ELECTRIC CIRCUIT
VISUAL INSPECTIONS
COURSE OBJECTIVES
DISCUSSION AND REVIEW OF ELECTRICAL INSPECTION TECHNIQUES AND METHODS
REVIEW FILES
•VIOLATION HISTORY
•PREVIOUS INSPECTIONS
•INPUT FROM PREVIOUS INSPECTOR
VISUAL OBSERVATIONS AT THE MINE
• POWER LINES
• GEN SET
• PLANT RUNNING OR NOT
PRE-INSPECTION CONFERENCE
• REVIEW (12028)
• DISCUSS TEST METHODS
• MAINTAINENCE PROCEDURES
INSPECTION PROCEDURES
• SELECT A STARTING POINT
• PIT
• MILL
• PLANT
PRIMARY CRUSHER
• LOOKING AT DUMP POINT
• GUARDS
• SAFE ACCESS
• OPERATORS BOOTH
ELECTRICAL ITEMS
• CABLE SIZE
• CABLE CONDITIONS
• CABLE CONNECTORS ?
• STRAIN RELIEF ?
• MOTORS (SIZE, MECHANICAL CONDITION, LOCATION
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.
NEC 430-152NEC 430-52
430-81430-98
430-28
430-61,62
430-31,44
430-101,113
430-21,29
430-21-29400-5A,B
TABLES 310
430-51,58,TABLE 431-152
MOTOR BRANCH CIRCUIT /SHORT CIRCUIT AND
GROUND FAULT PROTECTION
• RATING OR SETTING FOR INDIVIDUAL MOTOR CIRCUITS
• NEC 430-152, ALSO REFER TO 430-52
DATE___/____/______I.D. #_______________EVENT #___________
POWER SUPPLY
CHECK MOTOR CONTROLLERS
NEC 430-81,98
FUSES OR CB RATINGS
NEC 430-51,58TABLE 152
DISCONNECTING MEANS?
NEC 430-101,113
MOTOR BRANCH CIRCUIT CONDUCTORS
• NEC 430-21 THRU 29
TAP CONDUCTORS
•NEC 430-28
FEEDER CONDUCTORS
• NEC 430-61, 62
NAMEPLATE DATA
• NEC 445-3
SUBSTATION INSPECTIONS
ELECTRICAL ITEMS TO LOOK AT
• LOCKS
• SIGNS
• FENCE CONDITION & HEIGHT
• GROUNDING
• HOUSEKEEPING
• PERSONNEL AUTHORIZED TO ENTER
• HOW OFTEN DO THEY ENTER
SUBSTATION CHECKS
• CHECK FOR OBVIOUS HAZARDS BEFORE ENTERING
• LOOSE OR BROKEN SUPPORTS
• LOOSE CONDUCTORS
• DRY VEGETATION WITHIN 25 FOOT
• FIRE EXTINGUISHERS
CHECK TRANSFORMER CONNECTIONS
PRIMARY - CONFIGURATION ?
SECONDARY- CONFIGURATION WYE---------DELTA ?
OTHER PROTECTIVE DEVICES
• 1-CORDS (EXTENSION, LIGHT, WELDER LEADS)
• LABELING
• COVERS MISSING
• BUSHINGS/STRAIN RELIEFS
OTHER ELECTRICAL INSPECTION ITEMS
•PARTS TRAILERS
EXITS IN ROOMS
• Clearance around panels
OUTDOOR EQUIPMENT HEATER PLUG-INS
CHECK ILLUMINATION
• MAY BE EVENING SHIFTS AT SOME OPERATIONS
• TO INCLUDE ALL WORKING AREAS
REVIEW LOCK OUT/TAG OUT PROCEDURES
ELECTRICAL VIOLATION HISTORY 2000
M/NM ONLY
• 63,624 TOTAL VIOLATIONS ISSUED
• 9,516 VIOLATIONS ISSUED (SURFACE)
• 1,157 VIOLATIONS ISSUED (UG)
ELECTRICAL VIOLATION HISTORY 2001M/NM ONLY
• 54,837 TOTAL VIOLATIONS ISSUED
• 8,263 VIOLATIONS ISSUED (SURFACE)
• 719 ISSUED (UG)