Quick Reference-Fire Fighting (Part-1)


 

Class of Fire

CLASS Type of Fire Type of Fire Extinguisher
Class A Fires involving Paper, Wood, Textile, Packing materials and the like. Water, foam, ABC dry power and halocarbons.
Class B Fires involving Oil, Petrol, Solvent, Grease, Paints, Celluloid and the like. Foam, dry powder, clean agent and carbon dioxide extinguishers
Class C Fires involving Electrical Hazards, Motor Vehicle Gaseous substance under pressure. Dry powder, clean agent and carbon dioxide extinguishers
Class D Fires involving Chemicals, Metal and active like

Magnesium ,titanium

Extinguishers with special dry powder for metal tires

 

Area covered by Fire Extinguisher (NBC)

Type of Fire Extinguishers Coverage (Floor) Area
Water/ Sand Bucket 100 sq.mt.
Sprinklers 6 sq.mt.
Extinguishers (9 Liter) 600 sq.mt.
Heat Detectors 16 sq.mt.
Hydrant Riser (Outlet 100 mm dia with landing valve and First aid hose reel) 930 sq.mt
Smoke Detectors 50 sq.mt.

 

Water Requirement for the Fire Fighting (AS per NBC)

Q = 3000 P
Q = Fire demand in Liters/Minutes
P = Population in Thousands
Note:  The above rate must be maintained at a minimum pressure of 1 to 1.5 kg / cm2 for at least four hours.

 

Water Requirement for Wet Riser/Down Corner System (As per NBC -TABLE 4)

Residential Buildings U.G. Water Storage Tank Static Terrace Tank
15 m to 30 m 50,000 lts 10,000 lts
30 m to 45 m 1,00,000 lts 20,000 lts
Above 45 m 2,00,000 lts 40,000 lts

 

Water Requirement for Wet Riser/Down Corner System (As per NBC -TABLE 5)

Business Building U.G. Water Storage Tank Static Terrace Tank
15 m to 30 m 100000 lts (50000 lts if covered area in G.F is less than 300sq.m.) 20,000 lts
30 m to 45 m 20000 lts 20,000 lts
Above 45 m 250000 lts 50,000 lts

 

Classification of fire Pumps (As per IS 15301)

Pump Size Location of Pump Installation
450 Liter/Min Pumps to be installed on the terrace to feed the Down Comer System.
900 Liter/Min Pumps to be installed on the terrace to feed the Down Comer System.
2280 Liter/Min Pumps are to be housed in the pump house.
2850 Liter/Min Pumps are to be housed in the pump house.
4500 Liter/Min Pumps are to be housed in the pump house.
For special risks 6700 Liter/Min Pumps are to be housed in the pump house.

 

Suction and Delivery Pipe Sizes (IS 3844)

Pump Size Pump Location Suction Delivery
450 Liter/min Terrace 50 mm 50 mm
 900 Liter/min Terrace 75 mm 50 mm
1400 Liter/min Terrace 100 mm 100 mm
2280 Liter/min Fire Pump 150 mm 150 mm
2850 Liter/min Fire Pump 200 mm 150 mm
4500 Liter/min Fire Pump 250 mm 200 mm
6700 Liter/min Fire Pump 250 mm 200 mm

 

Different Types of Fire Extinguishers for Different Classes of Fires ( IS 2190 )

Type of Extinguisher IS Type of Fires
Class A Class B Class C Class D
water type (gas cartridge) IS 940 , IS 13385 S NS NS NS
water type (stored pressure) IS 6234 S NS NS NS
mechanical foam type (gas cartridge) IS 10204, IS 13386 S S NS NS
mechanical foam type (stored pressure)  IS 14951,IS 15397 S S NS NS
dry powder type (stored pressure)  IS 13849 S S S NS
dry powder type (gas cartridge)  IS 2171 , IS 10658 S S S NS
dry powder type for metal fires  IS 11833 NS NS NS S
carbon dioxide type  IS 2878, IS 8149 NS S S NS
clean agent gas type  IS 15683 S S S NS
halon 1211 type IS 4862 , IS 11108 S S S NS

 

PRESSURE TESTING OF FIRE EXTINGUISHERS  ( IS 2190 )

Type of Extinguisher IS Test Interval (Year) Test Pressure (kg/cm2) Pressure Maintained for Min. (kg/cm2)
Water type (gas cartridge) IS 940 3 35 2.5
Water type (stored pressure)  IS 6234 3 35 2.5
Water type (gas cartridge) IS 13385 3 35 2.5
Mechanical foam type (gas cartridge)  IS 10204 3 35 2.5
Mechanical foam type (stored pressure) IS 15397 3 35 2.5
Mechanical foam type (gas cartridge)  IS 13386 3 35 2.5
Mechanical foam type (gas cartridge) 135 liter  IS 14951 3 35 2.5
Dry powder ( stored pressure) IS l3849 3 35 2.5
 Carbon dioxide IS 2878 5 250 2.5
 Clean agent IS 15683 3 35 2.5
Dry powder (gas cartridge) IS2171, IS10658 3 35 2.5

 

LIFE OF FIRE EXTINGUISHERS ( IS 2190)

Type of Extinguisher Life Time, Year
Water type 10
Foam type 10
Powder type 10
Carbon dioxide 15
Clean agent 10

 

RECOMMENDATIONS FOR INSTALLATION OF FIRE EXTINGUISHERS  ( IS 2190 )

Occupancy Type of Occupancy Nature of Occupancy Class of
Fire
Typical Examples
Group A Residential buildings Low Hazard CLASS A Lodging or rooming, one or two family houses, private dwellings, dormitories, apartment houses, flats, up to 4 star hotels, etc
  Low Hazard CLASS C Small kitchens having LPG connection, electrical heaters, etc
  Medium Hazard CLASS A Multi-storied buildings, multi-risk buildings, five star hotels, etc
Group B Educational buildings Low Hazard CLASS A Tutorials, vocational training institutes, evening colleges, commercial institutes
  Medium Hazard CLASS A Schools, colleges, etc
Group C Institutional buildings Medium Hazard CLASS A Hospitals, sanatoria, homes for aged, orphanage jails, etc
Group D Assembly buildings-D-1 High Hazard CLASS A Theatres, assembly halls, exhibition halls, museums, restaurants places of worship, club rooms, dance halls, etc, having seating capacity of over 1 00 persons
Assembly buildings-D-2 High Hazard CLASS A Theatres, assembly halls, exhibitions halls, museums, restaurants, places of worship, club rooms, dance halls, etc, having seating capacity less than 1 000 persons
Assembly buildings-D-3 High Hazard CLASS A Theatres, assembly halls, exhibition halls, museums, restaurants, places of worship, club rooms, dance halls, etc, but having accommodation for more than 300 persons, but less than 1 000 persons, with no permanent seating arrangement
Assembly buildings-D-4 / D5 Low Hazard CLASS A Theatres, assembly halls, exhibition halls, museums, restaurants, places of worship, club rooms, dance halls, etc, but having accommodation less than 300 and those not covered under D-l to D-3
Group E Business buildings-E-1 Special Hazard CLASS A Offices, banks, record rooms, archives, libraries, data processing centers, etc
Business buildings-E-2 Medium Hazard CLASS B Laboratories, research establishment, test houses, etc
Business buildings-E-3 Special Hazard CLASS A Computer installations
Group F Mercantile buildings Medium Hazard CLASS A Shops, stores, markets, departmental stores,
underground shopping centers, etc
Group G Industrial buildings Low Hazard CLASS A Small industrial units
Medium Hazard CLASS A Corrugated carton manufacturing units, paper cane units, packing case manufacturing units, cotton waste manufacturing units
HH CLASS A Large number yards, saw mills, godowns and warehouses storing combustible materials, cold storages, freight depots, etc
Low Hazard CLASS B Demonstration chemical plants, small chemical processing plants, pilot plants, etc
Medium Hazard CLASS B Workshops, painting shops, large kitchens, industrial canteens, generator rooms, heat treatment shops, tread rubber manufacturing units, petrol bunks, tubes and Haps units, etc
High Hazard CLASS B Petroleum processing units, chemical plants, industrial alcohol plants, effluent treatment plants, etc
High Hazard CLASS C Fertilizer plants, petrochemical plants, LPG bottling plants, etc
High Hazard CLASS D All processes involving use of combustible highly flammable materials, reactive metals and alloys, including their storage
Group H Storage buildings Medium Hazard CLASS B Flammable liquid stores, storage in drums and cans in open, paints and varnishes go down
High Hazard CLASS B Tank farms, chemical and petroleum bulk storage depots, large service stations, truck and marine terminals, underground LDO/furnace oil storage yards, etc
Medium Hazard CLASS C LPG distribution godown/office, distribution storage godowns/offices of D, N, H, Argon and other industrial gases
High Hazard CLASS C Storage and handling of gas cylinders in bulk, gas plant, gas holders ( Horton), spheres, etc
Group J Hazardous Buildings used for storage, handling, manufacture and processing of highly combustible explosive materials. (Risks involved in terms of class of fire and intensity of fire has to be assessed on case to case basis and statutory authorities to be consulted, environmental factors and mutual aid facilities to be taken into account before deciding on the fire extinguisher requirements.)

 

RECOMMENDED  EQUIPMENT TO BE INSTALLED ( IS 2190 )

Class of Fire  Occupancy No of Fire Systems
CLASS A Low Hazard One 9 liter water expelling extinguisher or ABC 5 kg/6 kg fire extinguisher, for every 200 m2 of floor area or part thereof with minimum of two extinguishers per compartment or floor of the building.
Medium Hazard Two 9 liter water expelling extinguishers or ABC 5 kg / 6 kg fire extinguisher, for every 200 m2 with minimum of 4 extinguishers per compartment floor.
Medium Hazard Provision as per MH occupancy; in addition to one 50 liter water CO2/25 kg ABC fire extinguisher for every 100 m2 of floor area
Special Hazard One 4.5 kg capacity carbon dioxide or one 2/3 kg capacity clean agent extinguisher for every 100 m2 of floor area or part thereof with minimum of two extinguishers
CLASS B Low Hazard One 9 liter foam extinguisher, mechanical or BC or ABC, 5 kg/6 kg fire extinguisher, for every 200 m2 of floor area or part thereof with minimum of two extinguishers per compartment or floor.
Medium Hazard Two 9 liter foam extinguisher, mechanical type, or 5/6 kg dry powder extinguisher ( or one of each type) for every 200 m2 area with minimum of four extinguisher per compartment
Medium Hazard Provision as per MH, and in addition to one 50 liter mechanical foam type extinguisher or 25 kg BC fire extinguisher for every 100 m2 or part thereof one l35 liter foam mechanical extinguisher for every 300 m2 of floor area
CLASS C Low Hazard One 2/3 kg dry powder of clean agent extinguisher for every 20 m2 of floor area
Medium Hazard One 10 kg dry powder extinguisher (stored pressure) or 6.5 kg  carbon dioxide extinguisher or 5 kg clean agent for 100 m2 of floor area or part thereof, with minimum of one extinguishers of the same type for every compartment;
High Hazard Dry powder extinguisher (stored pressure) of 10 kg or 6.5 kg CO2 extinguisher, or 5 kg clean agent extinguisher for every 100 m2 of floor area or part thereof, subject to a minimum of two extinguishers of same type per room or compartment.
CLASS D High Hazard One 10 kg dry powder extinguisher with special dry powder for metal fires for every 100 m2 of floor area or part thereof with minimum of two extinguishers per compartment/room

 

Internal Electrical Work -Abstract of CPWD


 

Circuits:

Topic Abstracts
Lighting Circuit Per Circuit Not more than 10 Points of Lighting or Total 800Watt which is less
Power Circuit For Residential Per Circuit Less than 2 No of 5A/15A Plug Socket
Power Circuit For Non Residential Per Circuit Less than 1 No of 5A/15A Plug Socket
Plug Socket In Residential wiring ,wiring of Socket outlet shall be done by copper Cable only
Min Size of Wire For Lighting Circuit Smallest size of conductor shall be 1.5 Sq.mm
Min Size of Wire For Power Circuit Smallest size of conductor shall be 4 Sq.mm

Plug Socket

Plug Socket 5A/6A or 15A/16A Socket shall be installed at following heights:                                                                   =For Non Residential building 23cm above  floor

=For Kitchen 23cm above  Platform. 

=For Bathroom not Socket is provided in bathroom MCB/IC will be 2.1 mt from fixed appliance and at least 1 mt away from Shower

Switch Board /  D.B

Operating Rod Operating Rod/Handle of Distribution Board at the height of min 2mt
D.B Clearance Clear Distance in front of Switch Board/D.B shall be min 1 mt.
D.B Clearance If there may be bare connection at back of Switch Board than space behind S/W shall be either less than 20cm or more than 75cm
D.B Clearance No fuse Body shall be mounted within 2.5 com edge of D.B or Panel
D.B Clearance Clearance between 2.5 cm is maintained between opposite polarity
Switch Box Switch Box or Regular Box shall be mounted normally 1.25 mt from floor level.

Fan Hook

Fan Hook For Fan Hook in concrete roof 12mm dia MS Rod in ‘U’ Shape, horizontally Leg at Top at least 19 cm on either side.

Connection between adjustment Building (Out House, Garages)

Safety Clearance If the distance with adjustment building is less than 3 mt and there is no any Road interval than GI pipe of suitable size shall be installed. This pipe shall be exposed on wall at height of not less than 2.5 mt.
Safety Clearance If the distance with adjustment building is more than 3 mt and there is any Road interval than GI pipe of suitable size shall be installed. This pipe shall be exposed on wall at height of not less than 4 mt.

Conduit

Metallic Conduit Shall be used for Industrial wiring, Heavy mechanical Stress, shall be ISI marked, The Thickness shall not be less than 1.6mm(16SWG) for conduits up to 32mm Dia and not less than 2mm (14SWG) for conduit above 32mm Dia.
Metallic Conduit No steel conduit less than 20 mm Diameter shall be used.
Metallic Conduit For rigid Conduit IS:2509/IS:3419 and For Flexible Conduit IS:6946.
Metallic Accessories All Metallic conduit accessories shall be threaded type (Not pin grip, clamp grip)
Metallic Accessories Saddle for surface conduit work on wall shall not less than 0.55mm(24 gauge) for conduit up to 25mm Dia not less than 0.9mm (20 gauge) for larger Dia
Metallic Outlets Fore Cast Boxes:

Wall thickness shall be at least 3mm.                                                                                                

For Welded mild Steel Box:

Wall thickness shall not be less than 1.2mm (18 gauge) for Boxes up to size 20cmX30cm. Above This size 1.6mm(16guage)thick MS Boxes shall be used.

Metallic Outlets Clear depth of Out less Box shall not be less than 60mm.

This will be increased as per mounting of Fan regulator

Bends in Conduits Bending radius not less than 7.5 cm
Fixating Conduits on Surface Conduits shall be fixed by saddles not less than 1mt interval but in case of coupler/Bends in either side of saddles, The saddle shall be fitted 30 cm from fitting.
Non Metallic Accessories Normally grip Type.
Non Metallic Outlet(PVC Box) PVC Box IS:5133(PartII) thickness not less than 2mm,Clear depth of PVC Boxes not less than 60mm.
Non Metallic Surface Conduit Conduits shall be fixed by saddles not less than 60cm interval but in case of coupler/Bends in either side of saddles, The saddle shall be fitted 15 cm from fitting.

Junction Box

Junction Box Depth of Junction Box shall be min 65mm as per IS: 2667.

Fish Wire

Fish Wire GI fish wire of 1.6mm/1.2mm (16SWG) shall be used.

Bus bar

Bus bar Busbar shall be 100A,200A,300A,400A,500A,600A,800A
Bus bar The Cross-section area of Bus bar shall be same as Phase Bus bar (Up to 200A) for higher Capacity Neutral Bus bar must be not less than half cross section areas of Phase Bus bar.
Bus bar Bus bar shall be suitably installed with PVC sleeve/Tap.
Bus bar Bus bar Chamber shall be fabricated with MS angle for Frame work and sheet steel of thickness not less than 1.5mm.
Bus bar Minimum clearance between phase to earth shall be 26mm and phase to phase shall be 32mm.

Bus bar Trucking

Bus bar Trucking  Bus bar Trucking are generally used for interconnection between T/C over 500KVA/D.G set over 500KVA and their switch Board Panel.
Bus bar Trucking Bus bar Trucking enclosure sheet steel of min 2mm thickness

Earthing

Earthing Type of earthling are Pipe earthling/Plate earthling/Strip earthling.
Earthing Length of Buried strip shall not be less than 15mt.
Earthing Two copper strip, each size 50mmX5mm shall be provided as each bus bar in 11KV S/S or D.G generally.
Earthing Each strip should be connected separately to earth.
Earthing Two no of Body earthling of T/C,Panel,D.G are connected to earth Bus.
Earthing Neutral Leads of T/C,D.G shall not be connected to earth Bus.
Earthing The minimum Cross-section are of protective conductor (Not contained within cable or wire) 2mm Dia(14SWG) for Copper, 2.5mm Dia(12SWG) for G.I, 2.24mm Dia(13SWG) for Aluminum.
Earthing Earthing Pit shall not be closer than 1.5mt from Building.
Earthing Top of Pipe earthling electrode shall not be less than 20cm below the ground
Earthing Plate electrode shall be buried in ground with face vertical and it’s Top not less than 3mt below ground level.
Earthing The strip of earthling electrode shall be buried in trench not less than 0.5m deep.
Earthing If strip electrode cannot be laid in straight length. It may be Zigzag with deviation up to 45 Degree from axis of strip.
Earthing In Plate Earthing Dia of water pipe shall not be less than 20mm and in Pipe earthling reducer of 40mmX20mm shall be used.
Earthing Earthing Pit Size shall be not less than 30cmX30cmX30cm.
Earthing Thickness of MS cover of earthling pit shall be not less than 6mm and having locking arrangements.
Earthing Earthing resistance of each electrode shall be less than 5Ω and for Rocky Soil not less than 8Ω
Earthing Earthing conduit for earthling wire shall be Medium class 15mm Dia GI pipe and for Earthing Strip shall be medium class 40mm Dia GI Pipe.

Conductor Clearance(min)

Cable crossing The horizontal and vertical distance between Power and Communication cable shall not be less than 60cm.
Railway crossing After taking approval of railway authority, Cable under railway track shall be min 1mt from bottom of sleeper under RCC or cast Iron Pipe.
Railway crossing Cable in parallel to Railway track shall be min 3mt far away from centre of nearest Track.
Cable Laying in Pipe For Single Conductor Shall be min 10cm Dia and more than Two Cable shall be min 15cm Dia.
Cable in Road Crossing In Road Crossing Cable shall be laid min 1 mt below Road in Pipe.

Cable trench

Cable trench For single cable: For below 11Kv.Min length of Trench shall be 35cm and depth shall be min 75cm ( with sand cushioning of 8cm at bottom +Cable+ protective covering/Sand cushioning of 17cm above Cable) and without Cushioning Depth shall be 75cm+25cm.
Cable trench For single cable: For above 11Kv.Min length of Trench shall be 35cm and depth shall be min 1.2mt ( with sand cushioning and protective covering).
Cable trench For multi cable in horizontal level: Min distance between two cable shall be 20cm and min distance between cable and edge of trench on both side shall be 15cm
Cable trench For multi cable in Vertical level: Min distance between two cable shall be 30cm.(min Sand cushioning at bottom of trench shall be 8cm +Cable+min Sand cushioning of 30cm+Cable+protective covering/Sand cushioning of 17cm above Cable)
Cable trench For LV/MV cable cushioning is not required where there is no possibility of mechanical damages.
Cable trench Extra loop of cable at end shall be 3mt for cable termination/Joints.

Cable Route

Cable Route Marker Cable Route Marker shall be min 0.5mt away from cable trench at the interval not exceeding 100mt parallel.
Cable Route Marker Plate Type Cable Route Marker shall be made of 100mmX5mm GI/Aluminum Plate welded/Bolted on 35mmX35mmX6mm Iron angle of 60cm Long.
Cable Route Marker Cement Concrete(C.C) type marker shall be made in formation of 1:2:4.

Cable Bending Radius

Cable Bending Radius Voltage      1Core          Unarmoured(Multi core)    Armoured(Multi core)                                                    11KV          20D                   15D                                        2D                                                                      22KV              20D                20D                                       15D 

 33KV              20D                25D                                      20D                                                   

Cable Tray (Perforated)

Cable Tray (Perforated) Cable Tray may be fabricated by two angle irons of 50mmX50mmX6mm as two longitudinal members with cross bracing between them 50mmX5mm welded/Bolted at angle and 1 mt spacing of 2mm thick MS sheet.

Overhead Line

Steel Tubular Pole 1/6 length of Steel Tubular Pole + 30 cm from base shall be coated with Black Bituminous paint on both internally and externally.

The remaining portion of the pole shall be painted with Red oxide.

Cross arm LV/MV Line: MS angle iron of size not less than  50mmX50mmX6mm(4.5kg/mt)                                                                 

11KV  Line: MS angle iron of size not less than 65mmX65mmX6mm(5kg/mt)

Cross arm LV/MV Line: MS Chanel iron of size not less than 75mmX40mmX4.8mm(7.14kg/mt)

11KV  Line: MS Chanel iron of size not less than 75mmX40mmX4.8mm(7.14kg/mt) 

Cross arm For LV/MV Line:

Min distance shall be 5cm between centre of insulation pin and end of cross arm.                                    

For 11KV Line:

Min distance shall be 10cm between center of insulation pin and end of cross arm.  

Cross arm Length Voltage        No of Horizontal Conductor        Length of Cross Arm                                                   LV/MV         2 Conductors                                   55cm                                                                              LV/MV          4 Conductors                                  115cm                                                                            LV/MV         4 Conductors Guard                         175 cm 

11KV            3 Conductors                                  225cm

Struts The Pit for Struts shall be located not less than 1.8mt from pole side. The depth of Pit shall be at least 1.2mt
Danger board All Support carrying HV Line shall be fitted with Danger Board( IS:2551) at height of 3mt.
Anti Climbing Device For HV Line(IS:278-1978) having 4Point Barbs 75mm+12mm apart weight 128/125 gm/mt shall be wrapped helically with pitch of 75mm around Limb of Pole height of 3.5mt to 5 to 6 mt.
Insulator For LV/MV Overhead Line: Pin/Shackle Insulator and For 11KV Line Pin/Disc Insulator
Insulator For Pin Insulator for LV/MV line:

 Stalk Length 135mm Shank Length 125 mm , min Load 2KN.                                                                  For Pin Insulator for 11KV  line:

Stalk Length 165mm Shank Length 150 mm ,min Load 2KN.

D Clamp D clamp shall be made of MS Flat size of 50mmX6mm,height of 75mm Galvanized and only used for vertical configuration for LV/MV Line only.
Pole Top Clamp Pole Top clamp made from Flat iron 50mmX8mm.
Stay wire Rod Stay wire Rod shall not be less than 1.8 m Long and 19mm Dia.Ankor Plate shall not be less than 45mmX45mmX7.5mm.
Overhead Conductor (min) For LV  Line :

AAC(All Alu.Cond) 7/1/2.21mm, ACSR 6/1/1/2.11mm, AAAC(All Alu.Alloy Cond) 7/2.09mm(20Sqmm)    

For 11KV/33KV   Line :

AAC(All Alu.Cond) N/A, ACSR 6/1/1/2.11mm, AAAC(All Alu.Alloy Cond) 7/2.56mm(30Sqmm)

Binding Wire Binding Wire with insulator shall be with 2.6mm(12SWG) soft aluminum wire.
Earthing in Overhead Line Earthing wire shall not be less than 4mm(8SWG) and min 3 earthling Pit per KM shall be required.

 If there is no Continuous wire for earthling in overhead line than each pole should be earthed.

Overhead Line Conductor Clearance(min)

Same Support For LV/MV Line on Same Support Vertical distance:

Between Phase to Earth shall be min 30cm and

Between Phase to Phase min 20cm

Same Support For LV/MV Line on Same Support  Horizontal distance:

Between Live wire on either side of support shall be 45cm.

Same Support For LV/MV Line on Same Support  Horizontal distance:

Between Live wire on same side of support shall be 30cm.

Same Support For LV/MV Line on Same Support Horizontal distance:

 Between central of pin insulator to end of cross Arm shall be 05cm.

Same Support For HV Line In Triangular Configuration for 11KV/33KV Line shall be min 1.5mt.
Different Voltage When Two conductor of different Voltage are erected on same support min clearance between LV/MV and 11KV shall be min 1mt.
Different Support A Clearance not less than height of tallest support may be maintained between parallel overhead line on Different support.
Different Support When Two overhead line cross each other vertical clearance between LV/MV and 11KV shall not be less than 1.25mt and for LV/MV and 33KV line shall be not less than 2mt.
Across Road Min Conductor Clearance across Road:

For LV/MV Line is 5.8mt and for HV Line 6.1mt

Along Road Min Conductor Clearance along Road:

For LV/MV Line is 5.5mt and for HV Line 5.8mt

Along/Across Min Conductor Clearance along/across Road:

For LV/MV/HV up to 11Kv (Bare Cond) Line is 4.6mt.                                    

Min Conductor Clearance along/across Road:

For LV/MV/HV up to 11Kv (Insulated Cond) Line is 4.0mt.                            

Min Conductor Clearance along/across Road:

 For HV (11Kv To 33Kv) Line is 5.2mt.                                                          

Min Conductor Clearance along/across Road:

 For EHV (above 33Kv) is 5.2mt + 0.3 mt for every 33KV(Not Less than 6.1).

From Building Min Conductor Vertical Clearance above Building:

For LV/MV Line is 2.5mt from highest Point.                                            

Min Conductor Horizontal Clearance near Building:

For LV/MV Line is 1.5mt from nearest Point.                                        

Min Conductor Vertical Clearance above Building:

 For MV/EHV(up to 33KV)  Line is 3.7mt from highest Point.                                          

Min Conductor Vertical Clearance above Building:

 For MV/EHV(above 33KV)  Line is 3.7mt + 0.3mt for every 33KV                                                                                                                                                                 Min Conductor Horizontal Clearance above Building:

For MV/EHV(Up to 11KV)  Line is 1.2mt.                                             

Min Conductor Horizontal Clearance above Building:

For EHV(Up to  33KV)  Line is 02mt.                                                     

Min Conductor Horizontal Clearance above Building:

For EHV(above  33KV)  Line is 2mt + 0.3mt for every 33KV

Looping Box

Looping Box Looping Bus shall be fabricated from MS Sheet of 1.6mm(16SWG) thickness, Min Size 250mmX200mmX100mm for single cable entry and for 250mmX300mmX100mm for more than two cable entry

Feeder Pillar

Feeder Pillar Feeder Pillar shall be fabricated min 2mm thick MS sheet and hinged type double door at front side. If width of Pillar shall be less than 60cm than single hinged type door shall be permitted.
Feeder Pillar Min height of Pedestal of Feeder Pillar shall be not less than 45cm and 1 to 2 mt height from Road Level.
Feeder Pillar Each Feeder Pillar shall be earthed with 2 no of Earthing electrode.

Substation

Area of S/S S/S                TC Room Area      Total S.S Area(T.C,HT/LT Panel, without DG)                                      2X500KVA     36 Sq.meter            130 Sq.meter                                                                                       3X500KVA     54 Sqmeter             172 Sq.meter                                                                                           2X800KVA     39 Sqmeter             135 Sq.meter                                                                                       3X800KVA    58 Sqmeter             181 Sq.meter                                                                                        2X1000KVA   39 Sqmeter             149 Sq.meter                                                                                           2X1000KVA   58 Sqmeter             197 Sq.meter

 

 

 

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