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Electrical Isolation

Electrical isolation is crucial for ensuring safety during maintenance by completely disconnecting circuits from power supplies. The process involves several key steps, including obtaining permits, isolating the supply, and verifying the absence of voltage. Proper isolation prevents electric shock and equipment damage, and it is essential to follow safety procedures to mitigate risks associated with unexpected re-energization.

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25 views2 pages

Electrical Isolation

Electrical isolation is crucial for ensuring safety during maintenance by completely disconnecting circuits from power supplies. The process involves several key steps, including obtaining permits, isolating the supply, and verifying the absence of voltage. Proper isolation prevents electric shock and equipment damage, and it is essential to follow safety procedures to mitigate risks associated with unexpected re-energization.

Uploaded by

venkatesankalavai3
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Electrical isolation is the process of de-energizing and completely disconnecting an electrical circuit or

piece of equipment from its power supply to ensure safety during maintenance, repair, or
troubleshooting. This involves using isolating devices, such as switches, to disconnect all conductors,
locking out these devices to prevent accidental re-energization, and verifying the absence of voltage
with appropriate testing equipment. Isolation prevents electric shock, burns, and equipment damage,
and it also serves to separate different parts of a system for functionality, safety, or to prevent electrical
noise from affecting other circuits

Purpose of Electrical Isolation

 Safety: To protect workers from electric shock and other hazards like arc flash by
ensuring no electrical current or voltage is present in the work area.

  Maintenance and Repair: To allow for safe, de-energized work on electrical equipment
and circuits.
  Functional Isolation: To separate different parts of a system so that a failure in one does
not affect another, or to isolate sensitive components from noise.

Key Steps in the Isolation Procedure

1. Permit to Work:

Obtain any necessary work permits before starting.

  Identify the Source(s):


Locate and identify the correct point of isolation for the specific equipment.
  Isolate the Supply:
Operate the isolating device to disconnect the equipment from the power source.
  Lockout/Tagout (LOTO):
Secure the isolating device with a lock and tag to prevent it from being re-energized while work
is ongoing.
  Verify Isolation (Prove Dead):
Use an approved voltage tester to confirm that the circuit is completely de-energized by testing
for voltage between the line, neutral, and earth conductors.
  Test the Tester:
Verify the voltage tester is working correctly by testing it on a known live source or a proving
unit before and after use.
  Perform the Work:
Once the system is verified as safe, begin the maintenance or repair.
  Restore Power:
After completing the work, re-energize the system by reversing the steps and performing the
necessary safety checks.
1.

Types of Isolation

 Safety Isolation:

A physical disconnection of the power supply, often using a lockable isolating switch, to
prevent re-energization.

  Galvanic Isolation:
A method that uses a physical barrier to separate two electrical circuits while still allowing the
transfer of power or data through non-electrical means, such as magnetic coupling (transformers)
or optical coupling (optocouplers).

Importance of Safety

 Failure to isolate properly can lead to unexpected re-energization, posing a severe


risk of injury or death to workers .

  Stored energy in capacitors and other components can also present a hazard even
after disconnection .
  Appropriate training and strict adherence to safety procedures are essential for safe
electrical work

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