Title 30: Mineral Resources
PART 18—ELECTRIC MOTOR-DRIVEN MINE EQUIPMENT AND ACCESSORIES
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Subpart D—Machines Assembled With Certified or Explosion-Proof Components, Field Modifications of Approved Machines, and Permits To Use Experimental Equipment
§ 18.80 Approval of machines assembled with certified or explosion-proof components.
(a) A machine may be a new assembly, or a machine rebuilt to perform a service that is different from the original function, or a machine converted from nonpermissible to permissible status, or a machine converted from direct- to alternating-current power or vice versa. Properly identified components that have been investigated and accepted for application on approved machines will be accepted in lieu of certified components.
(b) A single layout drawing (see Figure 1 in Appendix II) or photographs will be acceptable to identify a machine that was assembled with certified or explosion-proof components. The following information shall be furnished:
(1) Overall dimensions.
(2) Wiring diagram.
(3) List of all components (see Figure 2 in Appendix II) identifying each according to its certification number or the approval number of the machine of which the component was a part.
(4) Specifications for:
(i) Overcurrent protection of motors.
(ii) All wiring between components, including mechanical protection such as hose conduits and clamps.
(iii) Portable cable, including the type, length, outside diameter, and number and size of conductors.
(iv) Insulated strain clamp for machine end of portable cable.
(v) Short-circuit protection to be provided at outby end of portable cable.
(c) MSHA reserves the right to inspect and to retest any component(s) that had been in previous service, as it deems appropriate.
(d) When MSHA has determined that all applicable requirements of this part have been met, the applicant will be authorized to attach an approval plate to each machine that is built in strict accordance with the drawings and specifications filed with MSHA and listed with MSHA's formal approval. A design of the approval plate will accompany the notification of approval. (Refer to §§18.10 and 18.11.)
(e) Approvals are issued only by Approval and Certification Center, Box 201B Industrial Park Road, Dallas Pike, Triadelphia, W. Va. 26049.
[33 FR 4660, Mar. 19, 1968, as amended at 43 FR 12314, Mar. 24, 1978; 52 FR 17514, May 8, 1987]
§ 18.81 Field modification of approved (permissible) equipment; application for approval of modification; approval of plans for modification before modification.
(a) An owner of approved (permissible) equipment who desires to make modifications in such equipment shall apply in writing to make such modifications. The application, together with the plans of modifications, shall be filed with Approval and Certification Center, RR 1, Box 251, Industrial Park Road, Triadelphia, WV 26059.
(b) Proposed modifications shall conform with the applicable requirements of subpart B of this part, and shall not substantially alter the basic functional design that was originally approved for the equipment.
(c) Upon receipt of the application for modification, and after such examination and investigation as may be deemed necessary by MSHA, MSHA will notify the owner and the District office of the mine workers' organization having jurisdiction at the mine where such equipment is to be operated stating the modifications which are proposed to be made and MSHA's action thereon.
[33 FR 4660, Mar. 19, 1968, as amended at 43 FR 12314, Mar. 24, 1978; 60 FR 35693, July 11, 1995]
§ 18.82 Permit to use experimental electric face equipment in a gassy mine or tunnel.
(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 Approval and Certification Center, RR 1, Box 251, Industrial Park Road, Triadelphia, WV 26059.
(b) Requirements—(1) Constructional. (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 Approval and Certification Center, RR 1, Box 251, Industrial Park Road, 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]
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.------------------------------------------------------------------------
Table 1_Portable Power Cable Ampacities_600 Volts (Amperes Per Conductor Based on 60 °C. Copper Temperature_40 °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 °C. Copper Temperature_40 °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 °C. Copper Temperature_40 °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- 5- Conductor size_AWG or MCM Single Types W Type Type Type PCG, 3 conductor_Types conductor_Types conductor & G PG, 2 PCG, 3 Types W PG, 3 power, 2 W & G W & G 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 ±0 .036............................... .51 .93 .93 .98 1.01 1.03 1.18 1.10 1.21 1.31 ±. 034............................... .57 1.08 1.08 1.10 1.17 1.20 1.29 1.27 1.40 1.52 ±. 033............................... .63 1.17 1.17 1.20 1.24 1.27 1.31 1.34 1.48 1.61 ±. 032............................... .66 1.27 1.27 1.29 1.34 1.34 1.39 1.48 1.61 1.75 ±. 031............................... .74 1.44 1.44 1.44 1.51 1.52 1.52 1.68 1.88 2.05 ±. 031/0............................. .77 1.52 1.52 1.52 1.65 1.68 1.68 1.79 1.96 2.13 ±. 042/0............................. .82 1.65 1.65 1.65 1.75 1.79 1.79 1.93 2.13 2.32 ±. 043/0............................. .87 1.77 1.77 1.77 1.89 1.93 1.93 2.07 2.26 2.49 ±. 054/0............................. .93 1.92 1.92 1.92 2.04 2.13 2.13 2.26 2.46 2.71 ±. 05250............................. 1.03 2.16 2.16 2.16 2.39 2.39 2.39 2.66 ............... ....... ±. 06300............................. 1.09 2.32 ....... ....... 2.56 ....... ........ 2.84 ............... ....... ±. 06350............................. 1.15 2.43 ....... ....... 2.68 ....... ........ 2.98 ............... ....... ±. 06400............................. 1.20 2.57 ....... ....... 2.82 ....... ........ 3.14 ............... ....... ±. 06450............................. 1.26 2.67 ....... ....... 2.94 ....... ........ 3.26 ............... ....... ±. 06500............................. 1.31 2.76 ....... ....... 3.03 ....... ........ 3.40 ............... ....... ±. 06--------------------------------------------------------------------------------------------------------------------------------------------------------
Table 5_Nominal Dimensions of Flat Cables With Tolerances in Inches_600 Volts-------------------------------------------------------------------------------------------------------------------------------------------------------- 2-conductor 3-conductor_Type G ----------------------------------------------------------------------------------------------------------------------- Type W Type G Major Minor Conductor size_AWG ----------------------------------------------------------------------------------------------------------------------- Major Minor Major Minor -------------------------------------------------------------------------------- O.D. Tolerance O.D. Tolerance O.D. Tolerance O.D. Tolerance O.D. Tolerance O.D. Tolerance--------------------------------------------------------------------------------------------------------------------------------------------------------8............................... 0.84 ±0 0.51 ±0 .04 .036............................... .93 ±. .56 ±. 1.02 ±. 0.56 ±. 1.65 ±0 0.67 ±0 04 03 04 03 .06 .054............................... 1.05 ±. .61 ±. 1.15 ±. .61 ±. 1.85 ±. .75 ±. 04 03 04 03 06 053............................... 1.14 ±. .68 ±. 1.26 ±. .68 ±. 1.99 ±. .77 ±. 04 03 04 03 06 052............................... 1.24 ±. .73 ±. 1.35 ±. .73 ±. 2.10 ±. .81 ±. 04 03 04 06 06 051............................... 1.40 ±. .81 ±. 1.55 ±. .81 ±. 2.43 ±. .97 ±. 04 03 04 03 06 051/0............................. 1.51 ±. .93 ±. 1.67 ±. .93 ±. 04 03 04 032/0............................. 1.63 ±. .99 ±. 1.85 ±. .99 ±. 04 03 04 033/0............................. 1.77 ±. 1.03 ±. 2.00 ±. 1.03 ±. 04 03 04 034/0............................. 1.89 ±. 1.10 ±. 2.10 ±. 1.10 ±. 04 03 04 03--------------------------------------------------------------------------------------------------------------------------------------------------------
Table 6_Nominal Diameters of Heavy Jacketed Cords With Tolerances In Inches_600 Volts------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ 2-conductor 3-conductor 4-conductor 5-conductor 6-conductor 7-conductor Conductor size_AWG ----------------------------------------------------------------------------------------------------------------------------- Diameter Tolerance Diameter Tolerance Diameter Tolerance Diameter Tolerance Diameter Tolerance Diameter Tolerance------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------14................................................................ 0.64 ±0 0.67 ±0 0.71 ±0 0.78 ±0 0.83 ±0 0.89 ±0 .02 .02 .02 .03 .03 .0312................................................................ .68 ±. .72 ±. .76 ±. .83 ±. .89 ±. .98 ±. 02 03 03 03 03 0310................................................................ .73 ±. .80 ±. .84 ±. .90 ±. 1.00 ±. 1.07 ±. 03 03 03 03 03 03------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Table 7_Nominal Diameters of Three-Conductor Portable Power Cables With Tolerances in Inches_601 to 5,000 Volts-------------------------------------------------------------------------------------------------------------------------------------------------------- Type G-GC Type SHC-GC (shielded Type SHD-GC Type SHD-GC (nonshielded) 2,000 overall) 2,000 volts (individually (individually volts ----------------------- shielded power shielded power Conductor size_AWG or MCM ----------------------- conductors) 2,001- conductors) 3,001- 3,000 volts 5,000 volts Diameter Tolerance Diameter Tolerance --------------------------------------------- Diameter Tolerance Diameter Tolerance--------------------------------------------------------------------------------------------------------------------------------------------------------6........................................................... 1.25 +0.10, - 1.39 +0.11, - 1.62 +0.13, - 1.78 +0.14, - 0.06 0.07 0.08 0.094........................................................... 1.40 +.11, -.07 1.55 +.12, -.08 1.77 +.14, -.09 1.90 +.15, -.103........................................................... 1.48 +.12, -.07 1.62 +.13, -.08 1.84 +.15, -.09 1.98 +.16, -.102........................................................... 1.55 +.12, -.08 1.71 +.14, -.09 1.92 +.15, -.10 2.09 +.17, -.111........................................................... 1.74 +.14, -.09 1.89 +.15, -.09 2.04 +.16, -.10 2.18 +.17, -.111/0......................................................... 1.84 +.15, -.09 2.02 +.16, -.10 2.18 +.17, -.11 2.34 +.19, -.122/0......................................................... 1.99 +.16, -.10 2.16 +.17, -.11 2.29 +.18, -.12 2.46 +.20, -.123/0......................................................... 2.12 +.17, -.11 2.30 +.18, -.11 2.45 +.20, -.12 2.62 +.21, -.134/0......................................................... 2.30 +.18, -.12 2.48 +.20, -.12 2.62 +.21, -.13 2.76 +.22, -.14250......................................................... 2.46 +.20, -.12 2.70 +.22, -.13 ........ ........... ........ ...........300......................................................... 2.63 +.21, -.13 2.84 +.23, -.14 ........ ........... ........ ...........350......................................................... 2.75 +.22, -.14 2.97 +.24, -.15 ........ ........... ........ ...........--------------------------------------------------------------------------------------------------------------------------------------------------------
Table 8_Fuse Ratings or Instantaneous Setting of Circuit Breakers for Short-Circuit Protection of Portable Cables and Cords-------------------------------------------------------------------------------------------------------------------------------------------------------- Maximum allowable circuit Conductor size_AWG or MCM Ohms/1,000 ft. at 25 °C. Maximum allowable fuse breaker instantaneous rating (amperes) setting (amperes) \1\--------------------------------------------------------------------------------------------------------------------------------------------------------14............................................................ 2.62 20 5012............................................................ 1.65 30 7510............................................................ 1.04 40 1508............................................................. .654 80 2006............................................................. .410 100 3004............................................................. .259 200 5003............................................................. .205 250 6002............................................................. .162 300 8001............................................................. .129 375 1,0001/0........................................................... .102 500 1,2502/0........................................................... .081 ............................ 1,5003/0........................................................... .064 ............................ 2,0004/0........................................................... .051 ............................ 2,500250........................................................... .043 ............................ 2,500300........................................................... .036 ............................ 2,500350........................................................... .031 ............................ 2,500400........................................................... .027 ............................ 2,500450........................................................... .024 ............................ 2,500500........................................................... .022 ............................ 2,500--------------------------------------------------------------------------------------------------------------------------------------------------------\1\ Higher circuit-breaker settings may be permitted for special applications when justified.
Table 9_Specifications for Portable Cables Longer Than 500 Feet \1\-------------------------------------------------------------------------------------------------------------------------------------------------------- Normal ampacity at 60 Conductor size_AWG or MCM Max. allowable length (feet) °C. copper temperature Resistance at 60 °C. (40 °C. ambient) copper temperature (ohms)--------------------------------------------------------------------------------------------------------------------------------------------------------6............................................................. 550 50 0.5124............................................................. 600 70 .3533............................................................. 650 80 .3022............................................................. 700 95 .2581............................................................. 750 110 .2201/0........................................................... 800 130 .1852/0........................................................... 850 150 .1573/0........................................................... 900 175 .1304/0........................................................... 1,000 200 .116250........................................................... 1,000 220 .098300........................................................... 1,000 240 .082350........................................................... 1,000 260 .070400........................................................... 1,000 280 .061450........................................................... 1,000 300 .054500........................................................... 1,000 320 .050--------------------------------------------------------------------------------------------------------------------------------------------------------\1\ Fuses shall not be used for short-circuit protection of these cables. Circuit breakers shall be used with the instantaneous trip settings not to exceed the values given in Table 8.
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[33 FR 4660, Mar. 19, 1968; 33 FR 6345, Apr. 26, 1968, as amended at 42 FR 8373, Feb. 10, 1977] Appendix II to Subpart D of Part 18
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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.------------------------------------------------------------------------
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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. ___, ___&inch;
O.D., ___′ Long
Hose—Motor to Starter Cable:
___&inch; I.D., ___&inch; O.D., ___ ′ Long
Portable (Trailing) Cable— Type:____________________
Cond. No. ___, ___&inch;
O.D., ___′ Long
Hose—for Portable Cable:
___&inch; I.D., ___&inch; O.D., ___′ Long
Hose Clamps—
2 for Motor-Starter Hose conduit ___&inch; D
1 for Portable Cable Hose conduit __&inch; 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 Optional
Plug 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 ___&inch; Long × ___&inch;
Wide ×___&inch; 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.
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[33 FR 4660, Mar. 19, 1968, as amended at 42 FR 8373, Feb. 10, 1977; 42 FR 25855, May 20, 1977]
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