What I have seen is the whip is supplied as part of the modular furniture. It is a piece of flex with conductors in it,and you terminate it to a junction box. It is helpful to have some shop drawings so you know how many circuits the furniture is wired with. And dont forget the voice/data, this you will have to run to the workstation through wireway that is usually part of the furniture. That should also be on the shop drawings.
You will find various styles of whips used by different manufacturers. They can be 8 wire using a shared neutral or an 8 wire using an indepentant nuetral on top of that there is a 10 wire system and one system that will use 14 wires. It is best to find out right from the start which system you will be expected to connect to. Further to this there are also furniture available using a quick connect method where the just plug into a jumper which in turn connects to a distribution box. If you know who manufacturers it then I may be able to tell you how it will arrive.
What brand is the Modular Furniture? (Like Steelcase or Herman Miller).
The installers _SHOULD_ have supplied + left the Power Connection Whips when they installed the Furniture.
* If they installed it and did not leave the Whips, give them a nice and quick call, requesting that they supply these items. If they resist, begin the nasty gram assult (include the GC + the architect in the gram-o-spam).
* If the Furniture is not installed (and you are just bidding the job), contact the Vendor whom is supplying + installing the Furniture, and ask them for Wiring Configurations. Additionally, the model number / type may be referenced via the manufacturer's website.
There are so many different configurations available, and some Whips may have 2 or even 3 different connection options available.
One very important thing to keep in mind is the use of the Receptacles on the Wireway. There will be at least 4 different connection schemes for Receptacles. Suggest they stay away from any I.G. Circuitry!!!
As far as the actual connections of the Factory Whips, this is a typical scenario:
1: The Whips are commonly a 3 foot pre-made segment of 1/2" LFMC (Sealtite), with a modular connector on one end, and 12" of "free conductors" on the other.
2: The "free end" should have a 90º LFMC connector on it (if it doesn't, you will need one).
3: Set a _DEEP_ 4S box - or better yet, a deep 5S box, with a 2 gang ring, at the P.O.C. (Point Of Connection) location.
4: Drill a 1/2" K.O. in the center of a 2 gang stainless steel blank cover plate, and connect it to the sealtite fitting at the "free end".
5: Make up the splices, and cover the box with the 2 gang blank.
Techniques are similar for the Comm/Data P.O.C. location, only there are no factory Whips for Comm/Data. Dress the cables as you would at an MDF / IDF.
You need to know the Wiring system type before anything else. Number of wires + configuration. This will be reflected to your Branch Circuitry.
An example of Three (3) different wiring schemes = configurations: