Time / Date: 5/1/2025 16:21:56
JSP ID: 3696
Scope of Work: Bench top testing of experimental DC-DC power supply
Work Order:
Building: 90
Person in Charge: Ari Harding
Lead / Supervisor: Other
Logged Email: aharding@lbl.gov
Division: Other
QEW Level: QEW 2
Modes of Work: Mode 2 - Energized Diagnostics, Testing and Troubleshooting, Visual Inspection
Second Person Requirement: Standby Person
Second Person Identified: Carla Pinzon
List Other Participants: None
Affected Persons Notified: N/A
Switching: No Switching Required
Panel / Equipment ID: N/A
System Information Review: N/A
Control of Hazardous Energy: Cord & Plug LOTO
Equipment Condition:

Sequence of Job Steps

List basic sequence of steps from start to finish.

1. Connect CHROMA DC POWER SUPPLY, connect Chroma DC load 2. Cover with insulated sheeting for testing 3. Turn on power supply and load 4. Start testing at 50 vdc, 3 amps limit and troubleshoot as needed. 5. Ramp up voltage to 250 in steps of 50 volts if initial function test is successful.

Control of Work Area

Minimum Approach Boundary: 42 inches
Barricade Tape / Attendant: Danger - Red

Shock Risk Assessment

System Voltage: 250 vdc
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: Minimal cal/cm2
Arc Flash Boundary: N/A
Working Distance: No Arc Flash Hazard Present
Arc Flash PPE Level: Minimum PPE for Electrical Work
Incident Energy Reduction Measures: 0

Capacitor Hazards

Capacitor Bus Voltage: Not significant
Capacitor total stored energy (joules): N/A
Discharge wait time (minutes): N/A

Emergency Response Plan

Nearest Landline Location: Office next foor
Emergency Number to Call: 911
Sufficient cell phone signal? Yes
Clear exit path? Yes
AED Location: Lobby of B90
Fire Extinguisher Location: Hallway
Contact release method available and tested: Not needed

Environmental Conditions

Does the environment present additional hazards that should be addressed?

None

Error Precursors

Task Demands:
Work Environment:
Individual Capabilities: Unfamiliar with, or first time performing task
Human Nature:
Error Precursor Mitigations:

Proof of concept testing, take time and perform debugging at safe voltage levels

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 Breifing

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 2023.08.22.1
Form Content and Feedback Contact: Michael Rose -- mvr@lbl.gov