Page 1 - Short-Circuit-Current-Ratings

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Power Distribution Blocks with
SCCR and Feeder Spacing
Short-Circuit Current Ratings
and Feeder Spacing
SCCR Information:
The requirements of the National Electric Code (NEC) and UL508A now
require many electrical panels to carry a Short Circuit Current Rating
(SCCR). Analyzing the SCCR of individual components and overcurrent
protection devices is a method of determining the SCCR of an electrical
assembly.
Marathon’s Recognized and Listed Power Blocks been used in electrical
control panels for over 35 years. These blocks have now been tested and
approved for higher SCCR.
The higher ratings are based on proper wire sizes and the appropriate circuit protec-
tion device (fuses or circuit breakers).
UL508A does allow default SCCR for Power Distribution Blocks of 10,000A
with no additional testing.
For detailed SCCR product information, please visit www.marathonsp.com/PDFs/SCCR.pdf
Feeder Spacing/Adapter Plates for Feeder Spacing:
Recently, the National Electric Code (NEC) and UL508A began requiring that Power Blocks used in Feeder Circuits must
carry voltage spacing greater than the traditional Industrial Control requirements. Marathon offers Power Blocks solutions
that meet feeder spacing requirements.
Marathon’s
Listed
Power Distribution Blocks cover a range of small to large wire termination capabilities and meet
the requirements for use in feeder circuits per UL508A up to 600V.
We also offer a line of adapter plates for Marathon’s
Recognized
Power Blocks that allow the customer to mount
three single-line Power Blocks on a base which assures the requirements of feeder spacing are met.
Adapter Kit
Catalog #
Power Block
Series
FBA 132
FBA 133
FBA 1381
FBA 1383
FBA 141
FBA 142
FBA 143
FBA 145
132 Series
133 Series
EPB 71/74 (1 pole)
EPB 71/74 (3 pole)
141 Series
142 Series
143 Series
145 Series
POWER BLOCKS
ADAPTER
PLATE
ASSEMBLE WITH
SCREW AS
SHOWN
Datasheets available at marathonsp.com