Demand Factor-For an electrical system or feeder circuit, this is a ratio of the amount of connected load (in kva or amperes) that will be operating at the same time to the total amount of connected load on the circuit.
http://elec-toolbox.com/basicdef.htm
The SCCR of the Feeder breaker if: 2. The smallest SCCR of any branch circuit protective device if : • 3. The smallest SCCR of any branch circuit on the load side of the feeder breaker, where neither #1 or #2 exist.
http://www.eaton.com/ecm/groups/public/@pub/@electrical/documents/content/1132491726860.pdf
Applying the Standard The first step is to determine the SCC of each device. This can be done by looking at the device label. If the device is not marked UL provides a table (SB4.1) of standard SCC ratings in the UL 508A guideline.
http://www.eaton.com/ecm/groups/public/@pub/@electrical/documents/content/1132491726860.pdf
The next logical step up from the branch circuit is the feeder circuit. Thus, Art. 215, which provides the requirements for sizing and installing feeders (see What's a Feeder? on page 62), follows Art. 210.
http://ecmweb.com/code-basics/article-215-feeders
Short Circuit Current Ratings z Requires marking SCCR (Short Circuit Current Rating) on industrial control panels.  To provide info for safe installation and inspection of panels based on application: i.e. available fault current to panel.
http://www.eaton.com/ecm/groups/public/@pub/@electrical/documents/content/1132491726860.pdf
Per the UL 508A guideline a power transformer rated 5kVA or lower will limit the fault to 2kA on the secondary side of the transformer (Section SB4.3).Therefore, because the rating of all of the devices on the secondary of the transformer are greater than 2kA, the SCCR of the panel in this example would be 65kA.
http://www.eaton.com/ecm/groups/public/@pub/@electrical/documents/content/1132491726860.pdf
In other words, a feeder supplies power to a branch-circuit OCPD — which, in turn, powers a branch circuit. However, you size that branch-circuit OCPD based on branch-circuit load calculations (and outlet requirements), not on feeder calculations. Because a feeder occupies this “between space” in power distribution, feeder requirements are simpler and fewer than branch requirements. Consequently, Art. 215 is much shorter than Art. 210. Article 210 also devotes extensive space to dwelling-area branch circuits.
http://ecmweb.com/code-basics/article-215-feeders
Feeder-A circuit, such as conductors in conduit or a busway run, which carries a large block of power from the service equipment to a sub-feeder panel or a branch circuit panel or to some point at which the block power is broken into smaller circuits.
http://elec-toolbox.com/basicdef.htm
Evaluate panel per UL508A, Supplement B (required by 4-06 if jurisdiction does not adopt 2005 NEC earlier).  All components in power circuit must have ratings  Ratings of starters are typically based on HP rating  Supplement SB, Table SB4.1, provides tables of components w/o marked short circuit ratings.
http://www.eaton.com/ecm/groups/public/@pub/@electrical/documents/content/1132491726860.pdf
The NEC requires the feeder grounded (neutral) conductor not to be smaller than the size listed in Table 250.122 (Table), based on the rating of the feeder OCPD.
http://ecmweb.com/code-basics/article-215-feeders
feeder circuit definition
A circuit, such as conductors in conduit or a busway run, which carries a large block of power from the service equipment to a sub-feeder panel or a branch circuit panel or to some point at which the block power is broken into smaller circuits. Feeder circuit is a circuit, such as conductors in conduit or a busway run, which carries a large block of power from the service equipment to a sub-feeder panel or a branch circuit panel or to some point at which the block power is broken into smaller circuits.