ShockMe77,
Glad my list was relevant!
Please excuse the ambiguous terms used, I will explain a few in some detail, later in this message.
Nevertheless, most of the things I listed, will be commonly dealt with in Commercial / Industrial work, which differ from what is commonly dealt with in Residential work.
The most noticeable and "Stand-Out'ish" difference between "Common" Commercial work and most Residential work is Framing Materials!
Commercial is mostly Steel Studs (all gauges - some for Drywall Partitions, others for Structural) for Interior Walls, and "building envelopes" (Structural Walls) may be Concrete Tilt-Up Panels, Masonry, Steel Panels, Steel Beam framed, and the occasional Wood-Framed Building.
When 2 floors are involved within a Tilt-Up, the Interior Framing involved may be Wood, or Structural Steel.
Nearly all Structural Roof items for Tilt-Ups are Wood (Laminated Beams, Plywood Roofing, Solid Wood Purlins).
Floors on levels above 1st floors may be of "Elastocrete" (a light weight type of Concrete) - poured on Plywood Decking, or 4" and 6" thick common concrete, poured on top of either Plywood Decking, or Corrugated Steel Decking (AKA "Robinson Decking").
Other drastic changes will be the size and capacity of Service equipment (Physical and Electrical sizes), Panelboards in remote locations, Transformers here and there, actual (hopefully!) workable Plans, and dealing with Conduits of many sizes (1/2" up to 4").
I am sure you are very aware of these differences, so I will close that chapter and move on to
"Whaddaheck Does That Mean" items of my posted list
![eek eek](/forums/images/graemlins/default/eek.gif)
*** List #"E": Rated Corridors and Ceilings ***
*** Reply: Like plenum rated ceilings? ***
Actually I was referring to Fire Rated Corridors, Walls and Ceilings + Demising Walls; but Plenum Ratings for Cable jackets used in Plenum return air ceilings is also relevant!
*** List #"G": Large Service Equipment ***
*** Reply: I can identify a closed delta from an open delta, and know the difference between a delta and wye configuration. Delta transformers are wired in series, wye's in parallel ***
This item was to refer to the physical sizes and capacities of Commercial / Industrial based Service Equipment, in addition to the various types of System Configurations one may encounter.
Keep in mind that 4 Wire Deltas (the ones with the "High Leg), may be derived from "Open Delta Vee" and Closed Delta configurations; and 3 Phase 3 Wire Deltas may also be Open Vee types or Closed types - and come in both Grounded and Ungrounded flavors!.
*** List #H: Troffer type Fluorescent Lighting Fixtures ***
*** Reply: Not sure what a "troffer type" fluorescent is but I'll guess it's either a high-bay type or a reflective lens type ***
This is a "Fancy" term for "2x2" and "2x4" Fluorescent Fixtures.
*** List #I: Complete Plansets!!! (how to read and install per "A", "M", "E", "P" and "S" Sheets) ***
*** Reply: What is A, M, E, P, & S abbreviated for? I am somewhat ok with reading prints, but not perfect ***
Sorry for the initials!
"A" = Architectural Sheets,
"M" = Mechanical Sheets (HVAC and similar),
"E" = Electrical Sheets (used and referred to 90% of the time),
"P" = Plumbing Sheets,
"S" = Structural Sheets.
There are others, which are the "Vendor-Specific" Plans, and "Specific Systems / Equipment" Plans.
*** List #J: RFIs ***
Acronym for "Request For Information" - a document / set of documents sent to Design Staff (Architects, Engineers, etc.) and/or to Contractors, to find out what the heck is needed - due to an unclear or missing piece of information on the Plans.
RFIs are generally written up, with a brief description of the issue and references to Plan Page(s).
Also known as a "WTF" (What The Foooo..)
![wink wink](/forums/images/graemlins/default/wink.gif)
Other similar documents are RFC (Request For Clarification), Change Order requests, FWO (Field Work Orders) and the lovely "Walk Through Punch Lists"!
*** List #X: Fault Levels exceeding 10KA, ***
This is where you will begin to see OCPDs with AIC / AIR listings at 18KA, 22KA, 30KA, 42KA, 65KA, 100KA and 200KA - and when + where to use them.
Also, keep a clean change of Pants + Underwear handy - these will be needed when you experience your first accidental Ground Fault on a High capacity System!
One other item - which goes in conjunction with "Service Equipment" is GFPE Protected Main Disconnects.
Ground faulting on the Load side of 480Y/277V 3 Phase 4 Wire Solidly Grounded Wye Systems of 1,000 Amps and larger, will result in tripping the _MAIN SERVICE DISCONNECT_
When this happens, it brings down the entire Building on that service.
Indications of tripping a GFPE main are:
* Only Emergency Lighting is on,
* Kwh Meter at the Main Service is not spinning / recording any consumption,
* Pissed-Off Tenants wandering around, looking for someone to point fingers at,
* A distant sound of the Back-Up Generator starting.
*** List #Z: PLC and similar type control equipment ***
Not too much PLC stuff (would be nice, but only if you want the knowledge), but more in the lines of "EMC" / "BAS" Equipment.
"EMC" = Energy Management Controllers (AKA Energy Management Systems - or "EMS") consist of Programmable type Controllers driving Relays and Contactors, which control Lighting and HVAC Equipment.
"BAS" = Building Automation Systems, which are similar to an "EMC", but may be more Integrated / sophisticated, or involving more than just Lighting and HVAC Systems for a given Client.
Both types may be comprised of "Simple" Programmable Time Switches (Electronic types, Astronomical, 7 day, multi events, programmable),
or be "LON-Based" Programmable (Local Operational Network Based - like Ethernet LANs, only the data in packets is simply Control information, sent to/from assigned addresses).
These Systems are very interesting, and may be extremely detailed.
A basic knowledge of these systems - and any Addressable Systems or Specific Systems (BAS, COMM/DATA, Fire Alarms, Security / CCTV) is something to think about gaining over time - as it will be very helpful to know what is involved in these types of systems.
Good luck!!!
Feel free to ask more questions!