Electrical Notes
Revision-4: 1.7.2016
Jignesh.Parmar
www.electricalnotes.wordpress.com
Note: All Notes/Abstract s are based on some electrical References. All References are mentions at the end of Note.
, : INDEX:
Part-1 :Electrical Quick Data Reference:
Chapter Description Page No
1 Measuring Units 7
2 Electrical Equation 8
3 Electrical Thumb Rules 10
4 Electrical Cable & Overhead Line Bare Conductor Current Rating 12
Electrical Quick Reference
5 Electrical Quick Reference for Electrical Costing per square Meter 21
6 Electrical Quick Reference for Electrical Voltage Limit 23
7 Electrical Quick Reference for D.G set 29
8 Electrical Quick Reference for HVAC 32
9 Electrical Quick Reference for Earthing Conductor / Wire 34
10 Electrical Quick Reference for Transformer 39
11 Electrical Quick Reference for Capacitor 45
12 Electrical Quick Reference for Cable Gland 48
13 Electrical Quick Reference for Current Transformer 50
14 Electrical Quick Reference for Demand Factor-Diversity Factor 52
15 Electrical Quick Reference for illuminance Level 55
16 Electrical Quick Reference for IP Standard 62
17 Electrical Quick Reference Motor 63
18 Electrical Quick Reference O/L Relay , Contactor for Starter 65
19 Electrical Quick Reference for Motor Terminal Connections 76
Electrical Safety Clearance
20 Electrical Safety Clearances-Qatar General Electricity 78
21 Electrical Safety Clearances-Indian Electricity Rules 80
22 Electrical Safety Clearances-Northern Ireland Electricity (NIE) 83
23 Electrical Safety Clearances-ETSA Utilities / British Standard 86
24 Electrical Safety Clearances-UK Power Networks 87
25 Electrical Safety Clearances-New Zealand Electrical Code (NZECP) 88
26 Electrical Safety Clearances-Western Power Company 90
27 Electrical Safety Clearance for Electrical Panel 91
28 Electrical Safety Clearance for Transformer. 93
29 Electrical Safety Clearance for Sub Station Equipment’s 95
30 Typical Values of Sub Station Electrical Equipment‘s. 100
31 Minimum Acceptable Specification of CT for Metering 104
32 Insulation Resistance (IR) Values 106
33 Standard Makes & IS code for Electrical Equipment‘s 117
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, Abstract of Electrical Standard
34 Abstract of CPWD In Internal Electrification Work 120
35 Abstract of IE Rules for DP Structure 125
36 Abstract of IS: 3043 Code for Earthing Practice 127
37 Abstract of IS:5039 for Distribution Pillars (<1KV AC & DC) 128
38 Abstract IS: 694 / IS:1554 / IS: 11892 for Cable 130
39 Abstract IS:15652 for Insulating Mat 132
Abstract IS: 11171 for Transformer
40 Abstract IS: 1678 / IS:1445 133
41 Abstract IS: 1255 for Cable Rote &Laying Method of Cable 134
42 Abstract IS: 5613 for HV Line 136
43 Abstract of Indian Electricity Rules (IE Rules) 141
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, Part-2 :Electrical Calculation:
Chapter Description Page No
44 Calculate Number of Earthing Pits for System 145
45 Calculate Size of Cable for Motor as per National Electrical Code 151
46 Calculate Transformer Protection as per National Electrical Code 153
47 Calculate over current Protection of Transformer (NEC 450.3) 154
48 Calculate Size of Contactor, Fuse, C.B, O/L Relay of DOL Starter 160
49 Calculate Size of Contactor, Fuse, C.B, O/L Relay of Star-Delta Starter 162
Calculate Transformer Size & Voltage Drop due to starting of Single Large
50 165
Motor
51 Calculate TC Size & Voltage Drop due to starting of multiple no of Motors 166
52 Calculate Voltage Regulation for 11KV, 22KV, 33KV Overhead Line ( REC) 167
53 Calculation Technical Losses of Distribution Line 170
54 Calculate Cable Size and Voltage Drop of HT / LV Cable 172
55 Calculate IDMT over Current Relay Setting (50/51) 175
56 Calculate Size of Capacitor Bank / Annual Saving & Payback Period 177
57 Calculate No of Street Light Pole 180
58 Calculate No of Lighting Fixtures / Lumens for Indoor Lighting 182
59 Calculate Street Light Pole Distance &Watt Area 183
60 Calculate Short Circuit Current (Isc) 184
61 Calculate Size of Bus bar for Panel 189
62 Calculate Size of Cable Tray 193
63 Calculate Size of Diesel Generator Set 195
64 Calculate Size of Main ELCB & Branch MCB of Distribution Box 198
65 Calculate Size of Solar Panels 203
66 Calculate Size of Inverter & Battery Bank 205
67 Calculate Cable Trunking Size 209
68 Calculate Size of Conduit for Cables / Wires 210
69 Calculate Cable Voltage Drop for Street Light Pole 211
70 Calculate Lighting Protection for Building / Structure 214
www.electricalnotes.wordpress.com |4
Revision-4: 1.7.2016
Jignesh.Parmar
www.electricalnotes.wordpress.com
Note: All Notes/Abstract s are based on some electrical References. All References are mentions at the end of Note.
, : INDEX:
Part-1 :Electrical Quick Data Reference:
Chapter Description Page No
1 Measuring Units 7
2 Electrical Equation 8
3 Electrical Thumb Rules 10
4 Electrical Cable & Overhead Line Bare Conductor Current Rating 12
Electrical Quick Reference
5 Electrical Quick Reference for Electrical Costing per square Meter 21
6 Electrical Quick Reference for Electrical Voltage Limit 23
7 Electrical Quick Reference for D.G set 29
8 Electrical Quick Reference for HVAC 32
9 Electrical Quick Reference for Earthing Conductor / Wire 34
10 Electrical Quick Reference for Transformer 39
11 Electrical Quick Reference for Capacitor 45
12 Electrical Quick Reference for Cable Gland 48
13 Electrical Quick Reference for Current Transformer 50
14 Electrical Quick Reference for Demand Factor-Diversity Factor 52
15 Electrical Quick Reference for illuminance Level 55
16 Electrical Quick Reference for IP Standard 62
17 Electrical Quick Reference Motor 63
18 Electrical Quick Reference O/L Relay , Contactor for Starter 65
19 Electrical Quick Reference for Motor Terminal Connections 76
Electrical Safety Clearance
20 Electrical Safety Clearances-Qatar General Electricity 78
21 Electrical Safety Clearances-Indian Electricity Rules 80
22 Electrical Safety Clearances-Northern Ireland Electricity (NIE) 83
23 Electrical Safety Clearances-ETSA Utilities / British Standard 86
24 Electrical Safety Clearances-UK Power Networks 87
25 Electrical Safety Clearances-New Zealand Electrical Code (NZECP) 88
26 Electrical Safety Clearances-Western Power Company 90
27 Electrical Safety Clearance for Electrical Panel 91
28 Electrical Safety Clearance for Transformer. 93
29 Electrical Safety Clearance for Sub Station Equipment’s 95
30 Typical Values of Sub Station Electrical Equipment‘s. 100
31 Minimum Acceptable Specification of CT for Metering 104
32 Insulation Resistance (IR) Values 106
33 Standard Makes & IS code for Electrical Equipment‘s 117
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, Abstract of Electrical Standard
34 Abstract of CPWD In Internal Electrification Work 120
35 Abstract of IE Rules for DP Structure 125
36 Abstract of IS: 3043 Code for Earthing Practice 127
37 Abstract of IS:5039 for Distribution Pillars (<1KV AC & DC) 128
38 Abstract IS: 694 / IS:1554 / IS: 11892 for Cable 130
39 Abstract IS:15652 for Insulating Mat 132
Abstract IS: 11171 for Transformer
40 Abstract IS: 1678 / IS:1445 133
41 Abstract IS: 1255 for Cable Rote &Laying Method of Cable 134
42 Abstract IS: 5613 for HV Line 136
43 Abstract of Indian Electricity Rules (IE Rules) 141
www.electricalnotes.wordpress.com |3
, Part-2 :Electrical Calculation:
Chapter Description Page No
44 Calculate Number of Earthing Pits for System 145
45 Calculate Size of Cable for Motor as per National Electrical Code 151
46 Calculate Transformer Protection as per National Electrical Code 153
47 Calculate over current Protection of Transformer (NEC 450.3) 154
48 Calculate Size of Contactor, Fuse, C.B, O/L Relay of DOL Starter 160
49 Calculate Size of Contactor, Fuse, C.B, O/L Relay of Star-Delta Starter 162
Calculate Transformer Size & Voltage Drop due to starting of Single Large
50 165
Motor
51 Calculate TC Size & Voltage Drop due to starting of multiple no of Motors 166
52 Calculate Voltage Regulation for 11KV, 22KV, 33KV Overhead Line ( REC) 167
53 Calculation Technical Losses of Distribution Line 170
54 Calculate Cable Size and Voltage Drop of HT / LV Cable 172
55 Calculate IDMT over Current Relay Setting (50/51) 175
56 Calculate Size of Capacitor Bank / Annual Saving & Payback Period 177
57 Calculate No of Street Light Pole 180
58 Calculate No of Lighting Fixtures / Lumens for Indoor Lighting 182
59 Calculate Street Light Pole Distance &Watt Area 183
60 Calculate Short Circuit Current (Isc) 184
61 Calculate Size of Bus bar for Panel 189
62 Calculate Size of Cable Tray 193
63 Calculate Size of Diesel Generator Set 195
64 Calculate Size of Main ELCB & Branch MCB of Distribution Box 198
65 Calculate Size of Solar Panels 203
66 Calculate Size of Inverter & Battery Bank 205
67 Calculate Cable Trunking Size 209
68 Calculate Size of Conduit for Cables / Wires 210
69 Calculate Cable Voltage Drop for Street Light Pole 211
70 Calculate Lighting Protection for Building / Structure 214
www.electricalnotes.wordpress.com |4
