CONTENTS
1 HAZARDS OF ELECTRICITY............................................................................................................7
1.1 DANGERS OF ELECTRICAL CURRENT..........................................................................................7
General...........................................................................................................................................7
The hazards of electric current.........................................................................................................7
The effects of electric current on humans.........................................................................................9
Impact of direct current (DC)..........................................................................................................11
Electric shock first aid....................................................................................................................12
The physiological effects of electric current....................................................................................12
1.2 PROTECTION AGAINST ELECTRIC SHOCK.................................................................................13
Basic protection............................................................................................................................13
Fault protection.............................................................................................................................14
Additional protection with fault current protection...........................................................................14
1.3 ARC FLASH HAZARDS...............................................................................................................14
1.4 THE EFFECTS OF ELECTRIC AND MAGNETIC FIELDS..................................................................16
1.5 CAUSES OF ELECTRICAL INJURIES............................................................................................17
2 LAWS, REGULATIONS, AND POSITION OF SFS 6002 STANDARD....................................................19
2.1 REQUIREMENTS OF THE ACTS..................................................................................................19
2.2 THE POSITION OF THE ELECTRICAL SAFETY STANDARD SFS 6002………………………………………...19
2.3 DEVIATION FROM THE STANDARD.............................................................................................21
3 SAFE OPERATION....................................................................................................................... 26
3.1 BASIS FOR SAFE OPERATION................................................................................................... 26
3.2 INSTRUCTING.......................................................................................................................... 26
3.3 TRAINING IN SAFETY AT ELECTRICAL WORK............................................................................. 28
3.4 EMERGENCY MEASURES......................................................................................................... 28
3.5 FIRST AID TRAINING................................................................................................................. 29
3.6 COMMUNICATION DURING WORK AND FLOW OF INFORMATION............................................. 30
3.7 WORK AREA.............................................................................................................................31
3.8 TOOLS, ACCESSORIES, AND EQUIPMENT..................................................................................31
3.9 PERSONAL PROTECTION......................................................................................................... 32
3.10 DRAWINGS, DOCUMENTS, AND SIGNS.................................................................................. 35
Examples of signs......................................................................................................................... 37
4 PERSONS PERFORMING ELECTRICAL WORK AND THE ORGANISATION………………………………….. 39
4.1 PERSONS PERFORMING ELECTRICAL WORK............................................................................ 39
Ordinary person............................................................................................................................ 39
Instructed person.......................................................................................................................... 40
Electrically skilled professional...................................................................................................... 40
Works on similar types of equipment..............................................................................................41
4.2 ORGANISATION....................................................................................................................... 42
Areas of responsibility of the organisation...................................................................................... 42
Person in charge of electrical work................................................................................................. 42
Work controller (WC), “työnaikaisen sähköturvallisuuden valvoja” (STV).......................................... 46
How is the work controller nominated?.......................................................................................... 46
When shall a work controller be nominated?.................................................................................. 47
The holder of the electrical installation........................................................................................... 49
Person in charge of the operation................................................................................................... 49
5 OPERATIONAL PROCEDURES..................................................................................................... 54
5.1 WHAT OPERATIONAL PROCEDURES?....................................................................................... 54
Permissible operational procedures for different persons................................................................ 58
Instructed person.......................................................................................................................... 58
Electrical professional................................................................................................................... 58
5.2 OPERATIONAL INSPECTIONS................................................................................................... 58
Measurement............................................................................................................................... 59
Categories of measurement equipment ......................................................................................... 59
Testing.......................................................................................................................................... 60
6 WORKING PRACTICES................................................................................................................ 63
6.1 GENERAL................................................................................................................................ 63
Specific risk factors related to the work.......................................................................................... 63
Work procedures........................................................................................................................... 64
6.2 DEAD WORKING...................................................................................................................... 65
Basis............................................................................................................................................ 65
Five safety rules............................................................................................................................ 65
Permission to start work................................................................................................................ 83
Re-energizing of the work location.................................................................................................. 83
6.3 LIVE WORKING........................................................................................................................ 85
What is live working?..................................................................................................................... 85
Definition of live working zones...................................................................................................... 85
Who is allowed to perform live working?......................................................................................... 88
Organisation of live working........................................................................................................... 90
Tools and personal protection equipment used in live workings........................................................91
Live working in short.......................................................................................................................91
6.4 WORKING IN THE VICINITY OF LIVE PARTS................................................................................ 93
Division of vicinity works................................................................................................................ 95
Definition of the vicinity zone......................................................................................................... 96
Working in the vicinity of overhead lines......................................................................................... 98
Working above a live overhead line with a mobile or movable machine is mainly prohibited!............. 99
Transportations in the vicinity of overhead lines............................................................................ 100
Other works in electrical rooms in the vicinity of live parts..............................................................102
Instructing a person performing other work...................................................................................103
Tools........................................................................................................................................... 104
7 MAINTENANCE PRACTICES....................................................................................................... 106
7.1 GENERAL.............................................................................................................................. 106
7.2 PERSONNEL.......................................................................................................................... 106
7.3 REPAIR WORKS......................................................................................................................107
7.4 REPLACEMENT WORKS..........................................................................................................107
Replacement of fuses..................................................................................................................107
Permissible fuse replacement works.............................................................................................107
Replacement of lamps and starters..............................................................................................109
7.5 INTERRUPTION AND FINISHING OF MAINTENANCE WORK...................................................... 110
8 WORKS CONCERNING ELECTRICAL VEHICLES.......................................................................... 112
8.1 GENERAL.............................................................................................................................. 112
9 APPENDIXES ............................................................................................................................ 113
APPENDIX 1: Division of tasks of operation controller.................................................................... 113
APPENDIX 2: Division of tasks of the work controller ..................................................................... 114
APPENDIX 3: The correct answers to the Test your knowledge questions ....................................... 115