Re: Power updates to civil drawings (fwd from Yasky)

[Elton Smith <elton@jlab.org>]

Hall D Electronics:


---------- Forwarded message ----------
Date: Wed, 30 May 2007 11:53:15 -0400
From: Rebecca Yasky <ryasky@jlab.org>
To: Elton Smith <elton@jlab.org>
Cc: powersp@jlab.org, Elke Aschenauer <elke@jlab.org>,
     halld-electronics@jlab.org, beaufait@jlab.org
Subject: Re: Power updates to civil drawings

Elton,
For the Gas Shed, we had previously given the A-E an equipment
requirement of 200 amps at 480 volts.  Based on discussions with Paul
Powers, the requirement will be changed to 50 kVA.

For the conduit in the Hall D floor slab from Panel CH-L2, I need the
approximate locations of the secondary transformers and the size of the
conduit you want between Panel CH-L2 and each secondary transformer.

All other items, direction will be provided to the A-E.

Thanks,
Rebecca

Elton Smith wrote:
> Hi Rebecca,
>
> Below are comments to the civil drawings regarding the Hall D clean power,
> specifically regarding clean power in the counting house. I have not
> received confirmation from Paul Powers on this list, but we were in
> general agreement at a meeting that took place a couple of weeks ago.
>
> Let me know if you have any questions.
>
> Cheers, Elton.
>
> --------------------------------------------------
>
> o Power labeled as 'gas shed' at 140KVA should be relabeled for the
> 'utility room' and verify that this is the correct reassignment
>
> o Main transformer at 1500 KVA needs to be updated to 2000 KVA (Paul)
>
> o Hall D envelop of 200 KVA power needs to be added to totals in Paul's
> list
>
> o Counting house: Attached is a file with a breakdowm from Chris
> - computer racks (assign which ones go on UPS)
> - electronic racks (none)
>
> From Joe Beaufait:
>
> o Update clean power service to Hall D (p. EP601) from 400 to 600 A with a
> shunt trip main installed, connected to the fire detection system and a
> crash button located near the main exit door in the counting house, in
> order to bring the hall into compliance with safety practice here at the
> lab.
>
> Additional notes:
> Along with the change to a 600 Amp shunt trip breaker, it is necessary
> to change T5 to a 500kva transformer. Panel CH-L2, which is currently a
> standard circuit panel full of 20 amp breakers, needs to be changed to a
> GE spectra or equivalent distribution panel. The breakers pre-installed
> in the distribution panel need to be:
> 2 ea 60 amp
> 1 ea 100 amp
> 3 ea 150 amp
>
> These correspond to the four platform clean power transformers and two
> spares. The 150 amp spares make sure that two 225 amp frames are
> installed at the manufacturer. These frames can accept plug-ins that
> will adjust their value as required in the future, for any expansion.
> They are less than 500$ installed at the time of order but over 1800$ if
> ordered after the fact.  These are all the required civil installation
> changes. I would suggest that we also include conduit from the spectra
> panel, under the floor to the projected secondary transformer locations.
> The cost is minimal during the civil construction and will speed
> installation as well as relieve congestion along the overhead cable-way.
> ----------------
>
>
> Elton Smith
> Jefferson Lab MS 12H5
> 12000 Jefferson Ave
> Suite # 16
> Newport News, VA 23606
> elton@jlab.org
> (757) 269-7625