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Electrical Safety Reference: The Power of Training Electrical Safety Commonwealth Edison Company MABAS Division 10 - Com Ed Program 1 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 2 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 3 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 MABAS Division 10 - Com Ed Program 4 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 MABAS Division 10 - Com Ed Program 5 Firefighters are only to remove the meter to the residence that is on fire MABAS Division 10 - Com Ed Program 6 Transmission & Distribution System Power Plants Switchyard Transmission Substation Distribution Transformers Residential Service MABAS Division 10 - Com Ed Program 7 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 MABAS Division 10 - Com Ed Program 8 MABAS Division 10 - Com Ed Program 9 Residential Meters Removable (type S) Non Removable (type A) MABAS Division 10 - Com Ed Program 10 MABAS Division 10 - Com Ed Program 11 MABAS Division 10 - Com Ed Program 12 MABAS Division 10 - Com Ed Program 13 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 MABAS Division 10 - Com Ed Program 14 MABAS Division 10 - Com Ed Program 15 All cables & wires must be treated as energized until proven dead ! MABAS Division 10 - Com Ed Program 16 Service Wires Identifying Service Drop Cable – Open Wire construction – Triplex Identifying telephone and cable wires MABAS Division 10 - Com Ed Program 17 When service is to be interrupted Follow these steps: Don protective equipment Open Mains if possible Remove meter if necessary Cut the tap (drip loops) at the house MABAS Division 10 - Com Ed Program 18 Safety Equipment Needed Rubber glove set – Leather over rubber Eye/Face protection Full Protective clothing recommended Voltage Tester Meter Cover Hotstick MABAS Division 10 - Com Ed Program 19 Rubber gloves and protectors Precautions Testing and Inspecting Exchange MABAS Division 10 - Com Ed Program 20 Live Line Tool Also known as Hotstick – Inspect for damage prior to use – Tool may be used for cutting drip loops only!! MABAS Division 10 - Com Ed Program 21 Low Voltage Tester Tests for de-energized circuits Tests for secondary voltage Checking & using – Condition – Operation Interpreting the tester reading MABAS Division 10 - Com Ed Program 22 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 MABAS Division 10 - Com Ed Program 23 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 MABAS Division 10 - Com Ed Program 24 MABAS Division 10 - Com Ed Program 25 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 MABAS Division 10 - Com Ed Program 26 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 MABAS Division 10 - Com Ed Program 27