Name: MGM 115 Type 7 660/1100V Screened Mining Cable with Bare Earth Core
Brand: TEBAOFLEX

Product overview

MGM 115 Type 7 is a 660/1100 V flexible trailing cable with three screened phase cores, one unscreened pilot core and one bare copper earth conductor. It is built to the MGM 115 specification of the Turkish Hard Coal Enterprises MGM mining cable series, in seven sizes from 3×16+16+16 to 3×120+50+70 mm².

The datasheet assigns Type 7 to excavating and crushing machines and equipment, in deep mines where explosive gases and dust can accumulate and on the surface. It is the widest-ranging MGM 115 type, and its datasheet gives the electrical data a designer needs for longer runs: intermittent ratings, reactance at 50 and 60 Hz and a three-phase voltage-drop figure.

Browse the MGM mining cable category for the other cables in the Turkish hard coal MGM series or download the MGM 115 Type 7 datasheet (PDF).

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Application & Features

Selection overview

Excavators, shovels, loaders and crushers are fed through a trailing cable that follows the machine as it moves and is dragged, reeled and run over. Type 7 is the general-purpose MGM 115 answer for that duty: it covers small machines from 3×16 mm² up to large ones on 3×120 mm², with a continuous rating from 85 to 295 A and a higher intermittent rating for machines that load in cycles.

The design choice that sets Type 7 apart is the bare earth conductor. It is not insulated and is laid in contact with the tinned copper and nylon braids of the three phase cores, so earth conductor and screens form one low-resistance return path (0.26 to 0.7 Ω/km in parallel). A damaged phase core faults to that earthed layer first and the earth-leakage protection trips. The unscreened pilot core carries the pilot or earth-continuity circuit of the gate-end or machine switch.

Excavator and crusher supply660/1100 V trailing supply for excavating and crushing machines underground and on the surface.
Bare earth on the screensBare copper earth in contact with the phase screens gives one combined earth return.
Seven sizesFrom 3×16+16+16 to 3×120+50+70 mm², 85 to 295 A continuous at 25 °C.
Design data includedReactance at 50 and 60 Hz, voltage drop and insulation resistance for each size.

Electric rope shovel excavator on crawler tracks at an open-pit mine, the kind of excavating machine an MGM 115 Type 7 trailing cable supplies — Electric rope shovel at an open-pit mine. Excavators of this kind take their power through a flexible trailing cable such as MGM 115 Type 7. Photo: Vic Tor, CC BY 3.0, via Wikimedia Commons.

Specifications

Technical data

Values from the current TEBAOFLEX MGM 115 Type 7 datasheet. The final construction is confirmed on the approved datasheet for your order.

Electrical, mechanical and material data

Parameter	Value
Rated voltage	660/1100 V
Test voltage	2.5 kV
Conductor	Stranded, tinned copper wire, IEC 60228 Class 5
Insulation	EPR; ground core is not insulated
Phase-core screen	Tinned copper / nylon braid
Pilot and earth cores	Pilot unscreened; earth core bare copper
Lay-up	All cores laid up in contact with the bare copper earth conductor
Separator	Colored textile tape for core identification
Bedding	Rubber-based bedding compound
Outer sheath	Heavy-duty chloroprene compound
Core arrangement	3 screened phase cores + 1 unscreened pilot core + 1 bare copper earth core
Armour	None (non-armoured cable)
Application	Excavating, crushing machines and equipment; deep mines where explosive gases and dust can accumulate, and surface use

Technical data: MGM 115 Type 7

Parameter	Unit	3×16+16+16	3×25+16+16	3×35+18+16	3×50+25+25	3×70+35+35	3×95+50+50	3×120+50+70
Phase cores / cross-section	mm²	3×16	3×25	3×35	3×50	3×70	3×95	3×120
Phase stranding	mm	126/0.40	196/0.40	276/0.40	396/0.40	360/0.50	475/0.50	608/0.50
Phase conductor diameter	mm	5.5	6.75	8	9.75	11.6	12.75	15.1
Phase insulation thickness	mm	1.5	1.6	1.6	1.7	1.8	2	2.4
Earth core / cross-section	mm²	1×16	1×16	1×18	1×25	1×35	1×50	1×50
Earth stranding	mm	126/0.40	126/0.40	147/0.40	196/0.40	276/0.40	396/0.40	396/0.40
Earth conductor diameter	mm	5.5	5.5	6	6.75	8	9.75	9.75
Pilot core / cross-section	mm²	1×16	1×16	1×16	1×25	1×35	1×50	1×70
Pilot stranding	mm	126/0.40	126/0.40	126/0.40	196/0.40	276/0.40	396/0.40	360/0.50
Pilot conductor diameter	mm	5.5	5.5	5.5	6.75	8	9.75	11.6
Pilot insulation thickness	mm	1.5	1.5	1.5	1.6	1.6	1.7	1.7
Continuous current rating at 25 °C	A	85	110	135	170	205	250	295
Intermittent current rating at 25 °C	A	96	125	150	200	250	310	355
Phase conductor	Ω/km	1.24	0.795	0.565	0.393	0.277	0.21	0.164
Pilot conductor	Ω/km	1.24	1.24	1.24	0.795	0.565	0.393	0.277
3 screens and earth in parallel	Ω/km	0.7	0.6	0.6	0.5	0.34	0.28	0.26
Nom. reactance at 50 Hz	Ω/km	0.109	0.107	0.101	0.098	0.095	0.094	0.092
Nom. reactance at 60 Hz	Ω/km	0.131	0.128	0.121	0.118	0.114	0.113	0.11
Min. insulation resistance at 20 °C	MΩ/km	435	375	325	285	0.26	0.25	250
3-phase voltage drop at full load	Ω/km	2.62	1.68	1.2	0.84	0.61	0.47	0.38

Selection note: before ordering, ask our engineers to confirm the overall diameter, cable weight, copper weight, bending radius, sheath thickness, pulling tension, operating temperature, core colours and sheath colour with the quotation, together with drum length and marking.

Standards & References

Applicable standards and compliance

Design specificationMGM 115, the flexible trailing cable specification in the Turkish Hard Coal Enterprises MGM mining cable series (MGM 101, 109, 110, 111, 112, 115 and 118); Type 7 is one of its core arrangements.
Conductor referenceStranded tinned copper conductors to IEC 60228 Class 5.
Voltage scope660/1100 V rated voltage and 2.5 kV test voltage.
ApprovalsMine-authority approvals, type-test reports and marking requirements are confirmed and quoted per order.

Construction

Material and build-up

MGM 115 Type 7 is a round five-core trailing cable. Three braid-screened phase cores and one insulated, unscreened pilot core are laid up in contact with a bare copper earth conductor, then covered with a rubber bedding compound and a heavy-duty chloroprene sheath. There is no armour.

Conductor: stranded tinned copper wire to IEC 60228 Class 5, from 126/0.40 mm on 16 mm² to 608/0.50 mm on 120 mm² phase cores.
Insulation: EPR on phase cores (1.5 to 2.4 mm) and on the pilot core (1.5 to 1.7 mm); the earth core is not insulated.
Phase-core screen: tinned copper and nylon braid over each phase core, earthed through contact with the bare earth conductor.
Earth core: bare stranded copper, 16 to 50 mm², laid in contact with the phase screens to form one earth return.
Pilot core: one insulated, unscreened core of 16 to 70 mm² for the pilot or earth-continuity circuit.
Separator: coloured textile tape for core identification.
Bedding: rubber-based bedding compound that fills the layup.
Outer sheath: heavy-duty chloroprene compound for abrasion and tear resistance in trailing service.

FAQ

Selection questions

What is MGM 115 Type 7 and how does it differ from the other MGM 115 types?

Type 7 is the MGM 115 trailing cable with three screened phase cores, one unscreened pilot core and a bare copper earth laid in contact with the screens, without armour. Type 7M has the same layout with a screened pilot, Type 7S replaces the pilot with a unit of three thin cores, Type 14 and Type 16 use insulated earth cores (one in Type 14, two in Type 16) plus a pilot, and Type 11 has three screened phase cores with a single 16 mm² pilot conductor.

How do I select the size of Type 7?

Start from the machine's full-load current: 85 A for 3×16 up to 295 A for 3×120 continuous at 25 °C, with the intermittent column for cyclic loads such as shovels and crushers. Then check voltage drop over the trailing length with the datasheet resistance and reactance, and confirm that the combined screen and earth resistance suits the earth-fault protection setting.

Which details are needed for a quotation?

Send the cable type (for example 3×50+25+25), the length per drum and number of drums, the machine and its supply voltage, the pilot or earth-continuity system in use, any sheath marking, and the mine authority whose approval or test report you need. Because the Type 7 datasheet does not list diameter or weight, we confirm those with the quotation.

Type 7 or Type 7M: which one should I choose?

Both have three screened phase cores, a bare earth and one pilot core. In Type 7 the pilot is unscreened, which keeps the cable simpler to terminate and suits a pilot that carries a control signal. Type 7M adds a braid over the pilot so that damage to the pilot also shows as an earth fault; choose it when the protection scheme depends on the pilot circuit. Other MGM types are listed in the MGM mining cable category.

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Request this cable.

Send the model and cable type (e.g. 3×50+25+25), drum lengths and total length, supply voltage, pilot system, marking and mine approval requirement.

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MGM 115 Type 7 660/1100V Screened Mining Cable with Bare Earth Core

Application & Features