ELECTRIC CIRCUIT

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ELECTRIC CIRCUIT

• VISUAL INSPECTIONS

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COURSE OBJECTIVES
DISCUSSION AND REVIEW OF ELECTRICAL INSPECTION
TECHNIQUES AND METHODS
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REVIEW FILES

• VIOLATION HISTORY
• PREVIOUS INSPECTIONS
• INPUT FROM PREVIOUS INSPECTOR

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VISUAL OBSERVATIONS AT THE MINE

• POWER LINES
• GEN SET
• PLANT RUNNING OR NOT

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PRE-INSPECTION CONFERENCE

• REVIEW (12028)
• DISCUSS TEST METHODS
• MAINTAINENCE PROCEDURES

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INSPECTION PROCEDURES

• SELECT A STARTING POINT
• PIT
• MILL
• PLANT

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PRIMARY CRUSHER

• LOOKING AT DUMP POINT
• GUARDS
• SAFE ACCESS
• OPERATORS BOOTH

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ELECTRICAL ITEMS

• CABLE SIZE
• CABLE CONDITIONS
• CABLE CONNECTORS ?
• STRAIN RELIEF ?
• MOTORS (SIZE, MECHANICAL CONDITION, LOCATION

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A-PROCEED TO THE MCC TO GATHER ELECTRICAL
INFORMATION IF POSSIBLE

• INDICATOR LIGHTS BEING USED ?
• WHAT ARE THE STARTER TYPES?
• WHAT CONDITION ARE THEY IN?
• HOUSKEEPING
• FUSES LAYING AROUND, ETC.

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430-61,62
NEC 430-152 NEC 430-52
430-28
430-81 430-98
430-101, 113
430-31,44
430-21-29 400-5A,B TABLES 310
430-21,29
430-51,58, TABLE 431-152
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MOTOR BRANCH CIRCUIT /SHORT CIRCUIT AND GROUND
FAULT PROTECTION

• RATING OR SETTING FOR INDIVIDUAL MOTOR
  CIRCUITS
• NEC 430-152, ALSO REFER TO 430-52

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DATE___/____/______ I.D. _______________ EVENT
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POWER SUPPLY
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CHECK MOTOR CONTROLLERS
NEC 430-81,98
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FUSES OR CB RATINGS
NEC 430-51,58 TABLE 152
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DISCONNECTING MEANS?
NEC 430-101,113
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MOTOR BRANCH CIRCUIT CONDUCTORS

• NEC 430-21 THRU 29

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TAP CONDUCTORS

• NEC 430-28

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FEEDER CONDUCTORS

• NEC 430-61, 62

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C-GENERATOR SIZE
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NAMEPLATE DATA

• NEC 445-3

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SUBSTATION INSPECTIONS
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ELECTRICAL ITEMS TO LOOK AT

• LOCKS
• SIGNS
• FENCE CONDITION HEIGHT
• GROUNDING
• HOUSEKEEPING
• PERSONNEL AUTHORIZED TO ENTER
• HOW OFTEN DO THEY ENTER

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SUBSTATION CHECKS

• CHECK FOR OBVIOUS HAZARDS BEFORE ENTERING
• LOOSE OR BROKEN SUPPORTS
• LOOSE CONDUCTORS
• DRY VEGETATION WITHIN 25 FOOT
• FIRE EXTINGUISHERS

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CHECK TRANSFORMER CONNECTIONS

• PRIMARY - CONFIGURATION ?
• SECONDARY- CONFIGURATION WYE---------DELTA ?

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OTHER PROTECTIVE DEVICES
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OTHER ELECTRICAL INSPECTION ITEMS

• BUSHINGS/STRAIN RELIEFS

• 1-CORDS (EXTENSION, LIGHT, WELDER LEADS)

• LABELING

• COVERS MISSING

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EXITS IN ROOMS

• PARTS TRAILERS

• Clearance around panels

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OUTDOOR EQUIPMENT HEATER PLUG-INS
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CHECK ILLUMINATION

• MAY BE EVENING SHIFTS AT SOME OPERATIONS
• TO INCLUDE ALL WORKING AREAS

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REVIEW LOCK OUT/TAG OUT PROCEDURES
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ELECTRICAL VIOLATION HISTORY 2000M/NM ONLY

• 63,624 TOTAL VIOLATIONS ISSUED
• 9,516 VIOLATIONS ISSUED (SURFACE)
• 1,157 VIOLATIONS ISSUED (UG)

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ELECTRICAL VIOLATION HISTORY 2001M/NM ONLY

• 54,837 TOTAL VIOLATIONS ISSUED
• 8,263 VIOLATIONS ISSUED (SURFACE)
• 719 ISSUED (UG)