(a) Application for permit. An application for a permit to use experimental electric face equipment in a gassy mine or tunnel will be considered only when submitted by the user of the equipment. The user shall submit a written application to the Assistant Secretary of Labor for Mine Safety and Health, 1100 Wilson Blvd., Room 2322, Arlington, Virginia 22209-3939, and send a copy to the U.S. Department of Labor, Mine Safety and Health Administration, Approval and Certification Center, 765 Technology Drive, Triadelphia, WV 26059.
(b) Requirements--(1) Constructional. (i) Experimental equipment shall be so constructed that it will not constitute a fire or explosion hazard.
(1) Constructional. (i) Experimental equipment shall be so constructed that it will not constitute a fire or explosion hazard.
(i) Experimental equipment shall be so constructed that it will not constitute a fire or explosion hazard.
(ii) Enclosures designed as explosion-proof, unless already certified, or components of previously approved (permissible) machines, shall be submitted to MSHA for inspection and test and shall meet the applicable design requirements of subpart B of this part. Components designed as intrinsically safe also shall be submitted to MSHA for investigation.
(iii) MSHA may, at its discretion, waive the requirements for detailed drawings of component parts, inspections, and tests provided satisfactory evidence is submitted that an enclosure has been certified, or otherwise accepted by a reputable testing agency whose standards are substantially equivalent to those set forth in subpart B of this part.
(2) Specifications. The specifications for experimental equipment shall include a layout drawing (see Figure 1 in Appendix II) or photograph(s) with the components, including overcurrent-protective device(s) with setting(s) identified thereon or separately; a wiring diagram; and descriptive material necessary to insure safe operation of the equipment. Drawings already filed with MSHA need not be duplicated by the applicant, but shall be properly identified.
(c) Final inspection. Unless equipment is delivered to MSHA for investigation, the applicant shall notify the U.S. Department of Labor, Mine Safety and Health Administration, Approval and Certification Center, 765 Technology Drive, Triadelphia, WV 26059, when and where the experimental equipment will be ready for inspection by a representative of MSHA before installing it on a trial basis. Such inspection shall be completed before a permit will be issued.
(d) Issuance of permit. When the inspection discloses full compliance with the applicable requirements of this subpart, the Assistant Secretary will issue a permit sanctioning the operation of a single unit in a gassy mine or tunnel, as designated in the application. If the applicant is not the assembler of the equipment, a copy of the permit also may be sent to the assembler.
(e) Duration of permit. A permit will be effective for a period of 6 months. For a valid reason, to be stated in a written application, the Administrator of MSHA may grant an extension of a permit for an additional period, not exceeding 6 months. Further extension will be granted only where, after investigation, the Assistant Secretary finds that for reasons beyond the control of the user, it has not been possible to complete the experiment within the period covered by the extended permit.
(f) Permit label. With the notification granting a permit, the applicant will receive a photographic copy of a permit label bearing the following:
(1) Emblem of the Mine Safety and Health Administration.
(2) Permit number.
(3) Expiration date of the permit.
(4) Name of machine.
(5) Name of the user and mine or tunnel. The applicant shall attach the photographic copy of the permit label, or replica thereof, to the experimental equipment. If a photograph is used, a clear plastic covering shall be provided for it.
(g) Withdrawal of permit. The Assistant Secretary may rescind, for cause, any permit granted under this subpart. [33 FR 4660, Mar. 19, 1968, as amended at 43 FR 12314, Mar. 24, 1978; 52 FR 17514, May 8, 1987; 60 FR 35693, July 11, 1995; 67 FR 38384, June 4, 2002; 73 FR 52211, Sept. 9, 2008]
Sec. Appendix I to Subpart D of Part 18
LIST OF TABLES------------------------------------------------------------------------
Table
No. Title------------------------------------------------------------------------
1 Portable power cable ampacities--600 volts.
2 Portable cord ampacities--600 volts.
3 Portable power cable ampacities--601 to 5,000 volts.
4 Normal diameter of round cables with tolerances in inches--600
volts.
5 Nominal dimension of flat cables with tolerances in inches--600
volts.
6 Nominal diameter of heavy jacketed cords with tolerances in
inches--600 volts.
7 Nominal diameter of three-conductor portable power cables with
tolerances in inches--601 to 5,000 volts.
8 Fuse ratings or instantaneous settings of circuit breakers for
short-circuit protection of portable cables.
9 Specifications for portable cables longer than 500 feet.
10 High voltage trailing cable ampacities and outside diameters.------------------------------------------------------------------------
Table 1--Portable Power Cable Ampacities--600 Volts (Amperes Per Conductor Based on 60 [deg]C. Copper
Temperature--40 [deg]C. Ambient)----------------------------------------------------------------------------------------------------------------
2- 3-
Single conductor, conductor,
Conductor size--AWG or MCM conductor round or round or 4-conductor 5-conductor 6-conductor
flat flat----------------------------------------------------------------------------------------------------------------8................................. 45 40 35 30 25 206................................. 60 50 50 40 35 304................................. 85 70 65 55 45 353................................. 95 80 75 65 55 452................................. 110 95 90 75 65 551................................. 130 110 100 85 75 651/0............................... 150 130 120 100 90 802/0............................... 175 150 135 115 105 953/0............................... 205 175 155 130 120 1104/0............................... 235 200 180 150 140 130250............................... 275 220 200 160 ........... ...........300............................... 305 240 220 175 ........... ...........
350............................... 345 240 235 190 ........... ...........400............................... 375 280 250 200 ........... ...........450............................... 400 300 270 215 ........... ...........500............................... 425 320 290 230 ........... ...........----------------------------------------------------------------------------------------------------------------
Table 2--Portable Cord Ampacities--600 Volts (Amperes Per Conductor Based on 60 [deg]C. Copper Temperature--40
[deg]C. Ambient)----------------------------------------------------------------------------------------------------------------
Conductor size--AWG 1-3 conductor 4-6 conductor 7-9 conductor----------------------------------------------------------------------------------------------------------------14......................................... 15 12 812......................................... 20 16 1110......................................... 25 20 14----------------------------------------------------------------------------------------------------------------
Table 3--Portable Power Cable Ampacities--601 to 5,000 Volts (Amperes Per Conductor Based on 75 [deg]C. Copper
Temperature--40 [deg]C. Ambient)----------------------------------------------------------------------------------------------------------------
3-conductor types G-GC and SIIC-GC 3-conductor type SHD-GC 2,001-5,000
Conductor size--AWG or MCM 2,000 volts volts----------------------------------------------------------------------------------------------------------------6............................. 65 654............................. 85 853............................. 100 1002............................. 115 1151............................. 130 1301/0........................... 145 1452/0........................... 170 1703/0........................... 195 1954/0........................... 220 220250........................... 245 245300........................... 275 275350........................... 305 305----------------------------------------------------------------------------------------------------------------
Table 4--Nominal Diameters of Round Cables With Tolerances in Inches--600 Volts--------------------------------------------------------------------------------------------------------------------------------------------------------
2-conductor 3-conductor 6-conductor
------------------------------------------------------- -------------------
Type 4-conductor-- 5-conductor--
Conductor size--AWG or MCM Single Types W Type Type Type PCG, 3 Types W & G Types W & G
conductor & G PG, 2 PCG, 3 Types W PG, 3 power, 2 Type w Tolerance
twisted power power, & G power, control,
ground ground ground--------------------------------------------------------------------------------------------------------------------------------------------------------8............................. 0.44 0.81 0.84 0.94 0.91 0.93 1.03 0.99 1.07 1.18
Sec. Appendix II to Subpart D of Part 18
LIST OF FIGURES------------------------------------------------------------------------
Figure
No. Title------------------------------------------------------------------------
1 Typical layout drawing of a machine.
2 Sample bill of material (to accompany layout drawing shown on
figure 1)
3 Material to be included with the operating instructions on or
with the wiring diagram submitted to each customer.
4 Sample factory inspection form.
5 Typical plane joint.
6 Typical combination joint.
7 Typical threaded joint.
8 Typical threaded straight stuffing box and packing gland lead
entrance with provision for hose conduit.
9 Typical slip-fit straight-type and angle-type stuffing box and
packing gland lead entrance.
10 Typical slip-fit angle-type stuffing box and packing gland lead
entrance and typical plug for spare lead entrance hole.------------------------------------------------------------------------
[GRAPHIC] [TIFF OMITTED] TC22OC91.024
Figure 2--Sample Bill of Material
B. of M. No. --------
Date ------------
Revision
Date
1. ------------
2. ------------
3. ------------
4. ------------
5. ------------
Bill of Material (Electrical)
(Manufacturing Company)Model:__________________________________________________________________
(Unit Name)Approval 2G-____________________________________________________________ Motor:__________________________________________________________________
(Manufacturing Company)Frame___________________________________________________________________
------ Hp., ------ Volts, ------ Ph.,
------ Cy., ------ R.P.M.
X/P--------------------(Date).
------------(Date) Extension.Starter:________________________________________________________________
(Manufacturing Company)Model___________________________________________________________________
--------Hp., --------Volts.X/P_____________________________________________________________________
(Date)
------------ Extension.(Date)Cable--Motor to Starter:
Cond. No. ------, ------
O.D., ------[foot] LongHose--Motor to Starter Cable:
------ I.D., ------ O.D., ------ [foot] LongPortable (Trailing) Cable--Type:___________________________________________________________________
Cond. No. ------, ------
O.D., ------[foot] LongHose--for Portable Cable:
------ I.D., ------ O.D., ------[foot] LongHose Clamps--
2 for Motor-Starter Hose conduit ------ D
1 for Portable Cable Hose conduit ---- D*
*Only when short length of hose is used. Trolley Tap--
(Manufacturing Company)
Model ---------------------------- with -------ampere fuse.Rail Clamps, 2.
1 Ground Clamp, Cat. No. ------
(Manufacturing Company)
1 Return Power Conductor, Cat. No. ------
(Manufacturing Company)or--as OptionalPlug on outby end of potable cable for insertion into receptacle on distribution box or equivalent with short-circuit protective device set at ------ amperes.Static-free Belt
Model
Style
Catalog No. ------,
(Manufacturing Company)Guard for Belt--Material________________________________________________________________
Overall Dimensions ------ Long x ------
Wide x------ High
Note: The foregoing is intended as a guide. Additional electrical components used shall be completely identified. Figure 3--Material To Be Included With the Operating Instructions--on or
With the Wiring Diagram Submitted to Each Customer
(Sometimes referred to as ``Caution Statement'')
caution
To retain ``permissibility'' of this equipment the following conditions shall be satisfied:
1. General safety. Frequent inspection shall be made. All electrical parts, including the portable cable and wiring, shall be kept in a safe condition. There shall be no openings into the casings of the electrical parts. A permissible distribution box shall be used for connection to the power circuit unless connection is made in fresh intake air. To maintain the overload protection on direct-current machines, the ungrounded conductor of the portable cable shall be connected to the proper terminal. The machine frame shall be effectively grounded. The power wires shall not be used for grounding except in conjunction with diode(s) or equivalent. The operating voltage should match the voltage rating of the motor(s).
2. Servicing. Explosion-proof enclosures shall be restored to the state of original safety with respect to all flame arresting paths, lead entrances, etc., following disassembly for repair or rebuilding, whether by the owner or an independent shop.
3. Fastenings. All bolts, nuts, screws, and other means of fastening, and also threaded covers, shall be in place, properly tightened and secured.
4. Renewals and repairs. Inspections, repairs, or renewals of electrical parts shall not be made unless the portable cable is disconnected from the circuit furnishing power, and the cable shall not be connected again until all parts are properly reassembled. Special care shall be taken in making renewals or repairs. Leave no parts off. Use replacement parts exactly like those furnished by the manufacturer. When any lead entrance is disturbed, the original leads or exact duplicates thereof shall be used and stuffing boxes shall be repacked in the approved manner.
5. Cable requirements. A flame-resistant portable cable bearing a MSHA assigned identification number, adequately protected by an automatic circuit-interrupting device shall be used. Special care shall be taken in handling the cable to guard against mechanical injury and wear. Splices in portable cables shall be made in a workmanlike manner, mechanically strong, and well insulated. Not more than five temporary splices are permitted in a portable cable regardless of length. Connections and wiring to the outby end of the cable shall be in accordance with recognized standards of safety.
Figure 4--Sample Factory Inspection Form
Date ------------
Inspector ------------------------
machine Designation:____________________________________________________________Type: ------------ Serial No.___________________________________________
motor Manufacturer:___________________________________________________________Serial No.: ------ Type:________________________________________________Frame:__________________________________________________________________Hp.---- F.L. Speed:---- Volts:---- Amps.--Winding: ------ X/P No. ------ (or parts list designation).
starter Manufacturer:___________________________________________________________Serial No. ------ Type:_________________________________________________Hp. ------ Volts: ------ X/P No. ------ (or parts list designation).Short-circuit protection ------ amps.Overload-current protection ------ amps.
portable cable Manufacturer: ----------------------------------Type: ------------ Conductors: --------------Length: ------ O.D. ------ MSHA No. --------Is all wiring around machine adequately protected from mechanical damage?By hose conduit----------, Troughs______________________________________Metal tubing ----------, Other__________________________________________By removal of all sharp corners or edges?_______________________________Is wiring separated from hydraulic components?__________________________Is an adequate insulated strain clamp provided for the portable cable?__Are all packing glands properly packed so that \1/8\-inch clearance remains between packing nut and stuffing box?___________________________Are lockwashers (or equivalent) provided for all explosion-proof enclosure fastenings?___________________________________________________Are all plane joints securely fastened so that an 0.005-inch feeler gage cannot be inserted?_____________________________________________________Are all threaded covers secured?________________________________________How?____________________________________________________________________Are all electrical connections secure --------and properly insulated where necessary?________________________________________________________
Note: Add appropriate material for each explosion-proof enclosure when more than a motor and starter are on a machine. [GRAPHIC] [TIFF OMITTED] TC22OC91.014 [GRAPHIC] [TIFF OMITTED] TC22OC91.015 [GRAPHIC] [TIFF OMITTED] TC22OC91.016 [GRAPHIC] [TIFF OMITTED] TC22OC91.017 [GRAPHIC] [TIFF OMITTED] TC22OC91.018 [GRAPHIC] [TIFF OMITTED] TC22OC91.019 [33 FR 4660, Mar. 19, 1968, as amended at 42 FR 8373, Feb. 10, 1977; 42 FR 25855, May 20, 1977]