W-F-18140
3. REQUIREMENTS
3.1 Specification sheets. The individual item requirements shall be as specified herein and in accordance with the applicable specification sheet. In the event of any conflict between the requirements of this specification and the specification sheet, the latter shall govern.
3.1.1 Fuse ratings not listed in specification sheets. This specification is applicable to other fuse ratings, provided the desired ratings fall within the maximum and minimum current and voltage ratings specified in the applicable specification sheet. Such fuses shall be considered nonstandard items, and no Government part number will be assigned.
3.2 Qualification. Fuses furnished under this specification shall be products that are authorized by the qualifying activity for listing on the applicable qualified products list before award of contract (see 4.5 and 6.3).
3.3 Terms and definitions. The definitions of all terms used herein shall be as specified in UL 248-1, UL 248-5, UL
248-8, UL 248-9, UL 248-10, and UL 248-12.
3.4 Material. The material for each part shall be as specified herein. However, when a definite material is not specified, a material shall be used which will enable the fuses to meet the performance requirements of this specification. Acceptance or approval of any constituent material shall not be construed as a guaranty of the acceptance of the finished product.
3.4.1 Recovered materials. Unless otherwise specified herein, all equipment, material, and articles incorporated in the products covered by this specification shall be new and may be fabricated using materials produced from recovered materials to the maximum extent practicable without jeopardizing the intended use. The term "recovered materials" means materials which have been collected or recovered from solid waste and reprocessed to become source of raw materials, as opposed to virgin raw materials. None of the above shall be interpreted to mean that the use of used or rebuilt products is allowed under this specification unless otherwise specifically specified.
3.4.2 Restricted material. Flammable or explosive material, or material which can produce toxic or suffocating fumes when the fuses are in service shall not be used in construction of the fuses.
3.4.3 Enclosure. Fuses shall have a suitable enclosure which shall prevent lint and dust collecting near the fusible link and thus becoming ignited during overload and interrupting capacity rating tests.
3.4.4 Case or body. The tube shall be of hard fiber, ceramic, or melamine-impregnated glass fiber as specified
(see 3.1). Other material may be used provided the fuse is capable of meeting the requirements of 3.10.
3.4.4.1 Fiber. Fiber shall conform to grade CH, form T, of ASTM 0710.
3.4.4.2 Plastic. Unless otherwise specified (see 3.1), any plastic insulation may be used, except that cotton-base or cotton- or cellulose-filled molding material shall not be used.
3.4.4.3 Epoxy. Epoxy encapsulant compound used shall meet the performance requirements of this specification.
3.4.4.4 Adhesives. An adhesive employed in a fuse shall adequately and reliably secure together the parts that it is intended to secure (see 3.10).
3.4.4.5 Current-carrying parts (except fuse element). Current-carrying parts shall be of brass, copper, phosphor bronze, or copper alloy conforming to ASTM 836/836M, ASTM 8121/8 121M, ASTM 816/816M, ASTM 8124/8
124M, ASTM 8152/8152M, ASTM 8139/8 139M, respectively.
3.4.4.6 Noncurrent-carrying parts. All metal noncurrent-carrying parts shall be of corrosion resistant material or of material adequately protected against corrosion.
3.5 0esign and construction. Fuses shall be of the design, construction, and physical dimensions specified (see
3.1).
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