Most Useful Electrical Safety must know to all Electrical Engineer

Safety measures Before Working on High Voltage Electrical Equipment

  • Work on Live High Voltage Electrical Equipment is prohibited.
  • All High Voltage Electrical Equipment shall be regarded as Live until it has been Isolated, proven Dead and Earthed.
  • No person shall carry out any maintenance, repairs, alterations, cleaning, or Testing on High Voltage Electrical Equipment or the busbars or incoming connections of a Low Voltage switchboard, which is fed directly from a HV/LV transformer, until:
    • The High Voltage Electrical Equipment is Isolated from all possible points of supply, including voltage transformers, auxiliary transformers and common neutral Earthing equipment.
    • Safety Padlocks have been applied at all Isolated points of supply from the High Voltage Electrical Power System and, where practicable, from the Low Voltage Electrical Power System.
    • Caution Notices has been attached at all points of Isolation.
    • Live parts are screened where necessary to prevent Danger.
    • Danger Notices has been posted to identify adjacent Live Electrical Equipment.
    • Shutters of switchgear spouts containing Live conductors have been locked with Safety Padlocks and Danger Notices has been attached.
    • The parts are connected to Earth by Circuit Main Earths that have been applied at all points of Isolation from High Voltage supplies, or between such points, and the worksite or Testing. The parts shall be proved Dead using an Approved Testing device at the worksite. The Approved Testing device shall be checked immediately before and after use.
    • Earthed Notices have been attached to equipment that has been used to apply the Circuit Main Earths.
Electrical Safety Rules

Safety measures Before Working on Low Voltage Electrical Equipment

  • Work on Live Low Voltage Electrical Equipment is prohibited, except for battery systems where Isolation cannot be obtained.
  • Where Work on Live battery systems is unavoidable, then a Limitation of Access shall be issued, stating the precautions required to avoid Danger.
  • No person shall carry out any Work or Testing on Low Voltage Electrical Equipment until:
    • The Low Voltage Electrical Equipment is Isolated from all possible points of supply. The Isolation should normally be carried out by opening circuit breakers, contactors or switches or by removing fuses and inks. The operating handles of these circuit breakers/contactors/switches shall be locked in the open position with Safety Padlocks or other similar type locking devices.
    • Caution Notices has been attached at all points of Isolation.
    • When there is a possibility of induced voltages, stored electrical energy or backfeed, the Low Voltage Electrical Equipment shall be Earthed in addition to the required Isolation. Earthed Notices shall be attached at all points of Earthing.
    • Live parts are screened where necessary to prevent Danger.
    • Danger Notices have been posted to identify adjacent Live Electrical Equipment.
    • The Low Voltage Electrical Equipment is proven Dead with an Approved Low Voltage Testing device suitable for the rated voltage of the circuit. The Approved Testing device shall be checked for correct operation immediately before and after use.

Use of Safety Padlocks and Lock-Out Boxes

The keys to Safety Padlocks used to secure points of Isolation and Circuit Main Earths in position before the issue of an Electrical Permit to Work shall be placed in a Lock-out Box or other Approved safe place and not be removed until the Electrical Permit to Work has been cancelled.

Use for Sanction for Test

The keys to Safety Padlocks used to secure points of Isolation before a Sanction for Test is issued shall be placed in a Lock-out Box or other Approved safe place and not be removed until the Sanction for Test is cancelled.

Handling of Cables

Before Work starts on cables, following precautions must be taken,

  • Ensure that the cable has been correctly identified.
  • Isolate both ends of the cable and lock both switching devices using Safety Padlocks. Attach a Caution Notice to each Safety Padlock.
  • Prove that the cable is Dead and apply a Circuit Main Earth. Lock the Earth using a Safety Padlock and attach an Earthed Notice.
  • If the cable feeds a motor, then apply the precautions for Work on High Voltage or Low Voltage motors.
  • At the worksite, use an Approved spiking tool to cut the cable and demonstrate that the cable is Dead.
  • Place all Safety Padlock keys in the Lock-out Box.

Before allowing persons to handle the outside sheath of a cable that is Live, first examine its condition and identify the necessary precautions to address any hazards.

Work on Overhead Lines and Exposed Conductors

Where poles or structures support Live conductors that are part of an overhead line circuit, then these poles and structures should carry an Approved label or symbol to enable easy identification of the circuit from ground level. Double circuit overhead line towers and structures should carry Approved labels to enable easy identification from both ground level and by persons carrying out Work on one side of the tower or structure under an Electrical Safety Document.

Anti-climbing devices installed for the purpose of preventing climbing on to towers, structures shall always be kept locked and shall be opened only on the instruction from an Authorized Electrical Person.

Any person working upon any pole, tower or structure supporting electrical conductors, shall make proper use of Approved personal protective equipment.

The user shall examine the personal protective equipment on each occasion before use to see that it is in good condition.

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