Control of Hazardous Energies Refresher / V3 2023-12-04
Establishing an electrically safe work condition (when and how to establish.)
Whenever someone is required to enter the Limited Approach Boundary to do other tasks different than ‘visual inspection’ and whenever someone needs to enter the Restricted Approach Boundary for other tasks different from ‘switching’ or ‘measuring’
1) Determine all possible sources of electrical supply to the specific equipment. Check applicable up-to-date drawings, diagrams, and identification tags. 2) After properly interrupting the load current, open the disconnecting device(s) for each source. 3) Wherever possible, visually verify that all contact points of the disconnecting devices are fully open, or that draw-out type circuit breakers are withdrawn to the fully disconnected position. 4) To mitigate for activation spring failure in circuit breakers equipped with spring activation, the spring must be released prior to opening the breaker or prior to using the breaker as the isolation point. 5) Where the possibility of stored electrical energy exists, this must be isolated or insulated. Where this is not possible the energy must be dissipated by using an approved tool rated and designed for the purpose.
6) Verify absence of voltage to verify that the circuit parts are de- energised.
7) For low voltage circuits with the possibility of induced voltage, apply short-circuiting earth connections rated for the fault current. 8) Apply lockout/tagout devices in accordance with the local legislation and specific company procedure and rules. Depending on the configuration of the circuit it may be necessary to perform this step prior to steps five to seven. Electrical components or parts capable of being inadvertently touched or approached nearer than a safe distance by a person that is by not being enclosed or insulated (e.g. IP0X, IP1X)
Exposed electrical parts
Any energy (electrical, mechanical, hydraulic, pneumatic, chemical, thermal, gravitational force…) that could cause injuries to personnel.
Minimum arc flash PPE
• Non-melting clothing (including underwear) with long sleeves and long pants (small parts of melting materials are acceptable but should be
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