Cables Requiring DGMS Approval for Coal and Oil Mines

Government of India Ministry of Labour and Employment Directorate General of Mine$ Safety DGMS Circular (Approval) _f7 Dhanbad, To All Owners/Agents/Managers of Coal Mines, Oil Mines & the Manufacturers Subject: Cabl— requiring DGMS approval for use in Coal and Oil Mines- Replacement of apptoval by special order in writing with Genera' approval.

Cables are widely used in mines for the purpose of transmission and distributon of electric power, communication and tor applications. Cables In Ind}a are manufactured as per the relevant BIS standards depending on their type, voltage and application. The use of cables in mines for transfer of electricaE energy or signals is associated with hazards like shock, fire, explosion etc., if the proper of cables of adequate rating and strength are not installed, not used and not being maintained in proper manner based on their application.

Mining being a hazardous profession requires that Hoe cables need to remain safe, robust and retiable under prolonged usage even in adverse conditions. Keeping this in view, the Ch}ef Insl*ctor of Mines (aiso designated as Director Genera} of Mines Safety), approves cables by special orders to use mines on case to case basis under Regulation 181(3) of Coe! Mines Regurations, 1957 and Regulation 75(2) of the Oil Mines Regulations, 1984 based on the provisions therein and Wie same has been notified in Gazete notification of India vide G.S.R.1334 dated 3rd November, 1979.

In order to bring simplification, it is felt that the subject matter is requrred to be brought under domain of general approval, However, in order to prevent any compromise on qualiW and safety aspects, certa}n aonditions are specfied for compliance, It is decided that following prescribed standards and parameters Shail be adhered to during manufacturing process and use of cables in mines, Testing of cables:

The tests on cables are broadly grouped as routine tests, type tese, acceptance tests and optiona} tests.

1.1 Routine Tests — Tests made by the manufacturer on all finished cable lengths to demonstrate the integrity of the cable.

1.2 1.3 1.4 1.5 Type Tese Tests required to be made before supply on generai commercial basis on a type of cable in order to demonst•ate satisfactory pefornance characteristics to meet the intended application.

NOTE -Tese tests are of such a nature that after they have been made they need not be repeated unless changes are made in the cable materials or design which might change the performance characteristics.

Aceeptance Tsu — Tests carried out on samples taken from a lot for the purpose of acceptance of the lot, Optional Tests — Special tesE to be carried out, when required, by agreement between the purchaser and the supplier.

The type test report of the cable made at a laborato:y as mentioned in the DGMS approval policy 2015 or its revlsed version for the parameters specified under the relevant sbndard shall be accepted.

2. Standards The construction of cabEes for use in mines shall also comply with the relevant provisions of the Central Electricity Authority (Measures relating to Safety and Electrt supply) Regulations, 2010 as amended from time to time.

The cables shoutd confotm to the prescribed sW'dards, If the standard of 3 particuÉar type of cable is not available in Endia, Mne relevant intematlona! standard with test reports from any laboratory as mentioned in the approval poiicy 2015 or its revised version may be accepted.

BIS standard IS-1554 part-I IS-1554 part-II 199968 part-I 199968 part-il IS 1449-4 IS-7098 part 1 19098 part IS-2593 Type of cable PVC insulated(heavy duty) electric cables for working voltages u to and includin 1100V PVC insulated(heavy duty) ekctric cables for working voltages from 3.3KVu to and Tac'udin 11KV Elastomer insulated cables for working voltages up to and includin 1100V EEastomer insulated cables for working vottages from 3.3KV up to and Includin 33KV Elastomer insulated flexible cables for use in mines voltage rades covered are 3.8 6.6and635 IIW Cross-linked polyethylene insulated thermoplastic sheathed cables for workin volta esu to and inciudin 1100V Cross-finked polyethylene insulated thermop\astic cables for working voEtages from 3.3KV up to and *ncluding 33KV Flexible Cables for Mines' Ca -Lam s While conforming to the relevant 81S or equivalent standards or any intemational relevant standards, the constituent conductors and protective armouring shall not be of aluminum for use in below ground coal mines and hazardous area locations of Oil mines, The conductors shatl be of ao r oni 3.1 3.2 3.3 Flexible power cables for Oil Rigs shall comply with the provisions stipulated in !Fne with IS-9968 read with the latest BHEL specifications (OR120Q3j OR12002 & OR12005) as the case may be.

Identification:

Manufacturer's Identification: The manufacturer shall be identified throughout the length of the cable by means of a tape bearing the manufacturer*s name or trade—mark or by manufacturers name Or trade-mad( tking indented, printed or embossed on the cable. fn case none of these methods can be employed or if Wie purchaser so desires, coiout identification threads in accordance with a scheme approved by the Bureau of Indian Standards (BIS) / relevant internationaf standard shall be employed. ne indentat$onj prinbng or embossing shali be done only on the outer sheath.

Cable identification In order to distinguish these electric cables from telephone cables and other cables, the word 'ecectric' shall be indented, printed* or embossed throughout the length of the cablet case of cables intended for use in mines, the word 'mining' also shall be indented, printed or embossed throughout the length of the cable. The indentation, printing or embossing shall be done only cn the outer sheath.

The following special cables shali be identified by indentng, emt»ssing or printing the appropriate legend on the outer sheath throughout the cable lengtl, in addibon to the existing marking requirements:

T e of cables 1m roved fire formance for cate o Cl 1m roved fire erformance for cate o C2 L end FRLSH Cable Code —The following codes shall be used for designating the cable:

Constituent Aluminium conductor XLPE insulation Steel round wire armour Non-ma netic round wire armour Steeestri armour Non-ma neticsbi armour Doubie steel stri armour Double steel round wire armour PVC outer sheatl Elastomer insulation sheath Braidin com undin or varnishin Earth continui oonductor Code Letter Wa ECC NOTE No code letter for conductor is required when the conductor material is copper 3.4 3.5 Voltage Identification: The vottage grade of the cable shall be identified throughout the length of the cable by means of a tape the voltage grade of the cable (for example 1kV, 3.3kv, 3.81/6,6kV and 6.35jiikV) or by the voltage grade being printed, embossed or indented on outer sheath.

Type of Cable: The cable tygæ shak also be ma*ed using the appropriate designation as given in the relevant (ßIS) / relevant international standard throughout the 'ength of cabEe by any of the means indicated above.

4 Marking and Packing 4.1 4.2 4.3 5.1 5.2 5.3 The cabies shall be wound on d"dm (as per IS 10418).

The cut ends of the cable Shail be sealed by means of non-hygroscoplc sealing material.

lhe cable shall cany the fo"owtng information either stenciled on the drum or contained in a label attached to t:

a.

b, d, m k.

Reference to the relevant Standard;

Manufacturer's name, brend name or trademark;

Type of cabEe and voitage grade;

Number of cores;

Nominal cross-secijonal area ot conductor;

Cable type;

Length of cable on the dam;

Number of leagd•s on drum (if more than one);

Direction of rotanon of drum (by means of an arrow);

Approximate gross mass;

Country of manufacture; and Year of manufacturer.

The manufacturer shall:

Have Reliable and adequate facility for manufa&uring & testing of cables and fully responsib!e for its quality. The indigenous cable manufacturers shall have valid BIS ticense- Take a note of the relevant standards amended from time to time, provisions of the Central Eiectrfcity Authority (measures relating to safety and electric supply)r Regulations,2010 and any Oher Insbuctions / circulars issued from this Directorate in respect of manufacturing of cables, Furnish to the user the type and routine test reporE, cross sectional drawings of the cables, giving dimensional details for each size of cable. An illusfrdted literature on the cable, giving technica} Information on current ratings, cable cons-tans, short circuit ratings, de-rating factors for different types of cables, The manufacturer shall also furnlsh other details iike packing date, weights and other relevant information pertinent to their product(s) to the aiong with each consignment, and the users shall also have the responsibility to get such test reports/literaturefdocuments from the manufacturer whiie purchasing and using the cable in doe mines.

" 5.4 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 Shal seal the cable ends properiy so that ingress of moisture is completely prevented, a. The individual core endings shall be seated effectively with water resistant compound applied over the core and provided with a heat shrink3b*e cap of sufficient length wth adequate cushion space so that the conductor does not puncture me cap in case of movement of the core du€ing unwinding or laying.

Before sealing, the semi-conducing 'ayer on the cores may be removed for about 2mm at each end, to facilitate ched<ing the insuiabon resistance from one endf without removing the sealing cap at the other end.

b, The mulå cores should have an oveæll heat shrinkable cap with adequate end clearance and sufficient cushioning to prevent puncturing of the overall sealing cap due to stretching of the cores, The seating cap Shail have sumcient mechanical strengti and shall prevent ingress of Imisture into the cable. The ends of single core cables shali also be sealed on the same lines to prevent entry of moisture.

Any other precautions to preserve the quality of cabies shall be duty taken by the manufacturer, Users responsibilities:

Before usmg Me cables in mines, the user shall ensure that all cables conform to the relevant standards.

The cables shall be installed used and maintained complying with the provisions of the Central aectricity Authority (Measures reiating to Safety and Electric Supply)

Regulations, 2010 as amended from irne to time, Seleåion of mining cables shall be made as the guidelines in Annexure-A.

Storage, transpo&tion and use of cables shall be done as per me Manufacturers Instruction manual.

lhe user may visit the Manufacturer's works as and when necessary to ensure the required manufacturing and testing facilities available and shall also ensure receipt of valid test reports/aertjficates from the manufacturer.

The user shah keep the test reports, cross secBonaI drawmgs of tie cabEes with d}mensional details for each size of cable. An illustrated literature on the cabler giving technical mformation on current ratings, cable constants, short circuit ratings, de-rating factot•s for different types ofcabies installed and other relevant information shall be maintained as history records, The user shall conduct field observations from the date of Installation of the cable to assess the health and performance of the same. The records of the observaüon shall be maintained in a bound paged book kept for the duly signed by and competent cmc{als, countersigned by the Mine Manager.

In case, where the pefformance of a cable is not satisfactory/ where Ifiere is risk of causing hazard from such a particuEar type / lot of cables, tte same shall be forthwith removed from use by the user and information in this regard shau be sent to the manufacturer, concerned electrical inspector of mines and to the DDG(ElectricaD HQ, DGMS, Dhanbad.

S 6.9 The user shall be responsible for any violation to the provisions of the parameters and Guideiines laid in this order or violation of the provisions of the Cerfraæ Electridty Authority (Measures relating to Safety and Electric Supply) Regu\ationsj 2010 as amended from time to timer 6.10 The user shall maintain tecords of Installation or reinstallation of power cables and lighting cables giving relevant information of such cables in a bound paged book kept for the purpose signed by authorized and competent officials, countersigned by the mine Manager, Power and functions of the Chief Inspector of Mines or an Electrical Inspector of Mines.

7.1 7.2 8,2 8.3 The Chief Inspector of Mines ot an Electrical inspector of mlnes may inspect* check and examlne the manufacturing faciiiHes at any time, may examine the test report and may get samples tested during the course of inspection or send such samples for testing at any Govt. approved laboratories or a Test house accredited by NABL and not belonging to the manufacturer, subject to conflrmatfon of its abiEity to conduct such according to relevant standards, The cost of the test shal be bourne by me manufacturer.

The Chief Inspector of Mines or an Electrical Inspector of mines may inspect, check and examine the cables at any ume En the mine or/and may ask for the test reports of the cable. He may get the samples tested during the course of inspection or send such samples for testing in any Govt. approved/NABL accredited laboratory or a Test house at he cost of t7e user.

General Requirement The above guidelines shali be adhered by the Manufacturers and the Users for safe use of cables in mines and avoiding any unwarranted conditions.

The cables conforming to the sendardsg parameters and testing as mentioned above in this c}rcuiar, shal be considered as approved by the Chief Inspector of Mines by this general order as provided under regulation 181(3) of the Coal Mines Regulaöonsr 1957 and regulation 75(2) cf the Oil Mines Regulations, 1984.

The user shaft consider at par those manufacturers having valid approvals under special order of OGMS and those who comply with the parameters and guidelines prescribed in the genera* order for use of cables in mines.

Yours Faithfully, Director eneral of Mines Safety Anne*'we-A fsnemLQuuance for Selection of mining per 14494 : 1998 Cable type FTI FT4 (S)

FTS(S)

FT(S)

FTI 0 FTD3 FT03(S)

PLC2 to PLC5 PA.3 type of application Intrinsic safety cabEe in WG production systems requiring infrequent movement - 3 phase.

Intrinsic safety cable In UIG production systems requiring infrequent movement - 3phase and earth.

Cable for mobile production machines in U/G applications.

Cable for machines In U/G application- Craw'er mounted requiring medium degree of movement.

Cab'e for mobiEe producdon machines in UfG applications.

Heavy duty trailing cable for mob}e production machines in WG applications with multipujpose built-in attachmenb tike intermediate crusher, steei*tray conveyor, etc, for exampie road headers.

Heavy duty trailing cab!e for moblle production machines in U/G appücations with remote conb•ot/annundatlon requirements, for example sophisticated road headers, shearers in multipurpose packages, etc, suitable use as interconnecting cables also.

Heavy duty traiting cable for mobile production machines in WG application and surface use material handling application to satisfy space limitation, for example, Augar-ctmrdrill, Paddle feeders, Stacker/Reclaimer, etc.

Trailing cable for wheel mounted prcxiuction support machines caling for heavy reeling duty requirement in UIG mines, for exampfe, LHDS Low height SDL's, etc.

Cable for hand-held drills.

Cables for hand-held drilEs with intrinsic safety requirement.

Power feeders to transportation/ ventilation system in IJ/G mines.

Cable for lightlng and auxiliary circuits in UIG application.

Cabie for single phase/D,C, application.

PAI, 3PA1, 6PAI Cable requiring infrequent movement in OCM Zone prew to cause 3PA1 S extemal injury by thrust.

Cable wth intrinsic safe stem re uirin rotection a ainst electrical 6PA1(S)

3n-se 6 FTS 3€rcsr6Frcs 3FTiNS, 6FT}NS, IIFTINS 3Fi1NS/3f 6FTlNS/3, 11ffiNS/3 as well as mechanical adverse elements, for example* appltation area of Jumbo SH dri"s, Walking dragline, Power feeders in new excavation areas, etc.

OCM trai!Fng cable for machines requiring medium degree of movement* for example, Excavators, OCM trajiing cable for reeling duty, for example, BH drilÉf Excavators with CRD.

Trailing cable for heavy reeling duty OCM and mateäal handling applications requiring high terrlble sb-ength.

Trailing cable with space Fimit.ation in CRDg for example BWB'5, Stacker/ Recæaimers.

Hazardous duty mine Euger feeder in OCM, for example, Landline, NB: For any speciaæ applications where imported cables are proposed to be used in mines suitable recommendations may be considered based on the relevant standards on case to case bas}s.