Minimum Electrical Clearance

Minimum Electrical Clearance As Per BS:162.

INDOOR
Voltage in KV	Phase to earth in mm	Phase to phase in mm
0.415	15.8	19.05
0.600	19.05	19.05
3.3	50.8	50.8
6.6	63.5	88.9
11	76.2	127.0
15	101.6	165.1
22	139.7	241.3
33	222.25	355.6

Minimum Electrical Clearance As Per BS:162.

OUTDOOR
Voltage in KV	Phase to earth in mm	Phase to phase in mm
6.6	139.7	177.8
11	177.8	228.6
22	279.4	330.2
33	381	431.8
66	685.8	787.4
110	863.6	990.6
132	1066.8	1219.2
220	1778	2057.4

Minimum Working Clearance:

OUTDOOR SWITCHYARD
Voltage in KV	To ground in mm	Between section(mm)
11	2750	2500
33	3700	2800
66	4000	3000
132	4600	3500
220	5500	4500

Minimum Ground Clearance As Per IE-1956(Rule 77)

Voltage in KV	To ground in mtr
132	6.10
220	7.00
400	8.84
800	12.40

Minimum Clearance between Lines Crossing Each Other (IE-1957)

System Voltage	132KV	220KV	400KV	800KV
Low & Medium	3.05	4.58	5.49	7.94
11-66KV	3.05	4.58	5.49	7.94
132KV	3.05	4.58	5.49	7.94
220KV	4.58	4.58	5.49	7.94
400KV	5.49	5.49	5.49	7.94
800KV	7.94	7.94	7.94	7.94

Minimum Height above Railway As Per IE-1957

Voltage	Broad Meter & Narrow Gauges
Above 66KV up to 132KV	14.60 Meter
Above 132KV up to 220KV	15.40 Meter
Above 220KV up to 400KV	17.90 Meter
Above 400KV up to 500KV	19.30 Meter
Above 500KV up to 800KV	23.40 Meter

Various Air clearances to be provided as per IE rule 64

Voltage KV	33KV	66KV	110KV	220KV	400KV
BIL (Kvp)	170	325	550	1050	1425
P-E (cm)	30	63	115	240	350
P-P(cm)	40	75	135	210	410
P-G (Meter)	3.7	4.0	4.6	5.5	8.0
Section Clearance(Mt)	2.8	3.0	3.5	4.3	6.5

Clearances from Buildings of HT and EHT voltage lines IE Rule 80

Vertical Distance
High voltage lines up to 33KV	3.7 Meter
Extra High Voltage	3.7 Meter + Add 0.3 meter for every additional 33KV
Horizontal clearance between the conductor and Building
High Voltage Up to 11 KV	1.2 Meter
11KV To 33KV	2.0 Meter
Extra High Voltage	2.0 Meter + Add 0.3 meter for every additional 33KV

Clearance above ground of the lowest conductor As per IE Rule 77

Over head Line Across Street
Low and Medium Voltage	5.8 Meter
High Voltage	6.1 Meter
Over head Line Along Street (Parallel To Street)
Low and Medium Voltage	5.5 Meter
High Voltage	5.8 Meter
Over head Line Without Across or Along Street
Low/Medium /HT line up to 11KV If Bare Conductor	4.6 Meter
Low/Medium /HT line up to 11KV If Insulated Conductor	4.0 Meter
Above 11 KV Line	5.2 Meter
Above 33KV Line	5.8 Meter + Add 0.3 meter for every additional 33KV

Clearance between conductors and Trolley / Tram wires (IE Rule 78)

Low and Medium Voltage	1.2 Meter
High Voltage Line Up to 11KV	1.8 Meter
High Voltage Line Above to 11KV	2.5 Meter
Extra High Voltage Line	3.0 Meter

Clearances from Buildings of low & medium voltage lines(IE Rule 79 )

For Flat roof, Open Balcony, Verandah Roof and lean to Roof
Line Passes Over Building Vertical Clearance	2.5 Meter
Line Passes Adjustment of Building Horizontal Clearance	1.2 Meter
For pitched Roof
Line Passes Over Building Vertical Clearance	2.5 Meter
Line Passes Adjustment of Building Horizontal Clearance	1.2 Meter

Comments

what are the possible causes of cable faults?

नमस्कार मित्रों,आज मैने HT AB CAble फॉल्ट कियुं होता है उसिके बारे में चर्चा करूंगा। आप सभी जानते है कि एचटी एबीसी साइट इंजीनियर के लिए सरदर्दी बन जाती है। जैसे ही लाइन चार्ज करते है कुछ मिनटों या महीनों के बाद फॉल्ट आना पैदा करदेता है। बहुत सारे इंजीनियर तो बोलना शुरू कर देते है कि खराब इनसुलेशन की बजहा से ऐसे फॉल्ट होता है। बहुत सारे रिसर्च और अनुभव के बाद बाद में यही नतीजे में पहुंचा कि जो इस्प्रकर की। 1) अन लोडिंग,स्टोरेज और हैंडलिंग सही से होना चाहिए। 2) टर्मिनेशन किट या ज्वाइंटिंग सही से होना चाहिए। 3) एआर्थिंग सही से होनी चाहिए जैसे कि टर्मिनल की latches एआर्थिग जरूर करना होता है। एक चीज ध्यान देना कि मैसेंजर तार को भी दोनों साइड में एर्थिंग करने की। ऐसे तो मैने ए भी कहूंगा कि हर एक खंबे में मैसेंजर तार को एर्थिग करना चाहिए। Please Subscribe my YouTube channel ⁸ साइट पर केबल ड्रम की अन-लोडिंग, स्टोरेज और हैंडलिंग के लिए दिशानिर्देश जो इस प्रकार की होनी चाहिए। केबल ड्रम की अनलोडिंग या तो क्रेन द्वारा या होइस्ट द्वारा या ट्रक ...

Cable trench specification | Various type of cable trench

Hello friends, I had told in my previous blogging that the current carrying capacity of different UG cables.Today I will tell you how the UG cable is laying and how the cable trench is done with the specification. UG cable is very expensive, about 3-4 times expansive and also laying. But due to many reasons we have to do UG Cable. One of them is because of the reason we have to do UG cable even after being so expensive, is density populated areas where Overhead Network cannot be used. However, the cable should be properly laid because it takes more time to find the fault than the overhead line. Before selecting for laying UG cable, the current carrying capacity, voltage drop and short circuit current of the cable are very important factors which I had written earlier in blogging. Generally the life of the cable is 40-50 years. But Incorrect handling/laying can result in insulation damage and decreases...

concrete pole specification | how to calculate cement, sand and aggregate quantity in concrete

Today I will tell, how PCC pole concreting is done? Before knowing about our topic, let's take a little knowledge about PCC Polls.full form of pcc pole is Plain Cement Concrete pole .There are various types of PCC Pole like 8 mtr 8.5 mtr ,9 mtr .but Now I will discuss about only 8.5 mtr pcc pole. As per Guaranteed Technical Perticulars(GTP) Total Length-8.5 mtr Pit depth-1.5 mtr Working load applied 300 mm from top-180 kg Weight of the pole-415 Kg. Top dimension-90mmx145 mm Bottom dimensions-90mm x 300 mm we have to maintain pit length is 1.5 mtr and pole should be inside pit is L/6 where L is length of the pole. Explained : L=8.5 mtr Pit depth=L/6+0.075(Base plate) Pit diameter =20 inch(0.508 mtr) Let's go to our topic now. How to calculate cement, sand and aggregate quantities for ratio 1:2:4 Pit Size For one cmt cement required -6 bag Our pit volume (dia-0.508 mtr where r-0.254, depth-1.5 mtr) Volume -pie*r2*h =3.14*0.254*0...

Knowledge is power essay

Search This Blog