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Over Head Electrical Hazards

Tutorial on electrical systems for telecommunications
by

Morgan Wotherspoon

on 26 February 2015

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Transcript of Over Head Electrical Hazards

Over Head Electrical Hazards
Plan your Work and Plan for the Circle of Safety
Three steps to be more Aware in our daily safety practices
Approach Distances
"Safety on the job is achieved only through vigilance, hard work and the proper training..." IBEW President Edwin D. Hill

"I am increasingly amazed by the seemingly growing number of incidents that involve the circumventing safety and other workplace rules by certain numbers of our members." IBEW Local 47 Pat Lavin
Pre-Job Survey on Joint use poles
Upon your arrival:
Perform and document the Pre-Job Hazard Survey
Perform an inspection of the line and survey surroundings for hazards
Test all potential electrical hazards using your voltage detector
Check your T-Zone
Goals:
Identify potential electrical hazards overhead
Create a working knowledge of electrical equipment in the field
Explain the basic goals of electrical protection
Explain the minimum clearance and approach distances between power and telephone on a building or pole at the first point of contact
Basic Precautions
Verizon Work Practices and Procedures
Avoid creating current paths through the body. Minimize the area of contact.
Keep the area of contact dry. Moisture reduces the resistance and tends to enlarge the area of contact
Avoid bare-hand contact
Overhead Powerline Hazards
Powerlines are usually not insulated
Half of all electrocutions are caused by direct worker contact with energized powerlines
In the past 80% of all lineman deaths were caused by direct contact with the bare hand
Today, most electrocutions involving overhead powerlines are caused by failure to maintain proper approach distances
Recognize
Discuss plan with co-workers
Pre- Job Survey and Hazard Recognition checklist
Evaluate
Identify all possible hazards
Control the Work Site
Create a safe environment
•Electricity especially high voltage can be deadly if not properly controlled
•Working near electric lines & equipment direct and indirect contact must be avoided.
–Direct contact is contact with the electric facility with any part of the body or equipment
–Indirect contact is when any part of the body or equipment is “too close”to electric facilities where arcing or electric flow is permitted
•Utilities have established areas on poles where the various service lines electric, telephone, & cable lines are installed.
•The upper portion of the pole is reserved for electric facilities. Generally, with the highest voltage lines being at the top of the pole.
•A neutral space separates the electric power lines & equipment for communication & other non-electric utilities on utility poles
Electric Power Space
Equipment is installed on poles in the following order from the top down:
•Primary electric wires( top of pole) 2,400 to 69,000 volts
–(wire bare or weather coating only –not insulated)
•Secondary electric wires for local use less than 600 volts (usually 120/240)
–(wire bare or weather coating only –not insulated)
•Fiber Optics (can be installed in the power space or communications space)
•Fire Alarm
•Cable -TV (CATV)
•Telephone Lines
SAFETY -IF YOU CAN’T IDENTIFTY WHERE THE WIRE IS CONNECTED ON THE POLE DO NOT TOUCH!
Supply Voltage
Verizon Practices and Polices
It is imperative that employees be able to identify supply voltages and take additional precautions when exposed to such voltages.
Equipment that you will encounter on our poles
Review of Power Supply Voltages:
Phase to Phase Voltage
Secondary distribution-750 volts or less
Primary distribution-2200 to 34,500 volts
Subtransmission- 26,00 to 69,000 volts
Phase to Ground Voltage
Primary distribution- 1270 to 20,000 volts
Subtransmission- 15,000 to 40,000 volts
Can be assured:
Power conductors immediately above telephone facilities, if attached to spool-type insulators on a metal bracket, in a twisted pair configuration, is usually secondary service, with voltages less than 750 volts.

Crossarms are usually associated with primary voltages. It is quite common to have a primary distribution supply above the secondary distribution with a voltage range of 2200 to 34,500 volts.
Technicians can estimate the voltage of power by observing the size and type of insulator, voltage markings on transformer, position of supply conductors on a pole, etc.
Take the time necessary to evaluate your worksite, wear the proper PPE, and perform your job safely. Your family wants you home and the company wants you on the job in the morning
Single Phase Primary
Power Company
No Verizon employee is ever permitted to raise an aerial lift to a height that

exceeds the level of where the employee’s chest exceeds the height of

where Verizon plant is located when power lines are present without prior,

job specific authorization from supervision. This directive applies to all

aerial work operations including pole and mid-span work locations and

must be documented by management in accordance with this directive.

Verizon Maximum Working Height Policy
Full transcript