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UL 1030-2017 pdf free download
UL 1030-2017 pdf free download.Sheathed Heating Elements.
6.1 An insulating washer, a bushing, or the like, that is an integral part of a heating element shall be of
a matenal resistant to moisture, such as porcelain, and shall be acceptable for use at the maximum
temperatw’e to which it will be subjected under conditions of actual use. Such parts shall have adequate
mechanical strength and rigidity to withstand the stress of actual service.
6.2 Insulating material emp’oyed in an integral part of a healing element, such as a terminal block, or the like, shall be strong. not easily ignited, and resistant to moisture. A material other than porcelawi. phenobc. or one that is known to be acceptable for the support of current-carrying parts shall be investigated under conditions of actual service to determine if it has the necessary electrical and mechanical properties and will withstand the most severe conditions likely to be met in service.
6.3 The thickness of magnesium oxide (MgO) or other similar insulating material between the resistance element and the inside of the sheath, and the material of an end seal between the terminal pin and the inside of the sheath shall not be:
a) Less than 0.016 inch (0.41 mm) for elements rated 300 volts or less, and
b) Less than 0.03 1 inch (0.79 mm) for elements rated more than 300 volts, 7 SpacIngs
7,1 A spacing, through air and over surface, of not less than 1/16 inch (1.6 mm) between live parts of opposite polarity and between live parts and dead metal parts shall be maintained at or near the end of the sheath of a heating element rated 300 volts or less. For an element rated more than 300 volts, the spacings at the end of the sheath shall not be less than 1/4 inch (6.4 mm).
Exception No. 1: When exact centering of a terminal pn is required to maintain the 1/16 inch spacing, a spacing 013/64 inch (1.2 mm) in one location meets the intent of the requirement.
Exception No. 2: For an element rated 300 volts or less, a spacing not less than 3/64 inch measured between a terminal pin and the sheath is acceptable at a closed-in void. such as between an end seal and the element insulating material See Figure 7.1.
Exception No. 3: For an element rated more than 300 volts, a spacing not less than 364 inch measured between terminal pin arid sheath is acceptable when a closed-in void is riot present between an end seal and element insulation of dissimilar materials.UL 1030-2017 pdf free download.
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