Podcast
Questions and Answers
What is the minimum clearance required when working near TTC streetcar power lines?
What is the minimum clearance required when working near TTC streetcar power lines?
- 1.5 metres (5 feet)
- 2 metres (6.6 feet)
- 1 metre (3.3 feet) (correct)
- 1.8 metres (5.9 feet)
What is the consequence of contact with OCS transformers and vaults?
What is the consequence of contact with OCS transformers and vaults?
- Electrocution, severe burns and/or death (correct)
- No electrical hazard
- Minor electrical shock
- Electrical shock and burns
What is the general rule for all wires?
What is the general rule for all wires?
- Test them before touching
- Check with a supervisor
- Consider them live (correct)
- Assume they are dead
What is the minimum distance that TFS personnel must maintain from the OCS?
What is the minimum distance that TFS personnel must maintain from the OCS?
What should ground personnel avoid when near overhead wires?
What should ground personnel avoid when near overhead wires?
What is considered live at all times?
What is considered live at all times?
Who are allowed to use rubber/plastic protective cover up?
Who are allowed to use rubber/plastic protective cover up?
What is the TTC Emergency Contact Number?
What is the TTC Emergency Contact Number?
What is the recommended distance to maintain from all live or isolated wires, lower voltage wires, and equipment?
What is the recommended distance to maintain from all live or isolated wires, lower voltage wires, and equipment?
Why must aerial ladders, towers, platforms, and ground ladders be kept at a minimum distance from TTC overhead streetcar wires?
Why must aerial ladders, towers, platforms, and ground ladders be kept at a minimum distance from TTC overhead streetcar wires?
What is a common sign of electrical shock?
What is a common sign of electrical shock?
What can be a long-term effect of electrical shock?
What can be a long-term effect of electrical shock?
What should you do if you have experienced a physical hazard such as shock or electrocution?
What should you do if you have experienced a physical hazard such as shock or electrocution?
Study Notes
Safety Around OCS (Overhead Contact System)
- OCS overhead contact wires are considered live at all times and cannot be de-energized.
- Maintain a 1-meter (3 feet) limited approach boundary when working around the OCS.
Hazards and Risks
- Contact with OCS wires can cause electrical shock and electrocution.
- Electrical shock can lead to muscle spasms, difficulty breathing, headaches, burns, and numbness.
- Long-term effects of electrical shock include muscular pain, fatigue, headaches, and problems with nerve conduction and sensation.
- Electrical injury can also affect neurocognitive function, including mental processing speed, attention, concentration, and memory.
Safe Distances and Clearance
- Maintain a minimum distance of 1 meter (3 feet) from all live or isolated wires, lower voltage wires, and equipment (less than 750 VDC).
- Aerial ladders, towers, platforms, and ground ladders should remain at least 1 meter (3 feet) away from TTC overhead streetcar wires, cables, support wires, and associated attachments.
- Clearance of 3 meters (10 feet) should be maintained for non-TTC overhead wires.
Electrical Safety Guidelines
- Treat all wires as live at all times.
- Rubber/plastic protective cover-up should only be used by trained and approved TTC workers.
- Avoid contact with an aerial, tower, platform, or ground ladder if it contacts any overhead wires.
- Never provide a ground for an electrical circuit.
- Follow all electrical safety guidelines when deploying an aerial, tower, platform, or ground ladder around any overhead wires.
Emergency Contact
- The TTC emergency contact number is 416-393-3555.
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