Electrical Abstract-National Electrical Code-NEC
| Capacitor Bank for Power Supply Voltage | |
| System Voltage | Minimum rating of capacitor bank |
| 3.3 KV , 6.6KV | 75 Kvar |
| 11 KV | 200 Kvar |
| 22 KV | 400 Kvar |
| 33 KV | 600 Kvar |
| Capacities of PVC conduits | ||||
| Nominal conductor Size mm | 16 mm | 20 mm | 25 mm | 32 mm |
| Number of Cables (maximum) | ||||
| 1.0 | 6 | 5 | 19 | 30 |
| 1.5 | 5 | 4 | 15 | 24 |
| 2.5 | 3 | 3 | 11 | 17 |
| 4 | 2 | 2 | 8 | 13 |
| 6 | 2 | – | 6 | 10 |
| 10 | – | – | 4 | 6 |
| 16 | – | – | 3 | 4 |
| 25 | – | – | 2 | 3 |
| 35 | – | – | – | 2 |
| System Highest and Lower Voltage | ||
| Ref: NEC(India) :2011 | ||
| System Voltage | Highest Voltage | Lowest Voltage |
| 240 V | 264 V | 216 V |
| 415 V | 457 V | 374 V |
| 3.3 kV | 3.6 kV | 3.0 kV |
| 6.6 kV | 7.2 kV | 6.0 kV |
| 11 kV | 12 kV | 10 kV |
| 22 kV | 24 kV | 20 kV |
| 33 kV | 36 kV | 30 kV |
| 66 kV | 72.5 kV | 60 kV |
| 66 kV | 72.5 kV | 60 kV |
| 132 kV | 145 kV | 120 kV |
| 220 | kV 245 kV | 200 kV |
| 400 kV | 420 kV | 380 kV |
| Number of Points for Dwelling Unit | ||||||
| Ref: NEC(India) :2011 | ||||||
| No. | Description | Area for the Main Dwelling Unit (m2) | ||||
| 35 mm2 | 45 mm2 | 55 mm2 | 85 mm2 | 140 mm2 | ||
| 1 | Light points | 7 No | 8 No | 10 No | 12 No | 17 No |
| 2 | Ceiling fans Pont | 2 No | 3 No | 4 No | 5 No | 7 No |
| 3 | Ceiling fans No’s | 2 No | 2 No | 3 No | 4 No | 5 No |
| 4 | 6A Socket outlets | 2 No | 3 No | 4No | 5 No | 7 No |
| 5 | 16A Socket outlets | – | 1 No | 2 No | 3 No | 4No |
| 6 | Call-bell (buzzer) | – | – | 1 No | 1 No | 1 No |
| Recommended Schedule of Socket-Outlets | ||
| Ref: NEC(India) :2011 | ||
| Description | Number of Socket | |
| 6A Socket | 16A Socket | |
| Bedroom | 2 | 1 |
| Living room | 2 | 2 |
| Kitchen | 1 | 2 |
| Dining room | 2 | 1 |
| Garage | 1 | 1 |
| For refrigerator | – | 1 |
| For air-conditioner | – | 1 for each |
| Verandah | 1 per 10mter2 | 1 |
| Bathroom | 1 | 1 |
| Power requirements of the building | ||
| Ref: NEC(India) :2011 | ||
| Part of ElectricalInstallation | Part of the Total Power Requirement in % | DiversityFactor |
| Ventilation, heating (air-conditioning) | 45% | 1.0 |
| Power plant (drives) | 52% | 0.65 |
| Lighting | 30% | 0.95 |
| Lifts | 20% | 1.0 |
| Kitchen | 10% | 0.6 |
| Laundry | 5% | 0.6 |
| Lift Car Speed | ||
| Ref: NEC(India) :2011 | ||
| Occupancy | No. of Floors Served | Car Speed m/s |
| Office building | 4 to 5 | 0.5 to 0.75 m/sec |
| Office building | 6 to 12 | 0.75 to 1.5 m/sec |
| Shops and departmental stores | 13 to 20 | More than 1.5 m/sec |
| Passenger lifts for low and medium lodging houses | – | 0.5 m/sec |
| Hotels | 4 to 5 | 0.5 to 0.75 m/sec |
| Normal load carrying lifts | – | 2.0 to 2.5 m/sec |
| Hospital passenger Lift | 4 to 5 | 0.5 to 0.75 m/sec |
| Hospital passenger Lift | 13 to 20 | More than 1.5 m/sec |
| Hospital bed lifts (Short travel lifts insmall hospitals) | – | 0.25 m/sec |
| Hospital bed lifts (Normal) | – | 0.5 m/sec |
| Hospital bed lifts (Long travel lifts inGeneral hospitals) | 0.6 to 1.5 m/sec | |
| Capacitor Ratings at Rated Voltage | ||||||
| Ref: NEC(India) :2011 | ||||||
| Motor Rating(Kw) | Capacitor Rating in kVAR for Motor Speed | |||||
| 3 000rev/min | 1 500rev/min | 1 000rev/min | 750rev/min | 600rev/min | 500rev/min | |
| 2.25 | 1 | 1 | 1.5 | 2 | 2.5 | 2.5 |
| 3.7 | 2 | 2 | 2.5 | 3.5 | 4 | 4 |
| 5.7 | 2 | 3 | 3.5 | 4.5 | 5 | 5.5 |
| 7.5 | 3 | 4 | 4.5 | 5.5 | 6 | 6.5 |
| 11.2 | 4 | 5 | 6 | 7.5 | 8.5 | 9 |
| 15 | 5 | 6 | 7 | 9 | 11 | 12 |
| 18.7 | 6 | 7 | 9 | 10.5 | 13 | 14.5 |
| 22.5 | 7 | 8 | 10 | 12 | 15 | 17 |
| 37 | 11 | 12.5 | 16 | 18 | 23 | 25 |
| 57 | 16 | 17 | 21 | 23 | 29 | 32 |
| 75 | 21 | 23 | 26 | 28 | 35 | 40 |
| 102 | 31 | 33 | 36 | 38 | 45 | 55 |
| 150 | 40 | 42 | 45 | 47 | 60 | 67 |
| 187 | 46 | 50 | 53 | 55 | 68 | 76 |
| :Maximum Current Demand for Motor: | ||
| Ref: NEC(India) :2011 | ||
| Nature of supply | Size of installation | Maximum current demand |
| Single phaseor Three phase | Up to and including 0.75 kW | Six times the full load current |
| Above 0.75 kW and up to 7.5 kW | Three times the full load current | |
| Above 7.5 kW up to and up to11 kW | Two times the full load current | |
| Above 11 kW | One and half times the full load current | |
| Rated Basic Insulation Level (BIL) | |
| Ref: NEC(India) :2011 | |
| Nominal System Voltage (kV) | Rated BIL (kVp) |
| 33 KV | 170 |
| 22 KV | 125 |
| 11 KV | 75 |
| 6.6 KV | 60 |
| 3.3 KV | 40 |
| Illumination Level | |
| Ref: NEC(India) :2011 | |
| Location | Illumination Level (Lux) |
| Residence | |
| Entrance / Hallways | 100 |
| Living room | 300 |
| Dining Room | 150 |
| Bed Room (General) | 300 |
| Bed Room (Dressing , Bed Heads) | 200 |
| Kitchen | 200 |
| Kitchen sink | 300 |
| Bathroom | 100 |
| Sewing | 700 |
| Workshop | 200 |
| Staircase | 100 |
| Garage | 70 |
| Study Room | 300 |
| Office Building | |
| Entrance hall / Reception | 150 |
| Conference Room / Executive Office | 300 |
| General Office Space | 300 |
| Business Machinery Operation | 450 |
| Drawing Office | 450 |
| Corridors | 70 |
| Stairs | 100 |
| Lift landing | 150 |
| Hospital Building | |
| Reception & Waiting | 150 |
| General ward | 100 |
| Bed Side | 150 |
| Toilet | 70 |
| Stairs | 100 |
| Operation Theatre (General) | 300 |
| Operation Theatre (Operation Table) | Special |
| Laboratories | 300 |
| Radiology | 100 |
| Causality | 150 |
| Dispensaries | 300 |
| Laundry | 200 |
| Dry Cleaning | 200 |
| Ironing | 300 |
| General Office | 450 |
| Kitchen | 200 |
| Assembly & Concert Halls | |
| Foyers | 100 to 150 |
| Auditoria | 100 to 150 |
| Platform | 450 |
| Corridors | 70 |
| Stairs | 100 |
| Cinema Halls | |
| Foyers | 150 |
| Auditoria | 50 |
| Corridors | 70 |
| Stairs | 100 |
| Theatres | |
| Foyers | 150 |
| Auditoria | 70 |
| Corridors | 70 |
| Stairs | 100 |
| School / College Building | |
| Assembly Halls | |
| General | 150 |
| Examination center | 300 |
| Platform | 300 |
| Classes | |
| Desktop | 300 |
| Blackboard | 200 to 300 |
| Libraries | |
| Shelves | 70 to 150 |
| Reading Room | 150 to 300 |
| Reading Table | 300 to 700 |
| Cataloguing | 150 to 300 |
| General | |
| Office | 300 |
| Staff Room | 150 |
| Corridors | 70 |
| Stairs | 100 |
| Lamp’s Lumen Data | ||
| Rating (Watt) | Life (Hours) | Initial Lumens |
| Incandescent Lamp | ||
| 60 | 1000 | 870 |
| 100 | 750 | 1750 |
| 150 | 2000 | 1740 |
| 200 | 2000 | 2300 |
| 500 | 2000 | 6500 |
| Fluorescent Lamp | ||
| 18 | 7000 | 1120 |
| 20 | 7000 | 1020 |
| 36 | 7000 | 2800 |
| 40 | 7000 | 2700 |
| 2X40 | 7000 | 4000 |
| Compact Fluorescent Lamp | ||
| 5 | 10000 | 220 |
| 7 | 7000 | 380 |
| 11 | 7000 | 560 |
| 13 | 7000 | 680 |
| 15 | 7000 | 810 |
| 18 | 7000 | 1050 |
| 23 | 7000 | 1500 |
| 26 | 7000 | 1800 |
| 32 | 7000 | 2400 |
| Mercury Vapour Lamp | ||
| 100 | 18000 | 3700 |
| 175 | 24000 | 8600 |
| 250 | 24000 | 12100 |
| 400 | 24000 | 22500 |
| 1000 | 24000 | 57000 |
| Metal Halide Lamp | ||
| 50 | 15000 | 3400 |
| 70 | 15000 | 5600 |
| 100 | 15000 | 9000 |
| 150 | 10000 | 13500 |
| 175 | 10000 | 15000 |
| 250 | 10000 | 20500 |
| 400 | 20000 | 36000 |
| 1000 | 12000 | 110000 |
| High Pressure Sodium Vapour Lamps | ||
| 35 | 16000 | 2250 |
| 50 | 24000 | 4000 |
| 70 | 24000 | 5800 |
| 100 | 24000 | 9500 |
| 150 | 24000 | 16000 |
| 250 | 24000 | 27500 |
| 400 | 24000 | 47500 |
| 1000 | 24000 | 140000 |
| Pulse Start Metal Halide Lamp | ||
| 50 | 15000 | 3400 |
| 70 | 15000 | 5600 |
| 100 | 15000 | 9000 |
| 150 | 15000 | 15000 |
| 175 | 15000 | 17500 |
| 200 | 15000 | 21000 |
| 250 | 15000 | 26300 |
| 320 | 20000 | 34000 |
| 400 | 20000 | 44000 |
| 450 | 20000 | 50000 |
| :Duty Type of Motor: | ||
| Ref: IS-325 | ||
| Duty Type Symbol | Duty Type | Application |
| S1 | Continuous Duty | Pumps, Bowers, Compressors, Fans |
| S2 | Short Time Duty | Siren, Flood relief Gates |
| S3 | Intermittent Periodic Duty | Valve, Actuators, Wire drawing machine |
| S4 | Intermittent Periodic Duty with starting | Hoist, Cranes, Lifts, Escalators |
| S5 | Intermittent Periodic Duty with starting / Breaking | Hoist, Cranes (with electronics Breaks), Rolling mills |
| S6 | Continuous Duty with Intermittent Periodic Duty | Machine tools, Conveyors |
| S7 | Continuous Duty with starting / Breaking | Machine tools, |
| S8 | Continuous Duty with periodic load changes | Pole Channing Applications |
| Type of Distribution System | |
| As per IEC 60364-3 | |
| Unearthed System | Earthed System |
| IT | TT / TN (TN-S,TN-C,TN-C-S) |
| First Letter (the neutral point in relation to earth):T= directly earthed neutral (from the French word Terre)I =unearthed or high impedance-earthed neutral (e.g. 2,000 Ω) | |
| Second letter (Exposed conductive parts of the electrical installation in relation to earth):T =directly earthed exposed conductive partsN =exposed conductive parts directly connected to the neutral conductor | |