MABAS Division 10 - Com E d Program 1 Electrical Safety Reference: The Power of Reference: The Power of Training Training Electrical Safety Electrical Safety Commonwealth Edison Commonwealth Edison Company Company
Mar 26, 2015
MABAS Division 10 - Com Ed Program
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Electrical Safety
Reference: The Power of TrainingReference: The Power of Training
Electrical SafetyElectrical Safety
Commonwealth Edison CompanyCommonwealth Edison Company
MABAS Division 10 - Com Ed Program
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Knowledge Objectives
The Firefighter shall be able to:– Explain the basic function of overhead
wires and equipment– Identify Type A and S Meters– Explain hazards of step potential, touch
potential, vehicles in contact with energized lines, and downed wire movement
MABAS Division 10 - Com Ed Program
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Performance Objectives
Given the proper tools and equipment, the firefighter shall be able to:– Remove residential meters– Conduct low voltage electrical tests– Cut service entrance “drip loops”
MABAS Division 10 - Com Ed Program
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Introduction
This program is designed to train firefighters in properly removing meters or cutting drip loops to disconnect service to a residence that is on fire.
ComEd prefers that the electrical service be left intact
Call ComEd for service disconnects
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If the Incident Commander decides the service must be disconnected immediately:
Call ComEd Open buildings main disconnect Remove meter if necessary Cut drip loops when meter cannot be
removed Utilize Voltage Tester to verify power
disconnect
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Firefighters are only to remove the meter to the residence that is
on fire
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Transmission & Distribution System
Power Plants Switchyard Transmission Substation Distribution Transformers Residential Service
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Transmission Pole Configuration
Highest voltage is usually located at top of pole.– Other voltages may be present on pole also
Transmission Poles Distribution Poles Secondaries Cable and Phone may also be present
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MABAS Division 10 - Com Ed Program
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Residential Meters
Removable (type S) Non Removable (type A)
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MABAS Division 10 - Com Ed Program
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MABAS Division 10 - Com Ed Program
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MABAS Division 10 - Com Ed Program
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Downed Wires
Voltage Gradient is present– Consider the Step Potential
Guarding wires and exposed live electrical equipment
Principles for guarding wires, and electrical equipment
Precautions Rescue Procedures
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MABAS Division 10 - Com Ed Program
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All cables & wires must be treated as energized until proven
dead !
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Service Wires
Identifying Service Drop Cable– Open Wire construction– Triplex
Identifying telephone and cable wires
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When service is to be interruptedFollow these steps:
Don protective equipment Open Mains if possible Remove meter if necessary Cut the tap (drip loops) at the house
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Safety Equipment Needed
Rubber glove set– Leather over rubber
Eye/Face protection Full Protective clothing recommended Voltage Tester Meter Cover Hotstick
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Rubber gloves and protectors
Precautions Testing and Inspecting Exchange
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Live Line Tool
Also known as Hotstick– Inspect for damage prior to use– Tool may be used for cutting drip loops
only!!
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Low Voltage Tester
Tests for de-energized circuits Tests for secondary voltage Checking & using
– Condition– Operation
Interpreting the tester reading
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Removing a Type S Meter Protective Clothing required Open disconnect if possible Remove meter
– Cut meter seal with wire cutters– Remove meter retaining ring– Contact top outer edge with a downward and
outward angle– Grasp meter with two hands and pull straight
out. Do not twist meter while removing
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Steps for Cutting Drip Loops
Identify the drip loop at building Identify the neutral wire first DO NOT
CUT X and Y conductors should be cut
– Separate two parts from each other Cut neutral wire Avoid cutting support wire if present
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MABAS Division 10 - Com Ed Program
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Summary
This program was designed to aid the firefighter on the scene of a fire or emergency to correctly and safely remove electrical hazards.
WHEN IN DOUBT, WAIT FOR ComEd TO ARRIVE ON THE SCENE
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Written Exam and Practical
Take 15 question written examination Complete practical evaluation
– Cut Drip loop connection– Identify type A and S meters
Remove type S meter