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LABORATORY ELECTRICAL SAFETY

LABORATORY ELECTRICAL SAFETY. Discussion topics: Electrical shock hazards Identifying hazards Research apparatus/ systems Proper emergency procedures Electricalfor Labs Rev.9-2000.ppt. Electrical Shock Hazards. Primary Hazards Electrical shock Flash burns Secondary Hazards

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LABORATORY ELECTRICAL SAFETY

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  1. LABORATORYELECTRICAL SAFETY • Discussion topics: • Electrical shock hazards • Identifying hazards • Research apparatus/ systems • Proper emergency procedures • Electricalfor Labs Rev.9-2000.ppt

  2. Electrical Shock Hazards • Primary Hazards • Electrical shock • Flash burns • Secondary Hazards • Fall from heights • Injury from mechanical hazards • Burns from electrical fire

  3. Even Low Voltages Can Kill! Severity of shock depends on: • Current flowing through body • Duration of current flow through body • Pathof current through body Ex: Hand contact w/ 120V (hand-to-hand pathway) I = 120V / 2000 ohms = 0.06 amperes = 60 mA (w/ wet hands, resistance is decreased)

  4. Effects of Electrical Current Reference: Lawrence Livermore National Laboratory-- Document HS5220-W

  5. Identifying Hazards:Outlets, Facility Wiring • Avoid overloading electrical outlets • Ensure to guard from exposed wiring or energized parts • Label all circuit-breaker switches • Leave at least 36” clearance in front of electrical panels • Ensure proper use of extension cords • NEVER repair/ modify facility electrical wiring • Contact a qualified licensed electrician to perform work.

  6. Identifying Hazards:Laboratory Equipment • Inspect tools/ equipment before use • Protective measures: • 3-prong plugs • Double insulation on handheld tools • GFCI-type outlets • For any tools/ appliances that generate heat (soldering irons, hot plates, etc.), unplug when not in use

  7. Research Apparatus/ Systems:Design Safety • Incorporate into the design: • Protective devices • Proper grounding • Proper equipment enclosures • Warning signs and labels • Systems safety design should be reviewed and approved by a qualified professional.

  8. Research Apparatus/ Systems:Working with Electrical Systems Only knowledgeable and qualified persons shall work on electrical circuits/systems BASIC RULES: • Properly de-energize systems before starting work (should include lockout and tag) • Never work alone • Resist “hurry-up” pressures • Know local emergency procedures

  9. Research Apparatus/ Systems:High Hazard Operations Personnel involved in a high hazard operation must use safe work procedures (a written safety procedure is required,SOP*). High hazard operations include, but are not limited to work involving: • Energized circuits • Higher voltage systems (> 240 V) • Capacitors (>10 J stored at > 50V) (*Standard Operating Procedure)

  10. Response to Electrical Shock • Protect yourself • Call 9-911 • Warn others of hazard • Shut off power immediately • Move victim to safety if safe to do so • Give necessary first aid IF TRAINED • Notify supervisor

  11. Electrical Fire • Don’t use water or touch burning objects • If possible, unplug or turn off power • Activate fire alarm and call 9-911 • If small fire and within your ability, use CO2 or ABC fire extinguisher to put out. • Ensure that personnel have taken fire extinguisher training from EH&S-- Fire Safety Program (723-0609)

  12. Basic Electrical Safety Tips • Understand the hazards of your task. • Understand the equipment and circuit functions. • Make sure that you are trained to perform the task. • Don’t be afraid to ask for help.

  13. Remember • Even low voltages will kill • Electricity does not discriminate-- Even the most experienced are at risk! • For more information, contact EH&S– • Occupational Health & Safety Program: • 725-3209 • lsteng@forsythe • Stanford Fire Marshal’s Office • 723-0609 • jleung@stanford.edu

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