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

C-GENERATOR SIZE

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)