PART 20—ELECTRIC MINE LAMPS OTHER THAN STANDARD CAP LAMPS Authority: 30 U.S.C. 957, 961. Source: Schedule 10C, May 17, 1938, as amended at 5 FR 3467, Aug. 30, 1940, unless otherwise noted. § 20.0 Compliance with the requirements necessary for obtaining approval. To receive approval of MSHA for any electric mine lamps other than standard cap lamps a manufacturer must comply with the requirements specified in this part. § 20.1 Purpose. (a) The purpose of the investigations made under this part is to aid in the development and use of electric lamps, other than standard cap lamps, that may be used in mines, especially in mines that may contain dangerous proportions of methane. (b) This part supersedes Schedule 10B, issued under date of June 1, 1932, and Schedule 11A, issued under date of January 13, 1936, and goes into effect May 17, 1938. (c)(1) Electric lamps and flashlights that meet the requirements set forth in this part will be termed “permissible” by MSHA, and if actively marketed will be listed as such in publications relating to permissible equipment, in order that State mine inspection departments, compensation bureaus, mine operators, miners, and others interested in safety equipment for mines may have information in regard to electric lamps and flashlights approved by MSHA. (2) MSHA May approve electric lamps and flashlights that incorporate technology for which the requirements of this part are not applicable if MSHA determines by testing that the electric lamps or flashlights are as safe as those which meet the requirements of this part. [Sched. 10C, May 17, 1938, as amended at 5 FR 3467, Aug. 30, 1940; 54 FR 30513, July 20, 1989] § 20.2 Definitions. (a) Adequate. (b) Approval. (c) Explosion-proof compartment. (d) Permissible. [Sched. 10C, May 17, 1938, as amended by Supp. 1, 20 FR 2718, Apr. 23, 1955] § 20.3 Application procedures and requirements. (a) Before MSHA will undertake the active investigation of any lamp, the applicant shall make application by letter for an investigation of the lamp. This application shall be sent to: U.S. Department of Labor, Mine Safety and Health Administration, Approval and Certification Center, 765 Technology Drive, Triadelphia, WV 26059, together with the required drawings, one complete lamp, and instructions for its operation. Fees calculated in accordance with part 5 of this title shall be submitted in accordance with § 5.40. (b) Where the applicant for approval has used an independent laboratory under part 6 of this chapter to perform, in whole or in part, the necessary testing and evaluation for approval under this part, the applicant must provide to MSHA as part of the approval application: (1) Written evidence of the laboratory's independence and current recognition by a laboratory accrediting organization; (2) Complete technical explanation of how the product complies with each requirement in the applicable MSHA product approval requirements; (3) Identification of components or features of the product that are critical to the safety of the product; and (4) All documentation, including drawings and specifications, as submitted to the independent laboratory by the applicant and as required under this part. (c) An applicant may request testing and evaluation to non-MSHA product safety standards which have been determined by MSHA to be equivalent, under § 6.20 of this chapter, to MSHA's product approval requirements under this part. [68 FR 36420, June 17, 2003, as amended at 70 FR 46343, Aug. 9, 2005; 73 FR 52211, Sept. 9, 2008] § 20.4 [Reserved] § 20.5 Conditions governing investigations. (a) One complete lamp, with assembly and detail drawings that show the construction of the lamp and the materials of which it is made, should be submitted at the time the application for investigation is made. This material should be sent prepaid to the U.S. Department of Labor, Mine Safety and Health Administration, Approval and Certification Center, 765 Technology Drive, Triadelphia, WV 26059. (b) When the lamp has been inspected by MSHA, the applicant will be notified as to the amount of material that will be required for the test. He will also be notified of the date on which the tests will start and will be given an opportunity to witness the tests. (c) Observers at formal investigations and demonstrations. (d) Permissibility tests will not be made unless the lamp is complete and in a form that can be marketed. (e) The results of the tests shall be regarded as confidential by all present at the tests and shall not be made public in any way prior to the formal approval of the lamp by MSHA. (f) No verbal report of approval or disapproval will be made to the applicant. Approval will be made only in writing by MSHA. The applicant shall not be free to advertise the lamp as being permissible, or as having passed the tests, prior to receipt of formal notice of approval. [Sched. 10C, May 17, 1938, as amended by Supp. 1, 20 FR 2719, Apr. 23, 1955; 43 FR 12314, Mar. 24, 1978; 60 FR 35693, July 11, 1995; 73 FR 52212, Sept. 9, 2008] § 20.6 General requirements. (a) The lamps shall be durable in construction, practical in operation, and suitable for the service for which they are designed and approved. (b) The intensity of light, distribution of light, and battery capacity shall be adequate for the use for which the lamp is intended. (c) Battery terminals and leads therefrom, as well as the battery gas vents, shall be designed to minimize corrosion of the electrical contacts. (d) Bulbs and other replacement parts of the lamps shall be adequately marked as a means of identification. § 20.7 Specific requirements. Two general classes of electric lamps are recognized in these requirements, namely: Class 1, those that are self-contained and easily carried by hand, and class 2, those that may or may not be self-contained and not so readily portable as the first class. (a) Class 1. (b) Class 2. § 20.8 Class 1 lamps. (a) Protection against explosion hazards. (1) Safety device or design. (2) Safety device protection (3) Locks or seals. (4) Battery current restricted. (b) Protection against bodily hazard. (1) Spilling of electrolyte. (2) Corrosion of battery container. [Sched. 10C, May 17, 1938, as amended at 5 FR 3467, Aug. 30, 1940; 54 FR 30513, July 20, 1989] § 20.9 Class 2 lamps. (a) Safety. (2) Explosion-proof compartments will be tested while filled and surrounded with explosive mixtures of Pittsburgh natural gas 1 1 (3) Glass-enclosed parts of such compartments must be guarded and be of extra-heavy glass to withstand pick blows, and be adequately protected by shrouds or by an automatic cut-out that opens the lamp circuit if the enclosure is broken. (4) When an explosion-proof enclosure consists of two or more parts that are held together securely by bolts or some suitable means to permit assembly, the flanges comprising the joints between parts shall have surfaces with metal-to-metal contact, except enclosures requiring glass, in which case glass-to-metal joints are permitted. Gaskets, if adequate, may be used to obtain a firm seat for the glass but not elsewhere. Rubber, putty, and plaster of paris are not acceptable as material for gaskets. For enclosures having an unoccupied volume (air space) of more than 60 cubic inches the width of the joint measured along the shortest flame path from the inside to the outside of the enclosure shall not be less than 1 inch. When the unoccupied volume (air space) is less than 60 cubic inches, this path shall not be less than three-fourths inch. (b) Locks and seals lighting attachment (c) Locks or seals battery (d) Temperature of lamp. (e) Cable and connection. (2) The cable (or cord) shall be adequately protected at the battery end by a fuse in the locked battery box or housing. The cable (or cord) and the fuse shall be considered parts of the lamp, and specifications for them shall be submitted by the lamp manufacturer. (3) The method of terminating the cable (or cord) at the lamp and at the battery housing shall be adequate, but in no case shall the cable or cord be detachable. MSHA reserves the right to make minor changes in the requirements outlined in paragraphs (e) (1), (2), and (3) of this section (No. 9, class 2 lamps), as experience and service prove to be necessary in the interests of safety. § 20.10 Tests (class 1 and 2 lamps). Such tests will be made as are necessary to prove the adequacy of a lamp or any of its parts in fulfilling the purposes for which it was designed. These tests include the following: (a) Safety tests, including tests of safety devices, electrical contacts, and explosion-proof features. (b) Photometric tests. (c) Tests to demonstrate adequacy of mechanical strength. (d) Tests of nonspilling features (storage-battery lamps of class 1). (e) Temperature tests. § 20.11 Material required for MSHA records. In order that MSHA may know exactly what it has tested and approved, detailed records are kept covering each investigation. These include drawings and actual equipment, as follows: (a) Drawings. (b) Equipment. (2) If the lamp is approved, MSHA will require the manufacturer, as soon as his first manufactured lamps are available, to submit one complete lamp, with the approval plate attached, as a record of his commercial product. § 20.12 How approvals are granted. (a) All approvals are granted by official letter from MSHA. A lamp will be approved under this part only when the testing engineers judge that the lamp has met the requirements of this part and after MSHA's records concerning the lamp are complete, including manufacturer's drawings that show the lamp as it is to be made commercially. No verbal reports of MSHA's decision concerning the investigation will be given, and no informal approvals will be granted. (b) As soon as the manufacturer has received the formal approval he shall be free to advertise his lamp as permissible. [Sched. 10C, May 17, 1938, as amended by Supp. 1, 20 FR 2719, Apr. 23, 1955] § 20.13 Approval plate. The manufacturer shall attach, stamp, or mold an approval plate on the battery container or housing of each permissible lamp. The plate shall bear the emblem of the Mine Safety and Health Administration, and be inscribed as follows: “Permissible __________ Lamp. Approval No. ____________________ issued to the ____________________ Company.” When deemed necessary, an appropriate caution statement shall be added. The size, material, and position of the approval plate shall be satisfactory to MSHA. (a) Purpose of approval plate. (b) Use of approval plate. (c) Withdrawal of approval. [Sched. 10C, May 17, 1938, as amended at 5 FR 3467, Aug. 30, 1940; 43 FR 12314, Mar. 24, 1978] § 20.14 Instructions for handling future changes in lamp design. All approvals are granted with the understanding that the manufacturer will make the lamp according to the drawings submitted to MSHA, which have been considered and included in the approval. Therefore, when the manufacturer desires to make any change in the design of the lamp, the manufacturer should first obtain an extension of the original approval to cover the change. The procedure is as follows: (a)(1) The manufacturer shall write to the U.S. Department of Labor, Mine Safety and Health Administration, Approval and Certification Center, 765 Technology Drive, Triadelphia, WV 26059, requesting an extension of the original approval and describing the change or changes proposed. With this letter the manufacturer should submit a revised drawing or drawings showing the changes in detail, and one of each of the changed lamp parts. (2) Where the applicant for approval has used an independent laboratory under part 6 of this chapter to perform, in whole or in part, the necessary testing and evaluation for approval of changes to an approved product under this part, the applicant must provide to MSHA as part of the approval application: (i) Written evidence of the laboratory's independence and current recognition by a laboratory accrediting organization; (ii) Complete technical explanation of how the product complies with each requirement in the applicable MSHA product approval requirements; (iii) Identification of components or features of the product that are critical to the safety of the product; and (iv) All documentation, including drawings and specifications, as submitted to the independent laboratory by the applicant and as required by this part. (b) MSHA will consider the application and inspect the drawings and parts to determine whether it will be necessary to make any tests. (c) If no tests are necessary, the applicant will be advised of the acceptance or rejection of the proposed change by letter from MSHA. (d) If tests are judged necessary, the applicant will be advised of the material that will be required. [Sched. 10C, May 17, 1938, as amended by Supp. 1, 20 FR 2719, Apr. 23, 1955; 43 FR 12314, Mar. 24, 1978; 52 FR 17514, May 8, 1987; 60 FR 35693, July 11, 1995; 68 FR 36420, June 17, 2003; 73 FR 52212, Sept. 9, 2008]