* Spacings between (1) uninsulated live parts of opposite polarity and (2) uninsulated live parts and uninsulated grounded parts other than the enclosure or exposed metal parts.
** The spacing through air and over surface between live parts and grounded metal parts including the enclosure is not less than 12.5 mm for 51-250 V and 25 mm for 251-600 V.
*** The spacing between wiring terminals of opposite polarity and the spacing between a wiring terminal and a grounded dead metal part is not less than 6.3 mm if short-circuiting or grounding of such terminals may result from projecting strands of wire.
+ These spacings are applicable to a terminal block for use only in or with industrial control equipment where the load on any single circuit of the terminal block does not exceed 15 A at 51-150 V, 10 A at 151-300 V, 5 A at 301-600 V, or the maximum amp rating, whichever is less.
++ The special components spacings for Use Group E are applicable to a terminal block for use in equipment of limited rating, as permitted by the applicable Part II Standard covering the end equipment in which the terminal block is used.