AS 1674.2-1990

1 - AS 1674.2-1990 SAFETY IN WELDING AND ALLIED PROCESSES - ELECTRICAL
4 - PREFACE
5 - CONTENTS
6 - SECTION 1. SCOPE AND GENERAL
6 - 1.1 SCOPE.
6 - 1.2 SAFETY REQUIREMENTS.
6 - 1.2.1 Power sources.
6 - 1.2.2 Electrical safety for welders.
6 - 1.3 REFERENCED DOCUMENTS.
6 - 1.4 DEFINITIONS.
6 - 1.4.1 Allied processes.
6 - 1.4.2 Authorized inspector
6 - 1.4.3 Authorized person
6 - 1.4.4 Connecting links
6 - 1.4.5 Conductors.
6 - 1.4.6 Control leads
6 - 1.4.7 Distribution box
7 - 1.4.8 Installation (electrical)
7 - 1.4.9 Leads (or cables).
7 - 1.4.10 Open-circuit voltage
7 - 1.4.11 Output circuit
7 - 1.4.12 Power source
7 - 1.4.13 Terminals.
7 - 1.4.14 Welder
7 - 1.4.15 Welding
9 - SECTION 2. ELECTRICAL REQUIREMENTS
9 - 2.1 CONNECTION TO ELECTRICITY SUPPLY.
9 - 2.2 OUTPUT CIRCUIT, CONDUCTORS, LEADS AND THEIR CONNECTIONS.
9 - 2.2.1 General.
9 - 2.2.2 Voltage drop.
9 - 2.2.3 Electrode lead.
9 - 2.2.4 Electrode conductor.
9 - 2.2.5 Work lead and work conductor.
10 - 2.2.6 Connections.
10 - 2.3 EARTHING.
10 - 2.4 PROTECTION OF TERMINALS.
10 - 2.5 MARKING OF TERMINALS.
10 - 2.6 POWER SOURCES.
10 - 2.6.1 Control.
10 - 2.6.2 Supply to output circuit.
10 - 2.6.3 Maximum open-circuit voltage.
10 - 2.6.4 High-frequency arc initiating equipment.
11 - 2.6.5 Surge injection.
11 - 2.7 POWER SOURCE ANCILLARIES.
11 - 2.7.1 Electrode holders.
11 - 2.7.2 Plasma torches.
11 - 2.7.3 Wire feeders.
11 - 2.7.4 Use of multiple ancillary items.
11 - 2.8 INSPECTION AND MAINTENANCE.
11 - 2.8.1 Power source.
11 - 2.8.2 Accessories.
12 - SECTION 3. GENERAL PRECAUTIONS
12 - 3.1 GENERAL.
12 - 3.2 WORKING IN CONFINED SPACES.
12 - 3.3 PARTICULAR HAZARDS WITH PLASMA ARC PROCESSES.
12 - 3.4 DE-ENERGIZATION OF OUTPUT CIRCUIT.
12 - 3.5 ELECTRODES.
12 - 3.6 ELECTRODE HOLDERS AND TORCHES.
12 - 3.7 CARE OF LEADS AND CONNECTIONS.
13 - SECTION 4. PERSONNEL SAFETY PRECAUTIONS
13 - 4.1 GENERAL.
13 - 4.2 POWER SOURCES.
13 - 4.2.1 General.
13 - 4.2.2 Transformer type.
13 - 4.2.3 Plasma arc welding type.
13 - 4.2.4 Plasma arc cutting type.
13 - 4.3 ELECTRIC SHOCK.
13 - 4.3.1 General.
13 - 4.3.2 The severity of electric shock.
13 - 4.3.3 The magnitude of current flowing through the body.
15 - 4.3.4 The path of the current through the body.
15 - 4.3.5 The duration of the shock.
15 - 4.3.6 The type of voltage supply, a.c. or d.c.
15 - 4.3.7 The reaction to shock.
15 - 4.4 PRECAUTIONS.
15 - 4.4.1 General.
15 - 4.4.2 Connecting to the electricity supply.
15 - 4.4.3 When working.
15 - 4.4.4 Connecting the output circuit.
15 - 4.4.5 Cable connections.
16 - 4.5 WORKING IN CONFINED SPACES.
16 - 4.6 WORKING IN WET CONDITIONS.
18 - 4.7 PACEMAKERS.
18 - 4.8 HELMETS, HANDSHIELDS, GOGGLES AND FACE MASKS.
19 - APPENDIX A - TYPICAL OUTPUT CIRCUIT SAFETY SWITCH
20 - APPENDIX B - RESCUE AND RESUSCITATION IN THE CASE OF ELECTRIC SHOCK
20 - B1 GENERAL.
20 - B2 RESCUE.
22 - B4 THE MANAGEMENT OF VICTIM OF ELECTRIC SHOCK.
22 - B4.1 General.
22 - B4.2 Management of a conscious person.
22 - B4.3 Management of an unconscious person.
22 - B4.4 Management of electrical burn.
22 - B5 CHECKING OF AIRWAY.
22 - B6 CHECK BREATHING.
22 - B6.1 General.
23 - B6.2 Victim not breathing.
24 - B7 CIRCULATION.
25 - B8 RATIO OF VENTILATION TO COMPRESSION.
25 - B8.1 One rescuer.
26 - B8.2 Two rescuers.
26 - B9 CHECK PROGRESS.
27 - B10 THE NEED FOR SUPERVISED TRAINING AND RETRAINING.
27 - B11 COMMUNITY SOURCES OF INSTRUCTION.
29 - APPENDIX C - PRECAUTIONS WHEN CONNECTING TO ELECTRICITY SUPPLY
29 - C1 GENERAL.
29 - C2 INSTALLATION OF SINGLE-PHASE POWER SOURCES ON TWO-WIRE A.C. SUPPLY CIRCUITS.
30 - C3 D.C. WELDING CIRCUITS.
30 - C4 INSTALLATIONS ON THREE-PHASE SUPPLY CIRCUITS.
33 - APPENDIX D - EXAMPLES OF FATAL ELECTRICAL ACCIDENTS
33 - D1 GENERAL.
33 - D2 BOILER WELDING.
35 - D3 WORKING ON BOARD A SHIP.
36 - D4 WELDING OUTDOORS.
37 - D5 PULLING A CABLE.
37 - D6 FATAL ELECTRICAL ACCIDENT INVOLVING MAINS VOLTAGE.

Applies to the prevention of electric shock to welders. Sets out the requirements for safety of circuit wiring on power sources for welding and allied processes and the precautions to be taken when operating such power sources. Includes plasma arc power sources and reference to particular hazards due to their high open-circuit voltages. The appendices illustrate and describe the correct method of connection between adjacent power sources to minimize the likelihood of electric shock across adjacent power source leads. Examples of recorded fatal accidents are included and procedures for rescue and resuscitation in the case of electric shock are described and illustrated.

This Standard sets out requirements for the prevention of electric shock and the minimizing of certain associated hazards in arc welding and allied processes. The Standard describes the practices and safeguards which should be adopted by welders and the connections for alternating and direct current power sources, together with the requirements for any ancillary equipment.It also gives examples on how shocks may be received and the action to take in the event of a welder receiving an electric shock.NOTE: Other aspects of welding safety are covered in other Standards.

Under Revision see DR 01334