New requirements in the 2005 NEC® for a marked short-circuit current rating on industrial control panels, industrial machinery, and commercial/industrial HVAC equipment have resulted in considerable attention being placed upon the proper selection and application of power distribution blocks (PDBs) and terminal blocks. It is fairly well understood that if an assembly short-circuit current rating above 10,000 amperes is desired, a power distribution block or a terminal block with a high short-circuit current rating must be utilized. However, there is confusion concerning the spacing requirements of these devices. This paper focuses on proper applications, based upon these spacing requirements. . .click here to read complete white paper. Or right-click on the link to download file (411 kb).
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