Friday, 20 July 2018

Electrical safety v/s OISD 192

i) Only persons having valid licenses shall be allowed to work on electrical facilities as per prevailing IE Act and rules there under including CEA rules/regulations.
ii) No person should be allowed to work on live circuit. The same, if unavoidable, special care and written authorization need to be taken.
0ISD 192

iii) Treat all circuits as "LIVE" unless ensured otherwise.
 iv) Electrical " Lock Out - Tag Out (LOTO)" procedure "MUST" be followed for work on electrical system. v) Display voltage ratings prominently with "Danger" signs in local language also.
vi) Put caution/notice signs before starting the repair works.
vii) All electrical equipment operating above 250V shall have two separate and distinct connections to earth grid.
viii) Proper grounding to be ensured for all switch boards and equipment including Portable ones prior to taking into service.
 ix) Make sure that electrical switch boards, portable tools, equipment (like grinding machine etc.) don't get wet during their usage. If it happens, stop the main supply, make the tools dry, check for specified insulation value and then only use them. Check proper earthing. All temporary switch boards/ KIOSKS put up at work site should be suitably protected from rain and the level of same should be high enough to avoid contact with water due to water logging.
 x) Don't work wet on electrical system.
 xi) Don't overload the electrical system.
xii) Use only proper rated HRC fuses / ELCB / MCB.
 xiii) Only ISI marked or equivalent industrial type extension boards and Plug sockets are to be used. xiv) ELCB for all temporary connections must be provided using 3 pin plug.
 xv) All power supply cables should be laid properly and neatly so that they don't cause hindrance to persons working and no physical damage also takes place to the cables during various construction activities.
xvi) All Power cables to be properly terminated using glands and lugs of proper size, type and crimped. xvii) Use electrical fittings in Hazard zones as per area classification under OISD-STD-113.
xviii) Ensure pipe sleeve / conduit to protect underground cables at crossings.
xix) Don't lay unarmored cable directly on ground, wall, roof or trees. All temporary cables should be laid at least 750 mm below ground and cable markers should be provided. Proper sleeves should be provided at road crossings. In case temporary cables are to be laid on wooden poles/steel poles, the minimum cable heights should be 4.5 M.
xx) Maintain safe overhead distance of HT transmission lines as per latest CEA Safety Regulation. xxi) Don't use pipelines/structures for earthing.
xxii) Don't make any unsafe temporary connections, e.g. naked joints etc.
 xxiii) Ensure that temporary cables are free from cuts, damaged insulation, kinks or improper insulated joints. xxiv) Check at periodic intervals that pins of sockets and joints are not loose.
xxiv) Check at periodic intervals that pins of sockets and joints are not loose.
xxv) Protect electrical wires/equipment from water and naked flames.
 xxvi) Illuminate level in all the work areas should be in line with OISD-RP-149.
 xxvii) All switchboards should be of MS structure only and incoming/outgoing feeders should be marked.
 xxviii) Hand lamps/ Torch should not be of more than 24V rating, and type should be in line with hazardous area classification.
xxix) Fire extinguishers (DCP/CO2/Sand buckets) should be kept near temporary switch boards being used for construction purposes. Don't use water for fighting electrical fires.
 xxx) ISI marked Insulating mats shall be provided in the front and back end of switch boards.
 xxxi) All parts of electrical installations should be so constructed, installed and maintained as to prevent danger of electric shock, fire and explosion. Periodic checking of electrical safety appliances such as gloves, insulating mats, hoods etc. to be done/witnessed in line with OISD-STD-137, and records to be maintained duly endorsed by the concerned.
xxxii) A notice displaying following, should be kept exhibited at suitable places in local language also: a) prohibiting unauthorized persons from entering electrical equipment rooms or from handling or interfering with electrical apparatus; b) containing directions as to procedures in case of fire, rescue of persons in contact with live conductors and the restoration of persons suffering from electric shock; c) specifying the person to be notified in case of electrical accident or dangerous occurrence, and indicating how to communicate with him.
xxxiii) No other cables/pipes to be laid in trench used for electrical cables. xxxiv) Utmost care should be taken while excavating Earth from cable trench to avoid damage or any accident.
xxxv) Sub-station floor cut-outs meant for switch board installations to be covered wherever installation is incomplete.
 xxxvi) Flameproofness integrity of all flameproof equipment / fittings/fixtures to be ensured at all times.
NOTE: A Residual Current Operated Circuit Breaker (RCCB) or Earth Leakage Circuit Breaker (ELCB), when installed, protects a human being to the widest extent. RCCB or ELCB should be provided as per latest CEA Safety

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