Subject: Commercial Installation #1
Creation date for this scenario: February 9th, 2008
*** Please refer to the topic: "Design / Install discussions", at the Electrical Theory and Applications area, for a description of this and other scenario design / installation
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Topic of discussion:
* Commercial Electrical Installations - Existing Occupied Building, Adding Load Equipment Only - Panels, Service And Transformers Existing.
*** Scope Of Work ***
Customer wants to add:
* Three (3) 1 Horsepower 460V 3 Phase Motor Loads - indoor, non classified area,
* Two (2) 10 Horsepower 460V 3 Phase Motor Loads - indoor, non classified area,
* One (1) 25 Horsepower 460V 3 Phase Air Compressor - outdoor,
* Two (2) 2 Horsepower 208V 3 Phase Motor Loads - indoor, non classified area,
* One (1) 208V 1 Phase 6KW Load - indoor, non classified area,
* Seven (7) 120V Loads; each drawing 10 amps - indoor, non classified area,
* Ten (10) new General Purpose Receptacles.
The new indoor loads will be located no less than 150 feet from the closest available Panelboards, and at least 200 feet from the Service Equipment / Switchgear.
The Air Compressor's run is at least 300 feet from the nearest Panelboard, and over 400 feet from the Service - but is only 50 feet from where the new indoor loads are
located.
Panelboards are:
* Square D type NF (480/277) using EDB frames,
* Square D type NQOD (208/120), using QOB Bolt-On frames.
Service / Switchgear is Square D type QED, 480/277V 3 Phase 4 Wire, 800 Amps max (Service disconnect rating = 800 Amps, no GFPE).
Switchboard section has 3 available unused spaces.
Existing maximum load on service peaks out at 230 Amps non-continuously, 145 Amps continuously.
Available Fault at the Service is quoted at 30,000 Amps - and the Utility has set a 300 KVA Transformer, where this customer is the only connection to the Secondary side.
Service feeders are 4 sets of 750 MCM Aluminum. Total distance - Transformer to Service: 50 Feet.
Closest existing Panelboards and Transformer to the proposed loads data:
* 480/277V Panelboard is fed with #2 copper, protected by a 100/3 at the switchgear. Total available free spaces = 10 single pole positions (five on each side, ability to install one 3 pole + one 2 pole frame per side),
* 208/120V Panelboard is fed with #2 copper, contains an internal 100/3 main, and is fed from a 30 KVA Transformer, which the Primary side is fed from the 480/277V Panelboard above.
208/120V Panelboard is located no more than 5 feet from Transformer, and Transformer is 5 feet from 480V Panelboard.
Available fault current at the 208V Panelboard is less than 10,000 Amps.
This Panelboard has only 6 available free spaces - two on the left side, four on the right side.
Only 1 pole breakers may be installed on the left side, without altering existing circuitry. The right side may use one 3 pole + one 1 pole breaker, two 2 pole breakers, or all
four may be 1 pole breakers.
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Building Construction:
* Concrete Tilt-Up Building,
* Height to Building Ceiling: 20 feet from inside slab to roof sheathing,
* Roof Structural: Main supports = 10" x 36" Laminated beams ("Glu-Lams"), Perlins = 6" x 8" solid wooden beam members, Sub Perlins = 2" x 4" wooden members.
* Flame Spread Partitions installed at 40 foot intervals across ceiling space: 48" wide Gypsum board, supported by steel studs.
* Seismic restraints must be applied accordingly.
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Part 1: Preliminary tasks:
This customer has contacted you, and arranged to meet on site to discuss the proposed new load installations.
The customer wants you to suggest design options, and ultimately design the project as would best serve the customer's current and future needs.
You will be responsible for Engineering the proposed installations as needed, and to do the installation as well.
You are also responsible to verify if Plan Check is required, and to perform all the necessary tasks involved with Plan Check + obtaining the Permit (along with paying the necessary fees).
The customer requests a single quote for the work (you are the only bidder), and the scope of work definitions are what was agreed upon during the preliminary job walk.
This is covered in some detail within the proposal document, along with the appropriate exclusions.
You can use markups of 20% and 10%, and still get the job.
You are able to use an average labor price of $49.65, and still get the job.
Installation difficulty may be taken off as "Standard", and raceways will be typically EMT with Steel Compression fittings.
Motor and other load equipment termination (makeup) is done by you.
Coordination with equipment vendors + related trades is required.
Field crew persons must be Certified (hold General Electrician's Certification), and qualified (experienced + ability) to perform the installations on this project.
Customer has an established Safety Program, which must be observed by anyone on the premises.
Customer requested an As-Built markup plan - in CAD format, to be submitted at project completion. The customer has the most recent version of the Project's "Base Templates" (AKA "Backgrounds"), and gives to you on a CD-R.
As-Builts to be submitted as follows:
* 2 sets of Blackline Prints - on 30" x 42" Bond Media (ARCH E),
* 1 copy of the CAD files on CD-R, saved as AutoCAD 2004 version .DWG files,
* 1 copy of the AutoCAD set, saved in .PDF format (for use by people that do not have CAD)
As-Builts to contain:
* Floor Plan(s) showing new circuitry, connections and circuit numbers / panelboard names,
* Panelboard Schedules for Panels used for new circuits,
* Details of special installations or items.
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Discussion Time:
Let's get some ideas of what to propose for installations, along with all the administrative, estimation, code compliance and other task areas involved.
I will check back later to see the progress, and add some ideas.
Scott
