Electrification for small house
Lighting Circuit
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| Electrification |
- 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
- 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
- For Power Circuit Smallest size of conductor shall be 4 Sq.mm
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 meter from fixed appliance and at least 1 meter away from Shower.
Operating Rod
- Operating Rod/Handle of Distribution Board at the height of min 2meter
D.B Clearance
- Clear Distance in front of Switch Board/D.B shall be min 1 meter.
- 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.
- No fuse Body shall be mounted within 2.5 com edge of D.B or Panel
- Clearance between 2.5 cm is maintained between opposite polarity.
Switch Box
- Switch Box or Regular Box shall be mounted normally 1.25 meter from floor level.
Fan Hook
- For Fan Hook in concrete roof 12mm diameter MS Rod in ‘U’ Shape, horizontally Leg at top at least 19 cm on either side.
Bends in Conduits
- Bending radius not less than 7.5 cm
Fixing Conduits on Surface
- Conduits shall be fixed by saddles not less than 1meter interval but in case of coupler/Bends in either side of saddles, The saddle shall be fitted 30 cm from fitting.
Junction Box
- Depth of Junction Box shall be min 65mm as per IS: 2667.
Non Metallic Conduit Accessories
- Normally grip Type.
- 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.
Earthing
- Type of earthling are Pipe earthling/Plate earthling/Strip earthling
- Two nos. of Body earthling of T/C, Panel, D.G are connected to earth Bus.
- 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
- Earthing Pit shall not be closer than 1.5meter from Building.
- Plate electrode shall be buried in ground with face vertical and it’s top not less than 3meter below ground level.
- Earthing Pit Size shall be not less than 30cmX30cmX30cm.
- Thickness of MS cover of earthling pit- 6mm with locking arrangements.
- Earthing resistance of each electrode-less than 5Ω and for Rocky Soil - 8Ω
Calculation of Load:
- Find out built up area in Sqft.of per flat per House/Dwelling unit.
- Multiply area in Sqft. by Load/Sqft according to following Table
Type of Load
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Load/Sq ft
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Industrial
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100 Watt/Sq ft
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Commercial
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30 Watt/Sq ft
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Domestic
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15 Watt/Sq ft
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- Apply the diversity factor and Compute the load of all dwelling units in the area.
Type of Load
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Diversity Factor
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Industrial
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0.5
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Commercial
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0.8
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Domestic
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0.4
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- Add the load of common services such as Auditorium, Street Lights, Lifts and Water Pumps etc. For simplicity purpose 0.5kW/dwelling units may be considered as common load.
- Compute the “Total Load” of the area by adding load observed at above.
- Apply the power factor of 0.8 to determine the load in kVA.
- Compute the Load in kVA= “Total Load”/0.8
- Take transformer loading of 65%
typical lay out
