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21059

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Pemco Medium Voltage Ground Monitor, Model PEM-406AR, is designed and manufactured to be used in underground mining, tunneling, and surface power distribution systems where ground wire monitoring is required. This Ground Monitor is an impedance type monitor that provides fast, sensitive protection against ground faults or open circuit conditions in the pilot ground wire circuit loop.

This monitor is designed to be used with molded case circuit breakers and has adequate capacity and sensitivity to perform well on all circuits. Generally, the PEM-406AR cable monitor is mounted in a power center or distribution box and becomes a part of the total circuit protection. The PEM-406AR has been designed as a retrofit package, or as an integral part of new power center design.

Features & Benefits

Ground Monitoring Assemblies for service in mine applications are constructed for installation in portable shed enclosures as a part of the power center electrical circuit.  This equipment is designed to withstand the mechanical stresses imposed on the devices during normal underground mining operations.  Since mining monitors are specifically used for personnel protection, the units are assembled with materials of the highest level of technology.

• Fail Safe
• High Sensitivity
• Low Cost
• Small in Size
• Function Indicating Lights • System Flexibility
• MSHA Approved

Specifications

The PEM-406AR Impedance Monitor is housed in a 0.0625-inch thick aluminum enclosure with an irridite finish as a guard against corrosion. All component parts used in the PEM-406AR Monitor were engineered to provide a space-saving design without sacrificing electrical performance. Assembly of the units is done under a quality-controlled atmosphere and wired to perform according to applicable codes.

The current transformer, Part No. 46130, which is used for ground fault, is potted in a No. 3265 epoxy resin compound and has one-foot leads for easy installation. The current transformer is installed in the power center so that the three-phase conductors on the load side of the circuit breaker pass through the current transformer before it connects to the output receptacle. Next, the leads from the current transformer are connected to the associated terminals on the PEM- 406AR Monitor.