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   Construction Standards
         

REC has developed the following construction standards for Rural Electrification            works:                      

11 KV Lines

A-1

Protective Guarding Across the Road

A-2

Conductor Formation and Clearances (Lines without Earthwire)

A-3

Conductor Formation and Clearances (Lines with Earthwire)

A-4

Supports (Lines without Earthwire)

A-5

Supports (Lines with Earthwire)

A-6

‘V’ Cross Arm (MS Channel)

A-7

Pole Top Bracket

A-8

Maximum Permissible Spans on Straight Runs (R-1984)

A-9

ACSR Conductors – Voltage Regulation Table (R-1993)

A-10

Arrangement of Conductors at Angle Locations

A-11

Tapping Arrangement – Single Pole tapping

A-12

Tapping Arrangement – Double Pole Structure

A-13

‘V’ Cross Arm (MS Angle)

A-14

Automatic Voltage Booster Installation on 11 KV Line

A-15

Installation of 11 KV Auto-Reclosers on Double Pole Structure

A-16

Conductor formation and clearances of 11 KV 3-phase line in 3-Phase/single phase composite system (Phase-to-Neutral)

A-17

Configuration of Single-Phase line (Phase-to-Neutral) with 8M Poles

A-18

Configuration of Single-Phase line (Phase-to-Neutral) with 7M Poles

A-19

Single Phase tapping (Phase-to-Neutral) from three-phase line

A-20

Single Phase tapping   from single-phase line (Phase-to-Neutral)

A-21

Arrangement at tension locations  

A-22

11 KV Line – Type of PCC Poles for Angle and dead end locations

A-23

Conductor formation and arrangement of guys for 0o to 10o angle locations

A-24

Conductor formation and arrangement of guys for 10o to 60o angle locations (Single Pole Support)

A-25

Conductor formation and arrangement of guys for 10o to 60o angle locations (Double Pole Support)

A-26

Conductor formation and arrangement of guys for 60o to 90o angle locations (Four Pole Support)

A-27

Conductor formation and arrangement of guys for Dead End Locations (Double Pole Support)

A-28

Configuration of Single-Phase line (Phase-to-Phase) with 7.5M Poles

A-29

Single-Phase Tapping (Phase-to-Phase) from Three-Phase Lines (R&B Phases)

A-30

Single-Phase Tapping (Phase-to-Phase) from Three-Phase Lines (Y&R or Y&B Phases)

A-31

Single-Phase Tapping from single-phase lines (Phase-to-Phase)

A-32

Single-Phase, ACSR (Phase-to-Phase system) Voltage Regulation Table

A-33

Single-Phase, ACSR (Phase-to-Neutral system) Voltage Regulation Table

A-34

Maximum Permissible Spans on straight runs with All Aluminium Alloy Conductor (Revised Sizes)

A-35

AAA Conductors Voltage Regulation Table

A-36

FRP Top Hamper for 11 KV Overhead Lines with Polymeric Ferrule

415/240 Volt Lines
B-1

Protective Guarding Across the Road – Horizontal Formation

B-2

Protective Guarding Across the Road – Vertical Formation

B-3

Conductor formation and Clearances – Horizontal Formation

B-4

Conductor formation and Clearances – Vertical Formation

B-5

Supports – Horizontal Formation

B-6

Supports – Vertical Formation

B-7

Pole Top Bracket

B-8

Maximum Permissible Spans for 3-Phase LT Lines (R-1984)

B-9

AAC & ACSR Conductors – Voltage Regulation Table (R-1993)

B-10

Arrangement of Conductor at Angle Locations for Cross Country lines – Horizontal Formation

B-11

Maximum Permissible Spans for LT Single Phase Lines (R-1984)

B-12

Conductor formation and Clearances, 3-Phase, 4-Wire – Horizontal Formation

B-13

Conductor formation and Clearances, 3-Phase, 4-Wire – Vertical Formation

B-14

Conductor formation and Clearances, Single-Phase, 3-Wire – Horizontal Formation

B-15

Conductor formation and Clearances Single-Phase, 3-Wire –   Vertical Formation

B-16

PVC Spacer

B-17

Earth Knob for LT Lines

B-18

Composite Spacer for LT Lines

B-19

Type of PCC Poles for Angle & Dead End Locations

B-20

Conductor formation and arrangement of guys for 0o to 10o angle location (3-Phase, 4-Wire Horizontal Formation)

B-21

Conductor formation and arrangement of guys for 10o to 30o angle location (3-Phase, 4-Wire Horizontal Formation)

B-22

Conductor formation and arrangement of guys for 30o to 60o angle location (3-Phase, 4-Wire Horizontal Formation)

B-23

Conductor formation and arrangement of guys for 60o to 90o angle location (3-Phase, 4-Wire Horizontal Formation)

B-24

Conductor formation and arrangement of guys for Dead-End locations (3-Phase, 4-Wire Horizontal Formation)

B-25

Conductor formation and arrangement of guys for 0o to 10o angle location (3-Phase, 5-Wire Horizontal Formation)

B-26

Conductor formation and arrangement of guys for 10o to 30o angle location (3-Phase, 5-Wire Horizontal Formation)

B-27

Conductor formation and arrangement of guys for 30o to 60o angle location (3-Phase, 5-Wire Horizontal Formation)

B-28

Conductor formation and arrangement of guys for 60o to 90o angle locations (3-Phase, 5-Wire Horizontal Formation)

B-29

Conductor formation and arrangement of guys for Dead End Locations (3-Phase, 5-Wire Horizontal Formation)

B-30

Conductor formation and arrangement of guys for angle and Dead End Locations (3-Phase, 5-Wire Vertical Formation)

B-31

Conductor formation and arrangement of guys for Angle and Dead End Locations (3-Phase, 4-Wire Vertical Formation)

B-32

Details of Street Light Fittings (Incandescent Lamp) for narrow street

B-33

Details of Street Light Fittings (Incandescent Lamp) for normal street

B-34

Details of reflector discs for street light fittings (Incandescent lamp)

B-35

Details of Street Light Fittings (Fluorescent tube)

B-36

415V Lines, 3-Phase, Maximum Permissible Spans on straight runs with All Aluminium Alloy Conductors (AAAC -   revised sizes)  

B-37

240V Lines, 1-Phase, Maximum Permissible Spans on straight runs with All Aluminium Alloy Conductors (AAAC -   revised sizes)

B-38

AAA Conductors – Voltage Regulation Table

11KV Insulators and Fittings  

C-1

Insulator Pin

C-2

Strain Insulator Set – Tongue & Clevis type

C-3

Holding of Conductor on 11 KV Pin Insulator – Straight Run (using Helically formed fitting)

C-4

Holding of Conductor on 11 KV Pin Insulator – Angle Location (using Helically formed fitting)

C-5

11 KV Conductor Dead End Arrangement (using Helically formed fitting)

415/240 Volt Insulator and Fittings

D-1

Pin Insulator

D-2

Forged Insulator Pin

D-3

Shackle Insulators

D-4

Hardware for Type-2 Shackle Insulator

D-5

Hardware for Type-1 Shackle Insulator

D-6

LT Conductor Straight Run and Dead End Arrangement (using Helically formed fittings)

Conductor and Accessories

E-1

Wind Pressure & Temperature Data for Sag Tension Charts

E-2

Sag Tension Chart – AAC 7/2.21 mm (Nominal Aluminium Area –25mm2 )50 Kg/m2 Wind Zone

E-3

Sag Tension Chart – AAC 7/2.21 mm (Nominal Aluminium Area –25mm2 )75 Kg/m2 Wind Zone

E-4

Sag Tension Chart – AAC 7/2.21 mm (Nominal Aluminium Area –25mm2 )100 Kg/m2 Wind Zone

E-5

Sag Tension Chart – AAC 7/3.10 mm (Nominal Aluminium Area –50mm2 )50 Kg/m2 Wind Zone

E-6

Sag Tension Chart – AAC 7/3.10 mm (Nominal Aluminium Area –50mm2 )75 Kg/m2 Wind Zone

E-7

Sag Tension Chart – AAC 7/3.10 mm (Nominal Aluminium Area –50mm2 )100 Kg/m2 Wind Zone

E-8

Sag Tension Chart – ACSR 7/2.11mm (Nominal Aluminium Area –20mm2 )50 Kg/m2 Wind Zone

E-9

Sag Tension Chart – ACSR 7/2.11mm (Nominal Aluminium Area –20mm2 )75 Kg/m2 Wind Zone

E-10

Sag Tension Chart – ACSR 7/2.11mm (Nominal Aluminium Area –20mm2 )100 Kg/m2 Wind Zone

E-11

Sag Tension Chart – ACSR 7/2.59mm (Nominal Aluminium Area –30mm2 )50 Kg/m2 Wind Zone

E-12

Sag Tension Chart – ACSR 7/2.59mm (Nominal Aluminium Area –30mm2 )75 Kg/m2 Wind Zone

E-13

Sag Tension Chart – ACSR 7/2.59mm (Nominal Aluminium Area –30mm2 )100 Kg/m2 Wind Zone

E-14

Sag Tension Chart – ACSR 7/3.35mm (Nominal Aluminium Area –50mm2 )50 Kg/m2 Wind Zone

E-15

Sag Tension Chart – ACSR 7/3.35mm (Nominal Aluminium Area –50mm2 )75 Kg/m2 Wind Zone

E-16

Sag Tension Chart – ACSR 7/3.35mm (Nominal Aluminium Area –50mm2 )100 Kg/m2 Wind Zone

E-17(PT-I)

Sag Chart - ACSR 7/4.09mm (Nominal Aluminium Area –80mm2 )50 Kg/m2 Wind Zone 

E-17(PT-II)

Tension Chart - ACSR 7/4.09mm (Nominal Aluminium Area –80mm2 )50 Kg/m2 Wind Zone

E-18(PT-I)

Sag Chart - ACSR 7/4.09mm (Nominal Aluminium Area –80mm2 )75 Kg/m2 Wind Zone 

E-18(PT-II)

Tension Chart - ACSR 7/4.09mm (Nominal Aluminium Area –80mm2 )75 Kg/m2 Wind Zone

E-19(PT-I)

Sag Chart - ACSR 7/4.09mm (Nominal Aluminium Area –80mm2 )100 Kg/m2 Wind Zone

E-19(PT-II)

Tension Chart - ACSR 7/4.09mm (Nominal Aluminium Area –80mm2 )100 Kg/m2 Wind Zone

E-20(PT-I)

Sag Chart - ACSR Conductor 6/4.72mm (Al.)+7/1.57mm (St.) (Nominal Aluminium Area –100mm2 )50 Kg/m2 Wind Zone  

E-20(PT-II)

Tension Chart – ACSR Conductor 6/4.72mm (Al.)+7/1.57mm (St.) (Nominal Aluminium Area –100mm2 )50 Kg/m2 Wind Zone

E-21(PT-I)

Sag Chart - ACSR Conductor 6/4.72mm (Al.)+7/1.57mm (St.) (Nominal Aluminium Area –100mm2 )75 Kg/m2 Wind Zone 

E-21(PT-II)

Tension   Chart – ACSR Conductor 6/4.72mm (Al.)+7/1.57mm (St.) (Nominal Aluminium Area –100mm2   )75 Kg/m2 Wind Zone 

E-22(PT-I)

Sag Chart - ACSR Conductor 6/4.72mm (Al.)+7/1.57mm (St.) (Nominal Aluminium Area –100mm2 )100 Kg/m2 Wind Zone

E-22(PT-II)

Tension   Chart – ACSR Conductor 6/4.72mm (Al.)+7/1.57mm (St.) (Nominal Aluminium Area –100mm2 )100Kg/m2 Wind Zone

E-23

Sags for Stringing

E-24

Return – Wave Method for Checking Sag

E-25

Wind Load on Conductors in Different Wind Regions

E-26

LT & 11KV Lines Crimped Tension Joints for AAC/ASCR

E-27

Crimped Joint for   LT Service Connection

E-28

LT Service Connector (for service connections up to 7.5KW i.e. 10HP)

E-29

Application of Epoxy Compound on T-Joints for LT Service Connections

E-30

Bimettalic Connector (H.T.) for 11KV Distribution Transformers

E-31

Hellically Formed Fittings – Lashing Rods

E-32

Hellically Formed Fittings – T- Connector

E-33

Hellically Formed Fittings   Splice for ACSR Joint

E-34

Suspension Clamp and fittings for ABC System

E-35

Dead End Clamp and fittings for ABC System

E-36

Non-tension LT Connectors for Tapping of Lines and Service Connections for ABC System

E-37

Hot Line Clamp for connecting single phase transformers to 11 KV line

E-38

Non-tension LT Connectors for tapping of lines and service connections for conventional system

E-39

Crimped Joint for LT Service Connection

E-40

415/240V lines, Aerial Bunched Cables current carrying capacity

E-41

Sag-Chart – AAAC 7/2.00 mm (FOS-4.74) (Nominal Aluminium Area – 20 mm2)

E-42

Sag-Chart – AAAC 7/2.00 mm (FOS-4)(Nominal Aluminium Area – 20 mm2)

E-43

Tension Chart – AAAC 7/2.00 mm (Nominal Aluminium Area – 20 mm2) Max. Breaking Load 660 Kg. (FOS-4) 50/Kg/m2 wind zone

E-44

Tension Chart – AAAC 7/2.00 mm (Nominal Aluminium Area – 20 mm2) Max. Breaking Load 660 Kg. (FOS-4) 75/Kg/m2 wind zone

E-45

Tension   Chart – AAAC 7/2.00 mm (Nominal Aluminium Area – 20 mm2) Max. Breaking Load 660 Kg. (FOS-4.74) 100/Kg/m2 wind zone

E-46

Sag-Chart – AAAC 7/2.50 mm (Nominal Aluminium Area – 30 mm2)

E-47

Tension -Chart – AAAC 7/2.5 mm (Nominal Aluminium Area – 30 mm2) Max. breaking load 1031 Kg. 50 Kg./m2 Wind zone.

E-48

Tension-Chart – AAAC 7/2.50 mm (Nominal Aluminium Area – 30 mm2) Max. breaking load 1031 Kg. 75 Kg./m2 Wind zone.

E-49

Tension   -Chart – AAAC 7/2.5 mm (Nominal Aluminium Area – 30 mm2) Max. breaking load 1031 Kg. 100Kg./m2 Wind zone.

E-50

Sag-Chart – AAAC 7/3.15mm (Nominal Aluminium Area – 50 mm2)

E-51

Tension Chart AAAC 7/3.15 mm ( Nominal Aluminium area 50 mm2) Maximum breaking load – 1637 Kg. Wind zone 50kg/m2

E-52

Tension Chart AAAC 7/3.15 mm ( Nominal Aluminium area 50 mm2) Maximum breaking load – 1637 Kg. Wind zone 75kg/m2

E-53

Tension Chart AAAC 7/3.15 mm ( Nominal Aluminium area 50 mm2) Maximum breaking load – 1637 Kg. wind zone 100Kg/m2

E-54

Sag Chart AAAC 7/3.81 mm ( Nominal aluminium Area 80 mm2)

E-55

Tension Chart AAAC 7/3.81 mm ( Nominal aluminium Area 80 mm2)Maximum Breaking load 2394 Kg. Wind Zone – 50 Kg/m2

E-56

Tension Chart AAAC 7/3.81 mm ( Nominal aluminium Area 80 mm2)Maximum Breaking load 2394 Kg. Wind Zone – 75 Kg/m2

E-57

Tension Chart AAAC 7/3.81 mm ( Nominal aluminium Area 80 mm2) Maximum Breaking load 2394 Kg. Wind Zone – 100 Kg/m2

E-58

Sag Chart AAAC 7/4.26 mm (FOS-4) ( Nominal aluminium Area 100mm2)

E-59

Tension Chart AAAC 7/4.26mm ( Nominal aluminium Area 100mm2)Maximum breaking load – 2993 Kg. (FOS-4) 50Kg./m2 wind zone.

E-60

Tension Chart AAAC 7/4.26mm ( Nominal aluminium Area 100mm2)Maximum breaking load – 2993 Kg. (FOS-4) 75Kg./m2 wind zone. 

E-61

Tension Chart AAAC 7/4.26 mm ( Nominal aluminium Area 100mm2)Maximum breaking load – 2993 Kg. (FOS-4)100Kg./m2 wind zone.

E-62

Wind load on Conductors in Different wind Regions for All Aluminium Alloy Conductors (R)

E-63

Tension Chart ACSR 7/2.59 mm (Nominal Aluminium Area) – 30mm2 (150 Kg/M2   Wind Zone

E-64

Tension Chart for ACSR 7/3.35mm (Nominal Aluminium Area) – 50mm2 (150 Kg/M2   Wind Zone

E-65

Tension Chart for ACSR 7/4.09 mm (Nominal Aluminium Area) – 80mm2 (150 Kg/M2   Wind Zone

E-66

Tension Chart for ACSR 6/4.72mm (A1)+7/1.57(St) (Nominal Aluminium Area - 100mm2 150 Kg/M2   Wind Zone)

E-67

Tension Chart   AAAC 7/2.5 mm (Nominal Aluminium Area - 30mm2 Maximum Breaking Load 1031 Kg. 150 Kg/M2   Wind Zone)

E-68

Tension Chart   AAAC 7/3.15mm mm (Nominal Aluminium Area – 50mm2 Maximum Breaking Load 1637 Kg. 150 Kg/M2   Wind Zone)

E-69

Tension Chart AAAC 7/3.81mm mm (Nominal Aluminium Area – 80mm2 Maximum Breaking Load 2394 Kg. 150 Kg/M2   Wind Zone)

E-70

Tension Chart   AAAC 7/4.26mm mm (Nominal Aluminium Area – 100mm2 Maximum Breaking Load 2993 Kg. 150 Kg/M2   Wind Zone)

11 KV/433-250 V Dis tribution Sub-Station 

F-1

Sub-Station with Drop-Out Fuses

F-2

Sub-station with AB Switch and Horn Gap Fuses

F-3

Sub-station ( For on line location) – Along Line

F-4

Sub-station (For on line location) – Across Line

F-5

Location of Earth Pits and Connections

F-6

11 KV Horn Gap Fues

F-7

11 KV Horn Gap Fuses Mounting Details

F-8

LT Multicore Cables (Aluminium) for distribution sub-stations – Recommended Type & Sizes (R-1987)

F-9

11 KV Air Break Switches ( Isolators) for Rural Lines – Recommended Rated Current

F-10

Earthing Arrangement for Distribution sub-station

F-11

Installation of Automatic Transformer Disconnection Switch on 11 KV/433-250 V Distribution Sub-station with Drop out Fuses

F-12

Installation of Automatic Transformer Disconnection Switch on 11 KV/433-250V Distribution Sub-station with HG Fuses

F-13

Single Phase ( phase-to-neutral) distribution sub-station arrangement

F-14

Single Phase transformer mounting details

F-15

3-phase Distribution sub-station using two 11 KV ( phase –to-phase) single phase transformers

F-16

3-phase Distribution sub-station using two 6.35 KV (Phase-to-neutral) single phase transformers.

F-17

Application of Automatic transformer disconnection switch

F-18

LT Single core cables (Alum.) for Distribution sub-stations recommended type and sizes

F-19

Single-phase (phase-to-phase) distribution sub-station arrangement

F-20

Distribution sub-station mounting arrangement of 25 KVA transformer on single pole.

Guying Details

G-1

Guy Assembly (Conventional Arrangement)

G-2

Guy-end Assembly (Using Helically formed fittings)

G-3

Guying Arrangements (Single and Double Guy)

G-4

Guying Arrangements (Fly Guy, Bow Guy and Strut)

G-5

Number of Guys required for different Line Deviations (11KV Line without Earth Wire)

G-6

Number of Guys required for different Line Deviations (11KV Line with Earth Wire)

G-7

Number of Guys required for different Line Deviations (415/240 V Cross Country Line in Horizontal formation).

G-8

Number of Guys required for different Line Deviations (415/240 V line inside localities) Vertical formation.

G-9

Number of Guys required for different Line Deviations (415/240 V line inside localities) Horizontal formation.

Service Connections 

H-1

Single Phase (Insulated Wire)

H-2

Single Phase Meter Board ( Alternative – I)

H-3

Single Phase Meter Board (Alternative – II)

H-4

Three phase Industrial (Bare Wire)

H-5

Three Phase Industrial ( Insulated Cable)

H-6

Three Phase Agricultural

H-7

Three Phase Meter Board ( Alternative – I)

H-8

Three Phase Meter Board (Alternative – II)

H-9

L.T. Capacitors – Recommended Ratings and Mode of connections

H-10

Single Phase Meter Board with MCB Control ( With separate Neutral and Earth)

H-11

Three Phase Meter Board with MCB Control ( with separate Neutral and Earth)

H-12

Service Connection 1-phase Meter Board with Plug-in type MCB

H-13 Service Connection 3-phase Meter Board with Plug-in type MCB

H-14

Internal wiring (in new CD)

Earthing Practice, Safety Devices 

J-1

Coil Earthing

J-2

Pipe/Rod Earthing

J-3

Crossing of Power Lines with Railway Tracks

J-4

Crossing of Power Lines ( Other than LT Vertical Configuration) and Telecommunication lines.

J-5

Crossing of LT Power lines (Vertical Configuration) and Telecommunication lines.

Miscellaneous

K-1

RCC Base/Anchor plate (Using M.S. Rod reinforcement)

K-2

Back Clamp for X-Arm

K-3

Baulk

K-4

RCC Base/Anchor Plate (using 4mm H.T.S. Wire)

K-5

Capitalisation of losses in Distribution   Transformers

33/11 KV Sub-station

L-1

33/11 KV Sub-station Standard Layout (Outdoor 11 KV Switchgear) (R-1993)

L-2

33/11 KV Sub-station Standard Layout (Indoor 11 KV Switchgear) (R-1993)

L-3

33/11 KV Sub-station Metering Arrangement

L-4

11 KV Cables (A1uminium) for 33/11 KV Sub-stations – Recommended Type and Sizes

L-5

11 KV Cross linked Polyethylene (XLPE) Aluminium Cables for 33/11KV Sub-stations – Recommended Sizes

L-6

Protection Scheme for 33/11 KV Sub-station

L-7

Standard Layout for 33/11 KV Low Cost sub-stations (using 11 KV Auto Reclosers) (R-1993)

L-8

Standard Layout for 33/11KV Unattended type Sub-station using two power transformers.

33 KV lines

M-1

‘V’ Cross Arm

M-2

Standard Length/Working Load of Supports and Maximum Permissible Spans (Straight Runs)(R-1984)

M-3

Conductor Formation and Clearances

M-4

Pole Top Bracket

M-5

ACSR Conductors – Voltage Regulation Table (R-1993)

M-6

Protective Guarding Across the Road

M-7

33 KV Lines – Arrangement of conductors at angle locations single pole support (00 to 100 deviation)

M-8

33 KV Lines – Arrangement of conductors at angle locations double pole arrangement(100 to 600 deviation)

M-9

33 KV Lines – Arrangement of conductors at angle locations four pole arrangement (600 to 900 deviation)

M-10

33 KV lines – Tapping Arrangement on single pole.

M-11

33 KV lines (straight runs) with All Aluminium Alloy Conductors (Revised Sizes) Standard length/working load of supports and maximum permissible spans.

M-12

AAA Conductors – Voltage Regulation Table

66/11 KV Sub-station

N-1

 Standard Layout of 66/11KV Unattended Sub-station (Using 11KVAuto Reclosers) 

11 KV Capacitor Installations

P-1

Installation of 11 KV Switched Capacitor Bank with separately mounted C.T. ( with external fuse protection)

P-2

Installation of 11 KV Switched Capacitor Bank with built-in C.T.
(with external fuse protection)

P-3

Installation of 11 KV Switched Capacitor Bank with separately mounted C.T. ( with internal fuse protection)

P-4

Installation of 11 KV Switched Capacitor Bank with built-in C.T.
(with internal fuses)