Electrical equipment must be switch off when not in use for a long time.
Personnel carrying out work on high voltage must be qualified and fully conversant with the nature and extent of the work to be carried out.
Unauthorized persons must not attempt to make repairs to electrical equipment. All unsafe appliances, lines and electrical apparatus should be reported to the electrical or supervisor.
When large valves are opened or connections removed to bleed down pressure vessel or lines great care must be taken to keep out the path of the escaping gas and flying particles.
Do not use your hand to determine the condition of pressure vessels or tines.
No one shall enter any vessels having contained oil, gas or chemical until such vessel has been properly cleaned vented and blank off and until a gas analysis has been made which show the vessel to be safe to enter.
Care should be exercised in issuing permit for men to work in semi-enclosed or poorly ventilated areas a gas test should always be obtained in such areas it there is any suspicion that toxic gases are present or if an oxygen deficient atmosphere exists.
All hot works in high-risk areas (presence of flammable gases) require the presence of a water hose on standby, to put out any fires that may result.
Before any work is carried out on system, always check whether if is "live" or not. This applies to both electrical and non-electrical systems.
The power supply must be switched off for electrical system if high voltage is involved.
Before dismantling any mechanical component on a pipeline, check that it not under pressure.
Works which involves high-power "live" systems, i.e. high voltage in electrical systems or high pressure in pneumatic/hydraulic systems, must require the presence of qualified personnel who should supervise the operations. Under no circumstances, should such work be carried out by unqualified personnel.
All works in areas of high risk (i.e. live electrical equipment, high pressure steam vessels, heated steam pipes etc) must require prior absolute clearance from the operating authorities concerned, to ensure safety before work can proceed.