Refresher: Electrical Safety PPE

1
Take 5 for Safety

• Refresher Electrical Safety PPE
• Collider-Accelerator Department
• 3-17-2009

2
Electrical Safety

• Serious accidents can happen to the most
  experienced electrical workers
• About 10 electrical workers killed each week due
  to electrical accidents in US
• 90 of all electrical injuries happen to people
  with 4 to 8 years job experience
• If you witness a person receiving an electric
  shock, then do not become a second victim
• If possible, de-energize the circuit
• If available, use a non-conductive tool to
  disengage the worker from the live part
• Call x2222
• If trained, begin CPR if person is unresponsive

3
Exposure to Arc Flash

• 75 of all electrical injuries are burns
  resulting from arc flash and ignition of clothing
• More than 2000 electrical workers admitted to
  hospitals in US each year for severe electrical
  burns
• 15 result in amputation

4
Arc Flash Labels

• You will see warning labels that look like this

5
Arc Flash PPE and Hazard Categories

• 0
• long-sleeve shirt and long pants (non-melting
  materials)
• shirt fastened at wrists and neck
• leather gloves (leather palm, cotton back OK)
• safety glasses with side shields
• 1
• Hazard Category 0 PPE requirements
• Hard hat
• 2
• Cotton underwear fire-retardant long-sleeve
  shirt and fire-retardant long pants
• Hardhat with arc rated face shield
• Safety glasses
• All leather gloves
• Leather work shoes
• Hearing protection
• 3 and 4
• Hazard Category 2 PPE requirements
• Multilayer flash suit
• Flash suit hood

6
Other Arc Flash PPE Rules

• Minus 1 Rule
• Must remember PPE of lower category
• Electrical enclosure must be in good shape
• Memo/email from BNL QA Office
• Labels were not accurate at Building 555
• Ignore labels and use most conservative PPE
• Contradicts BNL Training and SBMS
• Knowledge-based decision on PPE
• Not used at C-AD

7
Shock Hazard PPE

• Working on or near energized circuits
• Voltage rated gloves
• Voltage rated tools
• Exceptions
• Less than 10 joules and
• Less than 50 V AC or DC
• Less than 5 milliamps AC
• Less than 10 milliamps DC and less than 1 kW
  power

8
Work Planning for a Soft Landing