ELECTRICAL SAFETY
ELECTRICAL SAFETY AT
CONSTRUCTION SITE
ELECTRICAL SAFETY
NATIONAL ELECTRICAL SAFETY
WEEK
“Avoid Loose Wires – Prevent Electrical
Fires”
ELECTRICAL SAFETY
WORKING WITH ELECTRICITY MAY BE DANGEROUS
IF:
SOP’s not
followed
Safety
precautions not
taken care off
Elect safety vids\Elect safety 2.mp4
Overlooking
hazards
Improper PPE
ELECTRICAL SAFETY
SOME COMMON ELECTRICAL HAZARDS AT CONSTRUCTION
SITE
Poor Cable
Management
Power
Supply
Boards
Earthing
• Loose Wires
• Poor Cable
laying
• Temp Cable
Joints
• Cable
Terminations
• Welding
rectifier
• DG Sets
ELECTRICAL SAFETY
POOR CABLE MANAGEMENT
➢ Elect safety vids\Elect safety 4.mp4
ELECTRICAL SAFETY
POWER SUPPLY BOARDS /
JOINTS
ELECTRICAL SAFETY
EARTHING
Elect safety vids\Elect safety 3.mp4
ELECTRICAL SAFETY
UNSAFE
PRACTICES
ELECTRICAL SAFETY
UNSAFE PRACTICES
Elect safety vids\Elect safety 5_lock Out.mp4
ELECTRICAL SAFETY
UNSAFE PRACTICES
ELECTRICAL SAFETY
FOR SAFE ELECTRICAL WORKS
ELECTRICAL SAFETY
STANDARD OPERATING PROCEDURE
✓ Specific job-related procedure to be defined clearly
✓ Electricians must be educated / trained on job
✓ SOP’s to be followed
✓ Specific job must be mentioned on the work permit
✓ Job related hazards to be identified and maintained in Job safety Plan
✓ Lock Out / Tag Out
FUNDAMENTALS OF EARTHING
PERSONAL PROTECTOVE EQUIPMENT (PPE)
Elect safety vids\Elect safety 6.mp4
Contd.
ELECTRICAL SAFETY
ELECTRICAL SAFETY DURING
MONSOON
Contd.
ELECTRICAL SAFETY
✓ All DG Sets, welding rectifiers, electrical concrete mixers, grinders etc.
should be connected with earthing system and checked for continuity on
daily basis before commencement of job.
✓ Make sure that any electric equipment should not come under
submergence.
✓ Ensure all outdoor electrical equipment are provided with suitable
canopies / covers.
✓ Ensure all earthing connections have been checked for continuity.
✓ Ensure cable glands have been checked for their soundness.
✓ Ensure temporary power connection (switchboard / panel) are provided
ELECTRICAL SAFETY
✓ Ensure electrical Insulation rubber mats are in place.
✓ Ensure use of necessary PPE by electricians and all operating
personnel.
✓ Ensure proper shed/ canopy for rain protection for the electrical
panels, automation equipment etc. has been provided.
✓ Ensure outdoor terminal boxes/ junction boxes/ push button
stations, pillar box, distribution boards etc. should have proper
sealing gaskets to prevent short circuit due to entry of rainwater.
✓ Ensure the emergency DG set is in working condition. Keep
sufficient stock of fuel for running of DG.
ELECTRICAL SAFETY
DO’s & DON’T’s
Contd.
ELECTRICAL SAFETY
DO’s:
✓ Operate / Maintain the panel with valid permit / information.
✓ Strictly adhere to PPE’s as mentioned in the permit.
✓ Discharge the static charge present on inductive / capacitive circuits on isolated
equipment prior to commencement of work.
✓ Follow system LOTO strictly as per LOTO SOP.
✓ Power restoration to be done as per power restoration procedure.
✓ Before working on any circuit or apparatus, make sure that the controlling switches
are open and locked (AC/DC Supply of spring charged is de-energized).
ELECTRICAL SAFETY
DO’s:
✓ Housekeeping to be done after work completion.
✓ Read the Single Line Diagram and wiring – know your switchboard.
✓ Inspect the tools prior to usage.
✓ Check that electrical connections are tight & dust free.
✓ Temporary supply should be given from proper as per load.
✓ Report any abnormality promptly to authorised personnel.
ELECTRICAL SAFETY
DONT’s:
✓ Do not do operation / maintenance on the panel without valid permit / information.
✓ Do not remove LOTO without closure of electrical isolation permit.
✓ DO not reset relay flags without detailed inspection.
✓ DO not keep loose uninsulated wires in panel or in substation.
✓ Do not wear loose clothing, metal watch straps, bangles or finger rings while working.
✓ Do not use a power tool that smokes, sparks, smells or shocks.
ELECTRICAL SAFETY
LOCK OUT - TAG OUT
Contd.
ELECTRICAL SAFETY
Procedure to carry Lock Out Tag Out is as follows:
✓ Identify the feeder/contactor as mentioned in the Electrical Isolation Permit (EIP)
corresponding to the equipment which has to be electrically isolated.
✓ Strictly adhere to the PPEs as mentioned in the EIP.
✓ Follow the procedure filled in EIP to isolate the equipment.
✓ Once the equipment is electrically isolated, lock out the corresponding feeder /
contactor and pit the electrical isolating tag mentioning all the relevant details. Key
and the trailing part of isolation tag is to be kept with the authorized person.
✓ Inform all nearby / concerned personnel about the isolation.
✓ Once the equipment is isolated, locked and tagged, inform issuer department so that
the maintenance activity can be carried out.
ELECTRICAL SAFETY
Procedure for restoration of electrical supply / re-energization of equipment:
✓ Identify the feeder / contactor for which electrical isolation is to be removed.
✓ Inform everyone in work area that the isolation is being removed.
✓ De-lock the feeder/contactor. Ensure proper housekeeping, removal of tools tackles and make
sure that the system under maintenance is fully assembled.
✓ Re-energize the equipment by following the isolation procedure in reverse manner.
✓ Fill the details of tagging out as mentioned in the second part of electrical isolation tag.
ELECTRICAL SAFETY
EARTHING
Contd.
FUNDAMENTALS OF EARTHING
✓ What is Earthing
✓ By Earthing, we mean making the Physical & Electrical
connection to the General Mass of Conducting Earth / earth
Circuit.
Contd.
IMPORTANCE OF EARTHING
✓ Safety Provided by Earthing
✓ Safety of Life
✓ Safety of Property / Installation
✓ Safety & Stability of Power System
WHY EQUIPMENT EARTHING
Equipment earthing provides safety of life & property by:
✓ Ensuring freedom from dangerous electric shock voltage exposure
to person present in the area.
✓ Ensuring current carrying capability both in magnitude & duration
adequate to accept the ground fault current without creating a
fire or explosive hazard.
✓ Ensuring the proper return path for earth fault currents & hence
better performance of the electrical system.
HOW TO CARRY OUT EQUIPMENT EARTHING
✓ As direct as possible.
✓ By ensuring equipotential bonding between all simultaneously
accessible exposed & extraneous conductive parts.
EQUIPMENT EARTHING – BASIC RULES
✓ Earth All exposed and extraneous conductive parts.
✓ Earth as directly as possible with minimum impedance.
✓ Simultaneously accessible exposed and extraneous conductive
parts must be connected to the same earth electrode / earth
grid.
✓ Earth by two separate and distinct connections with earth for
operating voltage above 240AC.
EQUIPMENT EARTHING – BASIC RULES
TYPICAL EARTH ELECTRODE : IS 3043
EARTHING BASICS
EARTH VS UN EARTH
EARTHING BASICS
ELECTRIC SHOCK
EARTHING BASICS
EFFECT OF CURRENT
EARTHING BASICS
IS 3043 ON EQUIPMENT GROUNDING
EARTHING BASICS
TOUCH AND STEP POTENTIAL
EARTHING BASICS
EARTHING BASICS