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QEW 1 / 2 / 3 Job Safety Plan

Electrical Safety
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Time / Date: 3/24/2026 12:44:17
JSP ID: 4649
Scope of Work: Perform LOTO and ZVV for personnel to troubleshoot inside power supply.

General Information

Work Order
None
Building
88
Person in Charge
Scott Small
Lead / Supervisor
Other
Logged Email
smsmall@lbl.gov
Division
Other

Work Planning

Modes of Work
☑ Mode 1 - LOTO & Zero Voltage Verification
QEW Level
QEW 2
Second Person Requirement
Standby Person
Second Person Identified
J. Peterson
Other Participants
None
Affected Persons Notified
Yes

System / Equipment

Switching
Non-Hazardous Switching
Panel / Equipment ID
Magwatt M41/42 Power Supply
System Information Review
☑ Single Line Drawing
☑ Arc Flash Labels
Control of Hazardous Energy
Complex LOTO w/ RI
Equipment Condition
☑ Properly installed
☑ Properly maintained
☑ All doors and covers closed and fully latched
☑ No signs of impending failure
☑ Not energizing equipment for the first time
☑ or after electrical repair

Sequence of Job Steps

List basic sequence of steps from start to finish
De-energize, perform LOTO procedure P4H-4.

Control of Work Area

Minimum Approach Boundary
LAB = 42", RAB = 12", AFB = 5"
Barricade Tape / Attendant
Warning - Orange

Shock Risk Assessment

System Voltage
277/480 V ac
Limited Approach Boundary
42 inches
Restricted Approach Boundary
12 inches
Will the hands enter the RAB
Yes
Voltage Glove Class
0
Will any other part of the body enter the RAB
No

Arc Flash Risk Assessment

Incident Energy
0.17 cal/cm2
Arc Flash Boundary
5"
Working Distance
18 inches
Arc Flash PPE Level
Minimum PPE for Electrical Work
Incident Energy Reduction Measures
0

Capacitor Hazards

Capacitor Bus Voltage
679 VDC and 130VDC
Capacitor Total Stored Energy (Joules)
106J and 557J, respectively.
Discharge Wait Time (Minutes)
1 minute

Emergency Response Plan

Nearest Landline Location
BGS Shack
Emergency Number to Call
911
Sufficient Cell Phone Signal
Yes
Clear Exit Path
Yes
AED Location
Portable at job site.
Fire Extinguisher Location
Next to RE-110 disconnect (moved to work boundary)
Contact Release Method Available and Tested
Voltage gloves

Environmental Conditions

Does the environment present additional hazards that should be addressed?
None

Error Precursors

Task Demands
Work Environment
Individual Capabilities
Human Nature
Error Precursor Mitigations
None

PPE Inspections

☑ Safety glasses (ANSI Z87)
☑ Arc-rated clothing (flash suit
☑ daily wear) including face shield
☑ balaclava
☑ hood.
☑ Rubber insulating gloves and leather protectors
☑ Non-melting footwear that fully covers the feet
☑ Removal of conductive articles
☑ Insulated tools
☑ Multimeter and other electrical test instruments

Notes / Other

Perform Job Briefing

PIC Conducts the Job Briefing. Cover all the contents of the Job Safety Plan.

A Job Briefing at a minimum must include:
  1. Detailed Scope of Work
  2. Shock and arc flash hazards for each task
  3. Controls to mitigate the hazards (procedures, precautions, energy source controls, PPE requirements)
  4. Work area controls (barricades, signs, attendants)
  5. Emergency Response Plan
Rev 2026.03.17.1
Form Content and Feedback Contact: Michael Rose -- mvr@lbl.gov