Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 4 - UNDERGROUND COAL MINES › Subpart F - Electrical Equipment-General › Section 75.524 - Electric face equipment; electric equipment used in return air outby the last open crosscut; maximum level of alternating or direct electric current between frame of equipment

Current through July 13, 2024
The maximum level of alternating or direct electric current
					 that exists between the frames of any two units of electric face equipment that
					 come in contact with each other in the working places of a coal mine, or
					 between the frames of any two units of electric equipment that come in contact
					 with each other in return air outby the last open crosscut, shall not exceed
					 one ampere as determined from the voltage measured across a 0.1 ohm resistor
					 connected between the frames of such equipment.
Appendix A--List of Permissible Electric Face Equipment
					 Approved by the Bureau of Mines Prior to May 23, 1936
Motor-Driven Mine Equipment
(Approved Under Schedules 2, 2A, 2B, and 2C)
Approval No. Date
AIR COMPRESSORS
128
March 21, 1927.
128A
July 16, 1926.
COAL DRILLS AND DRILLING MACHINES
Hand Drills
109
September 19, 1922.
154
August 1, 1928.
184
February 7, 1930.
227
July 29, 1931.
254
July 15, 1933.
Post Drills
119
April 15, 1925.
119A
Do.
225
July 10, 1931.
225A
Do.
228
August 12, 1931.
228A
February 17, 1932.
230
August 20, 1931.
230A
Do.
237
December 1, 1931.
237A
Do.
Drilling Machines
147
February 8, 1928.
147A
Do.
176
September 9, 1929.
176A
Do.
LOADING AND CONVEYING EQUIPMENT LOADING MACHINES
Unmounted Type
122
January 8, 1926.
122A
Do.
Caterpillar-Mounted Type
150
May 11, 1928.
186
March 15, 1930.
222
May 8, 1931.
222A
July 28, 1931.
229
August 17, 1931.
229A
Do.
235
November 27, 1931.
235A
October 29, 1931.
278
January 17, 1935.
278A
Do.
283A
March 12, 1935.
284A
Do.
285A
Do.
294
September 18, 1935.
300A
May 6, 1936.
127
July 16, 1926.
127A
September 23, 1927.
Track-Mounted Type
194
June 6, 1930.
194A
Do.
217
February 27, 1931.
217A
Do.
276
January 11, 1935.
277
January 17, 1935.
282A
March 12, 1935.
291A
July 3, 1935.
Pit-Car Loaders
167
March 27, 1929.
167A
Do.
175
July 26, 1929.
175A
June 24, 1929.
250
December 10, 1932.
250A
Do.
252A
February 20, 1933.
CONVEYORS
Belt Type
236
November 19, 1931.
287A
March 12, 1935.
296A
January 6, 1936.
Chain Type
151
May 19, 1928.
209
December 2, 1930.
240
March 12, 1932.
240A
Do.
298A
March 3, 1936.
Power Units for Conveyors
265
February 12, 1934.
265A
March 19, 1934.
390A
March 23, 1934.
Shaker Type
247
October 21, 1932.
257A
August 11, 1933.
262A
December 8, 1933.
271
May 20, 1935.
271A
October 17, 1934.
274A
December 13, 1934.
286A
March 12, 1935.
295
September 20, 1935.
299A
April 9, 1936.
Scraper-type Loaders
138
August 5, 1927.
138A
Do.
196
September 29, 1930.
196A
July 26, 1930.
226
July 27, 1931.
255
July 31, 1933.
256
Do.
MINING MACHINES, MACHINERY-MOVING EQUIPMENT, MISCELLANEOUS
					 TRUCKS, AND WATER SPRAY SUPPLY UNITS
MINING MACHINES
Shortwall Machines
103
November 2, 1917.
103A
Do.
105
February 9, 1922.
105A
Do.
106
Do.
106A
Do.
107
Do.
107A
Do.
108
Do.
108A
Do.
111
October 16, 1922.
111A
Do.
113
November 4, 1924.
113A
Do.
114
February 7, 1925.
114A
Do.
115
Do.
115A
Do.
153
July 31, 1928.
153A
Do.
193
June 3, 1930.
193A
Do.
197
July 31, 1930.
197A
Do.
198
August 1, 1930.
198A
Do.
201
September 8, 1930.
201A
Do.
204
October 13, 1930.
204A
December 13, 1930.
223
May 13, 1931.
223A
Do.
241
March 18, 1932.
241A
Do.
258
August 15, 1933.
259A
August 16, 1933.
260A
August 17, 1933.
273
November 30, 1934.
288
March 27, 1935.
288A
Do.
292
September 11, 1935.
292A
Do.
293A
Do.
Longwall Machines
185
February 24, 1930.
185A
Do.
218
March 10, 1931.
218A
Do.
246
August 19, 1932.
246A
Do.
261
September 12, 1933.
Track or caterpillar mounted
112
March 13, 1924.
112A
Do.
118
March 12, 1925.
118A
Do.
125
April 26, 1926.
125A
Do.
172
April 30, 1929.
172A
Do.
188
April 15, 1930.
188A
Do.
207
November 14, 1930.
207A
Do.
216
February 12, 1931.
216A
Do.
231
August 31, 1931.
231A
Do.
242
April 7, 1932.
244
June 18, 1932.
244A
September 20, 1932.
253A
February 25, 1933.
267
June 27, 1934.
268A
July 25, 1934.
269A
September 24, 1934.
280A
March 4, 1935.
297
January 27, 1936.
297A
Do.
Mine Pumps
140
November 1, 1927.
140A
Do.
143
Do.
143A
Do.
144
Do.
144A
Do.
199
August 18, 1930.
199A
Do.
208
November 29, 1930.
210
December 15, 1930.
210A
Do.
211
December 17, 1930.
211A
Do.
213
December 29, 1930.
213A
Do.
214
January 2, 1931.
214A
Do.
215
Do.
215A
Do.
248
October 31, 1932.
248A
November 23, 1932.
264
January 31, 1934.
264A
Do.
272
October 23, 1934.
272A
Do.
Rock-Dusting Machines
130
November 5, 1926.
137
July 2, 1927.
146
January 20, 1928.
146 A
April 3, 1928.
180
October 30, 1929.
180A
January 17, 1930.
206
November 12, 1930.
279
February 14, 1935.
Room and Car-Spotting Hoists
116
February 13, 1925.
116A
Do.
164
January 21, 1931.
164 A
Do.
165
Do.
165A
Do.
169
April 5, 1929.
169 A
February 26, 1934.
190
April 20, 1930.
251A
January 16, 1933.
263
January 11, 1934.
266A
February 27, 1934.
STORAGE-BATTERY LOCOMOTIVES AND POWER TRUCKS (Approved
					 under Schedules 15, 2C, 2D, and 2E)
Gathering Locomotives
1501
October 11, 1921.
1502
November 13, 1922.
1503
March 24, 1923.
1505
April 5, 1924.
1507
August 20, 1925.
1508
March 21, 1925.
1509
September 25, 1925.
1511
November 10, 1925.
1512
November 11, 1925.
1513
February 25, 1926.
1516
December 28, 1926.
1517
February 10, 1927.
1520
May 27, 1929.
1521
June 13, 1930.
1522
September 12, 1930.
1523
December 19, 1930.
1525
July 25, 1934.
1526
December 20, 1935.
Tandem Locomotive
1518
November 21, 1927.
Power Trucks
1506
May 5, 1924.
1505A
June 21, 1926.
1510C
December 31, 1926.
1514
December 18, 1926.
1515
December 28, 1926.
1512C
September 13, 1928.
1519C
April 6, 1929.
1524C
June 25, 1934.
JUNCTION, DISTRIBUTION, AND SPLICE BOXES
(Approved under Schedules 2D and 2E)
Junction Boxes
400
June 16, 1928.
400A
August 5, 1925.
401
May 11, 1927.
401A
Do.
402
Do.
402A
Do.
403
April 14, 1931.
403A
Do.
405A
December 4, 1933.