On December 4, 1996, a petition was filed seeking a modification of the application of 30 CFR 75.901(a) to Petitioner's Mine No. 1, located in Pike County, Kentucky. The Petitioner alleges that the alternative method outlined in the petition will at all times guarantee no less than the same measure of protection afforded the standard.
MSHA personnel conducted an investigation of the petition and filed a report of their findings and recommendations with the Administrator for Coal Mine Safety and Health. After a careful review of the entire record, including the petition and MSHA's investigative report and recommendations, this Proposed Decision and Order is issued.
The alternative method proposed by the Petitioner (as amended by the recommendations of MSHA) will at all times guarantee no less than the same measure of protection afforded the miners under 30 CFR 75.901(a).
On the basis of the petition and the findings of MSHA's investigation, Dry Fork Energy, Incorporated is granted a modification of the application of 30 CFR 75.901(a) to its Mine No. 1.
Wherefore, pursuant to the authority delegated by the Secretary of Labor to the Administrator for Coal Mine Safety and Health, and pursuant to Section 101(c), of the Federal Mine Safety and Health Act of 1977, 30 U.S.C., sec. 811(c), it is ordered that Dry Fork Energy, Incorporated’s Petition for Modification of the application of 30 CFR 75.901(a) in its Mine No. 1 is hereby:
GRANTED, for the 480-volt, three-phase, 150 KW/187.5 KVA diesel powered generator set, conditioned upon compliance with the following terms and conditions:
1. The 150 KW/187.5 KVA, 480-volt, diesel powered generator set shall only be used to move equipment in and out of the mine listed in the body of this petition.
2. The neutral of the secondary side of the wye configured 480/575/995-volt transformer shall have in series between it and the frame of the generator unit, a 995-volt rated resistor that will limit phase-to-frame fault current to 0.5 ampere continuously.
3. The 480-volt output of the generator shall be equipped with a sensitive ground fault relay set to cause the circuit breaker that supplies power to the primary of the 480-volt transformer to trip and shut down the diesel engine when a phase-to-frame fault of not more than 90 milliamperes occurs.
4. The secondary transformer 480-volt, 575-volt and 995-volt circuits shall each be equipped with a sensitive ground fault relay that will cause their respective circuit breaker to trip and shut down the diesel engine when a phase-to-frame fault of not more than 90 milliamperes occurs.
5. The 995-volt circuit breaker shall be provided with a means to provide short-circuit, overcurrent, grounded-phase, undervoltage and ground monitoring protection. The instantaneous unit for the 995-volt circuit breaker shall be adjusted to trip at the settings specified below when the following cable sizes are connected between the 995-volt circuit breaker and the piece of equipment being moved:
a. No. 4/0 cable, not to exceed 1,000 feet in length, circuit breaker setting not to exceed 600 amperes.
b. No. 3/0 cable, not to exceed 900 feet in length, circuit breaker setting not to exceed 600 amperes.
c. No. 2/0 cable, not to exceed 850 feet in length, circuit breaker setting not to exceed 600 amperes.
d. No. 1/0 cable, not to exceed 800 feet in length, circuit breaker setting not to exceed 600 amperes.
e. No. 1 cable, not to exceed 750 feet in length, circuit breaker setting not to exceed 600 amperes.
f. No. 2 cable, not to exceed 700 feet in length, circuit breaker setting not to exceed 600 amperes.
g. No. 3 cable, not to exceed 650 feet in length, circuit breaker setting not to exceed 600 amperes.
h. No. 4 cable, not to exceed 600 feet in lenght, circuit breaker setting not to exceed 500 amperes.
i. No. 6 cable, not to exceed 550 feet in length, circuit breaker setting not to exceed 300 amperes.
6. The 575-volt circuit breaker shall be provided with a means to provide short-circuit, overcurrent, grounded-phase, undervoltage and ground monitoring protection. The instantaneous unit for the 575-volt circuit breaker shall be adjusted to trip at the settings specified below when the following cable sizes are connected between the 575-volt circuit breaker and the piece of equipment being moved:
a. No. 4/0 cable, not to exceed 1,000 feet in length, circuit breaker setting not to exceed 700 amperes.
b. No. 3/0 cable, not to exceed 900 feet in length, circuit breaker setting not to exceed 700 amperes.
c. No. 2/0 cable, not to exceed 850 feet in length, circuit breaker setting not to exceed 700 amperes.
d. No. 1/0 cable, not to exceed 800 feet in length, circuit breaker setting not to exceed 700 amperes.
e. No. 1 cable, not to exceed 750 feet in length, circuit breaker setting not to exceed 700 amperes.
f. No. 2 cable, not to exceed 700 feet in length, circuit breaker setting not to exceed 700 amperes.
g. No. 3 cable, not to exceed 650 feet in length, circuit breaker setting not to exceed 600 amperes.
h. No. 4 cable, not to exceed 600 feet in lenght, circuit breaker setting not to exceed 500 amperes.
i. No. 6 cable, not to exceed 550 feet in length, circuit breaker setting not to exceed 300 amperes.
7. The 480-volt circuit breaker shall be provided with a means to provide short-circuit, overcurrent, grounded-phase, undervoltage and ground monitoring protection. The instantaneous unit for the 480-volt circuit breaker shall be adjusted to trip at the settings specified below when the following cable sizes are connected between the 480-volt circuit breaker and the piece of equipment being moved:
a. No. 4/0 cable, not to exceed 1,000 feet in length, circuit breaker setting not to exceed 800 amperes.
b. No. 3/0 cable, not to exceed 900 feet in length, circuit breaker setting not to exceed 800 amperes.
c. No. 2/0 cable, not to exceed 850 feet in length, circuit breaker setting not to exceed 800 amperes.
d. No. 1/0 cable, not to exceed 800 feet in length, circuit breaker setting not to exceed 800 amperes.
e. No. 1 cable, not to exceed 750 feet in length, circuit breaker setting not to exceed 800 amperes.
f. No. 2 cable, not to exceed 700 feet in length, circuit breaker setting not to exceed 800 amperes.
g. No. 3 cable, not to exceed 650 feet in length, circuit breaker setting not to exceed 600 amperes.
h. No. 4 cable, not to exceed 600 feet in lenght, circuit breaker setting not to exceed 500 amperes.
i. No. 6 cable, not to exceed 550 feet in length, circuit breaker setting not to exceed 300 amperes.
8. Permanent label(s)showing the maximum circuit breaker setting(s) and maximum trailing cable length(s) shall be installed and maintained near each 480-volt, 575-volt and 995-volt circuit breaker. The permanent label(s) shall be maintained legible.
9. When the generator set is used to move equipment, a No. 1/0 A.W.G. or larger external ground conductor shall be solidly connected between the frame(s) of the diesel generator set and mining equipment being powered, and between the trailing cable coupler and the frame of the equipment where the cable coupler connects to the coupler of the equipment.
10. The 995-volt portable cable(s) that extend from the generator to mobile equipment shall be type SHD-GC with a minimum of 2,000-volt rating, and shall have an outer jacket that has been accepted by MSHA as flame-resistant. All other portable cables used to supply power to 480-volt or 600-volt equipment shall a minimum of 2,000-volt rating and shall have an outer jacket that has been accepted by MSHA as flame-resistant.
11. A strain relief shall be provided on each end of cable(s) that extend between the generator and the piece of mobile equipment being powered.
12. Prior to moving each piece of equipment, and upon start-up of the diesel generator, a functional test of each ground fault and ground wire monitor system shall be performed by a qualified electrician who meets the requirements of 30 CFR 75.153.
13. The diesel generator system shall not be operated until after MSHA has inspected the equipment and determined that it is in compliance with all the above terms and conditions and all applicable requirements of 30 CFR, Part 75.
14. The circuit breakers that supply 480-volt, 575-volt and 995-volt power circuit(s) to the equipment being moved shall be limited to the use of only one circuit breaker at a time when a piece of equipment is being moved.
15. Prior to using the diesel generator system, training shall be conducted for all qualified persons on the proper testing procedures to be utilized. The training shall be "hands on" specific, and shall be incorporated into the Part 48 training plan.
16. Within 60 days after this Proposed Decision and Order become final, the Petitioner shall submit proposed revisions for its approved 30 CFR Part 48 training plan to the Coal Mine Safety and Health District Manager. These proposed revisions shall specify the following:
a. The “hands on” specific training specified in Condition No. 15;
b. Initial and refresher training regarding the terms and conditions stated in the Proposed Decision and Order; and
c. Training in the hazards of setting short circuit interrupting device(s) too high to adequately protect the 480-volt, 575-volt and 995-volt cables.
Any party to this action desiring a hearing on this matter must file in accordance with 30 CFR 44.14, as amended, (Federal Register 53430, December 28, 1990) within 30 days. The request for hearing must be filed with the Administrator for Coal Mine Safety and Health, 4015 Wilson Boulevard, Arlington, Virginia 22203.
If a hearing is requested, the request shall contain a concise summary of position on the issues of fact or law desire to be raised by the party requesting the hearing, including specific objections to the proposed decision. A party other than Petitioner who has requested a hearing shall also comment upon all issues of fact or law presented in the petition, and any party to this action requesting a hearing may indicate a desired hearing site. If no request for a hearing is filed within 30 days after service thereof, the Decision and Order will become final and must be posted by the operator on the mine bulletin board at the mine.
_________________________________
Robert A. Elam
Deputy Administrator
for Coal Mine Safety and Health
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