Electrification for small house

Electrification for small house

Lighting Circuit

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	Load/Sq ft
Industrial	100 Watt/Sq ft
Commercial	30 Watt/Sq ft
Domestic	15 Watt/Sq ft

• Apply the diversity factor and Compute the load of all dwelling units in the area.

Type of Load	Diversity Factor
Industrial	0.5
Commercial	0.8
Domestic	0.4

• 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