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1. Live parts and dead metal parts insulated from each other by basicinsulation.ClassⅠ1200V ClassⅡ1200V ClassⅢ500V
1 _4 _5 n, i3 }0 n: S2. Accessible dead metal parts or, for a tool with an outer enclosure of insulating material,3 F) ]; f$ | A6 n" g' j
metal foil wrapped tightly around the enclosure and inaccessible metal parts including metal foil in contact with the insulating barriers provided for spacings involving supplementary or
/ m8 ]7 X3 h. w, d; G6 c6 Ureinforced insulation. ClassⅡ1500 ' |" U4 M1 c- V* O. K* X
3. Live parts and accessible dead metal parts or, for a tool with an outer enclosure of insulating material, metal foil wrapped tightly around the enclosure. ClassⅡ3000
+ C' Z, t0 S/ | v/ V3 UNote A: If necessary because of the inaccessibility of parts, test in accordance with items 1 and 2 may be conducted on sub-assemblies of the tool, and, in this case, the test indicated in item 3 is to be conducted. If the tests in accordance with item 1 and 2 are conducted on the completely assembled tool, the tests indicated in item 3 may be omitted if there is no reinforced insulation. N6 x# e5 @% ?# r- m% j3 c# O
Note B: Those parts of the tests described in items 2 and 3 that include application of metal foil to outer enclosures of insulating material may be waived if the manufacturer has an acceptable quality control program. This program is to determine that the insulating material in question is free from cracks and metal inclusions, and that it has the physical and electrical strength required for the application. To determine that the material is free of cracks or metal inclusions, a 100 percent visual inspection is required. Periodic physical-property tests on molded parts shall also be conducted.
^. x5 {" p/ B7 w4 {! m: }: INote C: The test of item 3 may be waived for accessible metal parts, such as assembly screws, that are: (1) isolated by an outer enclosure of insulating material that is subject to the control program indicated in Note B and (2) are so located that they are remote from live parts and from inaccessible metal parts separated from live parts by basic insulation only. The remoteness is to include consideration of possible displacement of parts as the result of improper assembly. |
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