Review basic safety precautions

1. Review basic safety precautions MARCOM

2. Safe Working Practices • Use good common sense. • Never operate or repair equipment unless qualified to do so. • Never intentionally take an electric shock.

3. SAFE WORKING PRACTICES • Only use proper safety checked portable/mobile equipment. (power tools, test equipment, etc…) • Never destroy or mutilate identification markings.

4. SAFE WORKING PRACTICES • Never hang or secure any object on cable runs or electrical equipment. • Never leave electrical/electronic enclosures open except while performing maintenance. • When discharging capacitors, use an approved face shield, rubber gloves, and an approved shorting probe.

5. WORKING ON DE-ENERGIZED CIRCUITS

6. WORKING ON DE-ENERGIZED CIRCUITS • Secure all sources of power to the circuit. • Tag “out of Service”. • Remove all fuses. • With an approved shorting probe, discharge all capacitors to ground.

7. WORKING ON DE-ENERGIZED CIRCUITS cont. • Using a voltage tester of the proper range and frequency, ensure the circuit is entirely de-energized.

8. WORKING ON ENERGIZED CIRCUITS

9. WORKING ON ENERGIZED CIRCUITS • Work on energized circuits only when absolutely necessary. • The Commanding Officer’s permission is required to work on energized equipment/circuits.

10. WORKING ON ENERGIZED CIRCUITS cont. • Never work alone! Additionally, if possible, the person not working on the circuit should be trained in basic first aid. • Make sure the equipment being worked on is properly grounded. • Ensure that you have sufficient lighting.

11. WORKING ON ENERGIZED CIRCUITS cont. • Use approved rubber matting to insulate the work area. • Wear approved rubber gloves. • Remove all personal conductive material prior to commencing work, i.e., rings, watches, chains, jewelry, etc…

12. WORKING ON ENERGIZED CIRCUITS cont. • Use insulated tools. • Wear dry clothing and avoid damp locations. • If possible, work with one hand only.

13. FACTORS DETERMINING THE SEVERITY OF SHOCK ON THE BODY

14. SHOCK ON THE BODY. • The amount of current flowing through the body determines the severity of the electrical shock. • .001a/1 milliamp - can be felt. • .01a/10 milliamps – loss of muscle control. • .1 a/100 milliamps – usually fatal.

15. SHOCK ON THE BODY cont. • Body resistance and the difference of potential determine the amount of current flow. • 50% of all fatal accidents involving electricity are caused by 120 volts or less. • Any Voltage 30 volts or greater is considered high voltage by the Department of Defense.

16. SYMPTOMS OF ELECTRICAL SHOCK

17. SYMPTOMS OF ELECTRICAL SHOCK • Skin – pale, cold, and moist. • Breathing – shallow and irregular. • Eyes – vacant, lackluster, and dilated. • Pulse – weak and rapid.

18. SYMPTOMS OF ELECTRICAL SHOCK cont. • Muscle spasms. • Shock can cause respiratory arrest (victim is alive but not breathing) and cardiac arrest (loss of heartbeat).

19. REQUIRED FIRST AID

20. REQUIRED FIRST AID • The first step is to properly remove the victim from the source. • Call for assistance. • Determine if the victim is breathing; if not, perform rescue breathing.

21. REQUIRED FIRST AID cont. • Determine if the victim has a heartbeat; if not, perform External Chest Compressions. • If both respiratory and cardiac arrest have occurred, perform Cardiopulmonary Resuscitation (CPR).

22. ANY QUESTIONS • Basic Electrical Safety

23. ESD Movie:The Invisible Threat(Full-Screen Format)

24. ESD Movie:The Invisible Threat(Full-Screen Format)

25. Electrostatic Discharge Control • Nature of Static Electricity • Static electricity is an electrical charge formed when two different materials are rubbed together or separated. • This STATIC CHARGE is created when you: • Walk across a carpet • Comb your hair • Remove articles from a plastic envelope • Take off a sweater • Rub your clothes against or separate them from a normal chair

26. Electrostatic Discharge Control • Prime Sources of Charges • Work Surfaces • Floors • Clothes • Chairs • Packaging and handling • Cleaning, test, and repair areas

27. Electrostatic Discharge Control • Types of ESD failure • Intermittent or upset • Failures occurring when equipment is in operation • Loss of information • Temporary distortion of equipment function • Catastrophic or hard • Failures occurring any time • Failure may not occur until some time after exposure to ESD, (latent failure)

28. Electrostatic Discharge Control • Protected Areas • ESD Protective Equipment • Personnel Wrist Straps and Cords

29. Electrostatic Discharge Control • ESD Protective Materials • Packaging • Reclosable bag or material that has a pink or blue poly antistatic bubble inside layer with ESD barrier material as an outside layer or • Initial bag or wrapped in pink poly or blue antistatic material and then packed in ESD barrier bags.

30. Electrostatic Discharge Control • Grounded Workbenches

31. Handling ESD Devices • Basic Rules • Presume all components are susceptible to ESD damage • Never touch a sensitive component unless you are wearing a wrist strap • Never transport or store ESD items outside of ESD protective packaging • Never have plastic articles within 2 feet of ESDS items

32. Handling ESD Devices • Operating Procedures • Hands must be clean • Wrist strap and cord is to be worn at all times when working at any ESD workbench • Keep work area clean • No ordinary plastic items, cups, or food in or around the work area • Hold PCB by the edges and do not touch contacts

33. Electrostatic Discharge Control • Warning Labels

34. ANY QUESTIONS • ESD Control