Type 275 Mining Cable

Type 275 Mining Cable Description

Type 275 mining cable, a flexible 1.1/1.1kV cable conforming to AS/NZS 1802 standards. Sometimes also referred to as Type 275.1—the “.1” indicates that this specific cable series is rated for 1.1kV. Its configuration is 3+3+1, where three power conductors and three ground conductors are interconnected, with a central reinforcement provided by a guide core. This cable offers multiple conductor cross-sections, with power cores ranging from 16 mm² to 50 mm². 
Type 275 mining cable features EPR insulation and an HD-CSP outer sheath. Ethylene Propylene Rubber (EPR) insulation offers excellent dielectric strength and resistance to water treeing, while Ultra-High Strength Chlorosulfonated Polyethylene (HD-CSP) provides ozone resistance, extremely low water absorption, abrasion resistance, impact resistance, and crush resistance, while maintaining the required flexibility—properties particularly crucial in the harsh and demanding environments of mining operations. To enhance mechanical protection without compromising flexibility, a layer of polyamide yarn is also incorporated beneath the outer sheath.

Type 275 Mining Cable Construction

Conductor	Tinned annealed copper wires
Separator	Synthetic tape under insulation
Insulation	EPR (Ethylene Propylene Rubber ) compound type R-EP-90
Insulation Screen	Semi-conductive thermosetting compound
Cable Assembly	Three insulated power and three earth cores laid up with center hand direction on cradle separator with central pilot core
Inner Sheath	Semi-conductive thermosetting compound
Earth Covering	Semi-conductive thermosetting compound
Cradle Separator	Semi-conductive thermosetting compound
Reinforcing Braid	Polyamide Yarns
Sheath	HD-CSP (Heavy Duty Chlorosulphonated Polyethylene)
Sheath Colour	Black

Type 275 Mining Cable Specification

NO. CORES	POWER CORES			EARTH CONDUCTOR		PILOT CONDUCTOR		NOMINAL THICKNESS OF SHEATH, INCLUDING SEMI- CONDUCTING LAYER	NOMINAL DIAMETER	NOMINAL WEIGHT
	NOMINAL AREA SIZE （mm2）	NOMINAL THICKNESS INSULATION （mm）	NUMBER AND NOMINAL DIAMETER OF WIRES （n x mm）	NUMBER AND NOMINAL DIAMETER WIRES （n x mm）	THICKNESS SEMI-CON COVERING（mm）	NUMBER / NOMINAL DIAMETER WIRES （n x mm）	THICKNESS COVERING （mm）		mm	kg/100m
3+3	16	1.6	126x0.4	60x0.3	1	24/0.20	0.8	3.8	30.2	1450
3+3	25	1.6	209x0.4	100x0.3	1	24/0.20	0.8	4	33.9	2040
3+3	35	1.6	285x0.4	140x0.3	1	24/0.20	0.8	4.3	38.5	2701
3+3	50	1.7	380x0.4	99x0.4	1	40/0.20	0.8	4.7	43.1	3334

Type 275 Mining Cable Application

The Type 275 mining cable is a flexible low-voltage cable commonly used in underground coal mining. It finds extensive application across various industrial sectors, such as powering shuttle cars and serving as power supply cables for pumps. Shuttle Cars: Used as flexible power supply lines for shuttle cars operating at high speeds underground and subjected to significant tension. Pump Cables: Also employed as flexible supply cables for underground pumps.