daisy-chaining off of
>>>>>> an existing panel (the balcony) as what seems to be proposed
>>>>>> here. If we can't immediately put in a sub panel into the room,
>>>>>> due to cost, we should at-least be planning for conduit and
>>>>>> wiring paths, etc that allows for a sudoroom sub-panel in the
>>>>>> future. Thoughts? -Cere On Fri, Sep 5, 2014 at 10:23 AM,
>>>>>> <hol at gaskill.com <mailto:hol at gaskill.com>> wrote: Thanks Yar!
>>>>>> Whit can you liaise w/ Dave RE how much of the work is going to
>>>>>> be done under the first permit? Cheers, Hol On 2014-09-04 23:16,
>>>>>> yar wrote: Hi all, Dave Pedroli is a certified electrician who's
>>>>>> offered to review our plans to give them an okay. I'm copying him
>>>>>> and the people who've been most involved with electrical work.
>>>>>> Dave, the latest plans are attached, and also available online[1
>>>>>> <https://lists.sudoroom.org/pipermail/sudo-discuss/2014-August/007369.html>].
>>>>>> Could you please look them over and write us a few
>>>>>> formal-sounding sentences that boil down to "hello I am a real
>>>>>> electrician and I say these plans are solid"? This will help us
>>>>>> make the landlord happy so he will let us do them. Thank you!!
>>>>>> [1]
>>>>>> https://lists.sudoroom.org/pipermail/sudo-discuss/2014-August/007369.html
>>>>>> -- Best Regards, Cere Davis ceremona at gmail.com
>>>>>> <mailto:ceremona at gmail.com> ------------------- GPG Key:
>>>>>> http://taffy.findpage.com/~cere/pubkey.asc
>>>>>> <http://taffy.findpage.com/%7Ecere/pubkey.asc> GPG fingerprint
>>>>>> (ID# 73FCA9E6) : F5C7 627B ECBE C735 117B 2278 9A95 4C88 73FC A9E6
>
>
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