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INSULATOR FITTINGS FOR OVERHEAD

IS 2486 ( Part 2 ) : 1989

POWER LINES WITH NOMINAL VOLTAGEGREATER THAN 1000 V - SPECIFICATIONPART 2 DIMENSIONAL REQUIREMENTS

( Second Revision )

July 1990 Price Group 10

First Reprint JUNE 19 9.5

UDC 62131565 : 621315171 : 00678

.

0 BI S 1990BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

( Reaffirmed 1994 )

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Electrical Insulator and Accessories Sectional Committee, ETDC 3

FOREWORD(Second Revision) was adopted by the Bureau of Indian Standards onthe draft finalized by the Electrical Insulators and Accessories SectionalCommittee had been approved by the Electrotechnical Division Council.

This Indian Standard22 August 1989, after

The insulator fittings for overhead power lines are generally the insulator pins, ball and socketconnections, clevis and tongue connections, cross arm straps, etc. The dimensions of such fittingshave been covered in this standard.This standard was first issued in 1963. The first revision was_ carried out in 1974 to includedimensions of one more size of ball and socket connections. .The requirements and dimensions ofsecurity clips were covered separately in Part 3 and Part 4 of IS 2486. In this second revision, therecommended dimensions of insulator string fittings rated above 725 kV have been included fromIS 10136 : 1982 so as to bring information at one place.The Sectional Committee responsible for the preparation of this standard is of the view that the listof fittings for which the dimensions have been given is by no means exhaustive and it would benecessary to add to it as and when the need arises.The general requirements, materials and tests for these metal fittings are covered in IS 2486(Part 1) : 1971. The requirements of locking devices for these metal fittings are covered inIS 2486 (Part 3) : 1974 and IS 2486 ( Part 4) : 1981.The insulators for which these fittings are meant are covered in IS 731 : 1971 and IS 3188 : 1980.The insulator fittings for overhead distribution lines up to 1 000 V are covered in IS 7935 : 1975.In the preparation of this standard considerable assistance has been deri\,ed from the followingpublications:

IEC Pub 120 ( 1984) Dimensions of ball and socket couplings for string insulator units -International Electrotechnical Commission ( IEC).IEC Pub 438 ( 1973 ) Dimensions of clevis and tongue couplings for string insulator ul?ils -International Electrotechnical Commission ( IEC ).BS 3288 Part 2 : 1977 Insulator and conductor fittings for overhead power lines - BritishStandards Institution ( UK >.

For the purpose of deciding whether a particular requirement of this standard is complied with thefinal value, observed or calculated, expressing the result of a test. shall be rounded off in accordancewith IS 2 : 1960 Rules for rounding off numerical valves (rev;.&). The number of significantplaces retained in the rounded off value should be the.sa-me as that of the specified value in thisstandard.

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Indian StandardINSULATOR FITTINGS OR OVERHEADPOWER LINES WITH NOMINAL VOLTAGE

GREATER THAN 1000 -SPECIFICATION

IS 2486 ( Part 2 ) : 1989

PART 2 DIMENSIONAL REQUIREMENTS

( Second Revision )1. SCOPE 5 INSULATOR FITTINGS FOR PIN INSU-LATORS AND STRING INSULATOR UNITS1.1 This standard (Part 2 ) gives the dimensionsof the insulator fittings and their associated gaugesfor use on overhead power lines with a nominalvoltage greater than 1 000 V.

5.1 The requirements relating to shape anddimensions of fittings specified in 6, 7 and 8 shallbe complied to achieve interchangeability ofinsulator fitting.2 REFERENCE STANDARDS2.1 The Indian Standards listed in Anntx A arenecessary adjuncts to this standard.

6 INSULATOR PINS6.1 Line and Pilot Pins6.1.1 Heads

3 TERMINOLOGY3.1 For the purpose of this standard, the defini-tions given in IS 1885 (Part 54) : 1980 andIS 2486 (Part 1) : 1971 shall apply.

The heads shall be of steel and shall be inaccordance with Fig. 1. They shall screw into athimble or equivalent component fixed in the pinhole of the insulator. The dimensions of the gaugesfor these heads are given in Fig. 2 to 4.

4 MATERIALS AND REQUIREMENTS 6.1.2 Pins4.1 1Jnless specified otherwise, the materials ofmetal parts of insulator shall be as specified inIS 2486 (Part 1) : 1971.

The dimensions of the line pins shall be as givenin Fig. 5 and 6. The pilot pins shall have thedimensions according to Fig. 7.

1A Small Steel Head 1B Large Steel Head( Reference S ) ( Reference L )All dimensions in millimetres.

FIG. 1 PIN HEADS

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IS 2486 ( Part 2 ) : 1989 - . I \

+.

Ic-I \ \ . t ,I.__-NOMINAI.NHUM r I cMAXIMUM I itt ; l-1:ttt I tI

All dimensions in miilimetres.Frc;. 2 GENERAL CONFIGURATION OF GAUGE FOR HEADS OF INSULATOR PIN

Sze of Head A B C D E F G IISmall (see Fig. 1A ) 44 1829 2337 508 168 119 168 333Large ( see Fig. IB ) 47 2778 3096 600 173 175 173 348NOTE - The dimension X-Y is the base of the conic frustum which determines the root depth of the threads.For general configuration of gauge, see Fig. 2.

All dimensions in millimetres.FIG. 3 SCREW GAUGES FOR STEEL HEADS

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KS 2486 ( Part 2 ) : 1989

OF HEAD

Size of Head A B CSmalt ( see Fig. 1A ) 44 1829 2337Large ( see Fig. 1B ) 47 2778 3096

NOTE -- The dimension X-Y is the base of the conic frustum which determinzs the taper of the gauge.All dimensions in millimetres.

FIG. 4 RING GAUGES FOR STEEL HEADS

MinimumFailhg Load(kN)5(P)

Reference A B C D P F G X

s115q 115 33 24 24 20 5 12) 50S165P 165 40 24 25 20 5 12) orS23OP 230 40 24 29 24 6 12 1 150

lo(n) Sll5N 115 40 24 29 20 6 121 50

S165N 165 45 24 32 20 6Of

S230N 230 50 24 38 24 6 122 150*Dimension X to be 150 mm (screwed 100 mm ) or 50 mm (screwed 45 mm ).NOTES1 In the references given above, S indicates that the steel tiead is small followed by the stalk len$th in millim:treswhich in turn is followed by the minimun failing load denoted by P ( 5 kN ) or N ( 10 kN ).2 The tolerances, if necessary, shall be agreed between the purchaser and the manufacturer.

All dimensions in millimetres.FIG. 5 PINS WITH SMALL STEEL HEADS

3

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IS 2486 ( Part 2 ) : 1989

MinimumFailing Load(kN)5(P)

10 (NJ

Reference A B C D E I; G

L165P 165 40 24 25 20 5 121L23CP 230 40 24 29 24 6 12)L3OOP 300 50 24 35 24 6 12;L165N 165 45 24 32 20 6 127L230N 230 50 24 3s 24 6 121L3OON 300 61 27 44 24 6 121

A*

50Old

15050or

150*Dimension X to be 150 mm (screwed 100 mm ) or 50 mm ( scrcw~d 45 mm ).NOTES1 In the references given above, L indicates that the steel head is large followed by the stalk lengih in millimetreswhich in turn is followed by the minimum failing loaddenoted by P ( 5 kN ) or N ( 10 kN ).2 The tolerances, if necessary, shall be agreed between the purchaser and the manufacturer.

All dimensions in millimetres.FIG. 6 PINS WITH LARGE STEEL HEADS

/SMALL ORLA!?GE STEELHEAO(FOR DETAILS

All dimensions in millimetres.FIG. 7 PILOT PIN

4

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IS 2486 ( Part 2 ) : 1989of the metal base. The effective thread of the50 mm shank shall be not less than 45 mm andthat of the 150 mm shank not less than 100 mm.6.3 Pin StrengthsThe minimum failing loads of the insulator pinsshall be as follows:

TYPOLine pinsPilot pinsStud pins

Minimum Failing Load(kN)

5 and 1007IO ( when assembledwith its insulator)

NOTE -The reduction in the minimum mechanicalfailing load spccificd above for lins pins is undclconsideration. The mechanical failing load may bcreduced to suit the specific requirements as agreedbetween the manufacturer and the user till such timethe revised values are finalized.

6.1.2.1 StaIksThe stalk length of line pins (dimension A inFig. 5 and 6 ) shall be measured above theseating face of the collar. In pilot pins (Jee Fig.7), this length shall be measured above thebottom face of the top nut.6.1.2.2 ShanksThe shank length of the line pins (dimension Ain Fig. 5 and- 6) shall be measured below theseating face of the collar. In pilot pins (seeFig. 7 ), this length shall be measured below thebottom face of the top nut.The effective thread of 50 mm shank, hall benot less than 45 mm and that of a 150 mm shank,not less than 100 mm. The term effective threadshall mean that the thread, after galvanizing orafter being given any other suitable anti-corrosionprotection, shall take a nut for the distance stated.NOTE. On steel cross-arms, the pins are securedwith spring washer artd nut and on wooden cross-armswith plain washer, nut and lock-nut.

6.1.2.3 TlveatlsThe threads on the shank and the nut shall be asspecified in IS 4218 ( Part 2 ) : 1976.6.1.2.4 NutsThe dimensions of hexagonal nuts shall bein accordance with IS 1363 ( Part 3 ) : 1986.6.2 Stud PinsThe shank of the stud pin shall have a diameterof 20 mm and the lengths of 50 or 150 mm. Thelength shall be measured below the seating surface

Pin Bal l 411 mm 11.9+00-1l16 mm so.0170_,.220 mm 21.0+oo-1324 mm 25.0+oo-14

7 STRING INSULATOR FITTINGS7.1 Ball and Socket Connections7.1.1 The nominal dimensions of the 11, 16, 20and 24 mm pin ball and socket interior shall beas shown in Fig. 8 and 9.

NOTE -The cxtel-nal dimensions of the sockethou\;ng have not been specified, and these are left tothe manufacturer. Conformity to the hook-on 'GO'gauges (see Fig. 10) ensures that the socket housingfrom one rranufacturer will cot foul any part of aninsulator supplied by another.

7.1.2 The gauges for pin ball and sockets shallconform to the figure numbers given in Table 1.

dr rl22.8:y.i 9.1+ 00-12 3533.3+oo-15 13.4+_7:; 2341.0+oo-16 19.5+0.0-14 2749*0fy:i 21.0+oo-17 40

All dimensions in millimetrss.FIG. PIN BALL

r135506070

r335305766

t-415303540

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I S 2486( Part 2) : 1989

Socket D1

11 mm 12.5;~::16 mmAlternative A !9.2+;:;16 mmAlternative B 19.2;::;20 mm -00230+2.124 mm 275+2.50.0

D2 & H, H,(M in ) ( Mi n ) (Min)245 245 io.s;y:; 155345 315 -00145+l.6 20 534 5 345 -0.0l70+ I.6 350425 425 205 r;:: 285510 510 23.5;;:; 325

t-il2-- - D3

3523237740

4 15 4 483 3 5 553 3 5 7.96 35 7 705 4 10 87

*T = Thickness of locking device (see IS 2486 ( Part 3 ) : 1974 ).All dimensions in millimetres.

FIG. 9 SOCKET

Table 1 Gauges for Pin Ball and Sockets( Clciuse 7.1.2 >

Gauges Fig. No.Hook-on Go gauge 10Go gauge for pin ball height, shank diameter and shank length 11Go gauge for pin ball diameter 12Not Go gauge for pin ball height 13Not Go gauge for pin ball diameter 14Not Go gauge for pin shank diameter 15Go gauge for socket entry height, entry width and neck width 16Go gauge for socket internal height and internal diameter I7Not Go gauge for socket entry heightNot Go gauge for socket neck width

NOTES

1819

1 The Go gauges have an allowance for wear and manufacturing tolerance for the gauge which falls withinthe tolerance zone for the part. If desired, the manufacturing tolerance for the gauge may be measured andthe wear allowance correspondingly reduced. The gauges should be discarded when they have worn to thedimensions given for worn gauges.2 The Not Go gauges have a manufactufing tolerance symmetrically disposed about the tolerance limit forthe part and have no wear allowance.

6

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I S 2486 Part 2 ) : 19897.1.3 Dimensions of twin-balled pins for coupling 7.3 Cross-Arm Strapof two socket ends are given in Fig. 20. The dimensions of cross-arm strap shall be as7.1.4 Clearance and locking conditions as well as shown in Fig. 26.the extreme position of the pin ball in the socketend are given in Fig. 21 to 24. 8 STRING INSULATOR UNIT FITTINGSFOR SYSTEM VOLTAGE 725 kV AND7.2 Clevis and Tongue Connection ABOVEThe dimensions of the clevis and tongue connec- 8.0 The shape and dimensions covered in 8.1tion shall be as shown in Fig. 25. to 8.13 are recommended values and for the purposeof guidance only. An agreement may be reached

NOTF - The ex~erral dimencinnq of the clevis have_ - __._ _._. . -. -._.._.._. .._ between the purchaser and the manufacturernot been given and these are left to 1He manufacturer. on this account.

Gnuge

11111111D, D, D, & H, H, Ha R, R, R, & R, &

[Max 12O0O 22950 25322 6015 9250 11715 23711 35075 35075 3631 1450 4910 2804 Now 11980 22920 25348 5995 9220 17860 23860 35060 35060 3616 1460 4980 2 70: M n 11960 22890 25374 5975 9190 17945 23915 35,045 35045 3601 1470 49.90 260[Worn 11900 22800 25400 5955 9100 l8%00 24OOO 35T100 35000 3556 1500 SO.00 250

16 mm [ Max 17122 33490 35326 9059 13572 20686 31786 23086 50086 3071 2939 71.70 280Alterna- i None 17096 33450 35351 9039 13536 20768 31868 23068 50068 3055 2952 7180 270tives A ; M ln 17070 33410 35.376 9019 135OO 20850 31950 23050 50050 3039 2965 7190 260and B 1Worn 17OOO 33300 35400 8999 13400 20.900 320OO 23000 50000 2993 3000 7200 250(MUX 21150 41220 45484 12095 19702 25,551 42151 27.101 60101 5845 3.425 8955 345

2o mnNon1 21120 41170 45523 12065 196:6 25678 42278 27078 60078 5824 3440 8970 330

< Mitt 21090 41 120 46561 12035 19610 25805 42.405 27055 60055 5803 3455 8985 315i Worn 21000 41COO 45600 12005 19500 25900 42500 27000 6OTXXl 5753 3500 9006 300[Max 25172 49250 50490 14090 21242 25971 46171 40 121 70121 6732 3914 10455 345

24 mm { g, 25136 49190 50527 14060 21186 26093 46293 40093 70093 6706 3932 10470 33025100 49130 50564 14030 21130 26215 46415 40065 70065 6680 3950 10485 315i Worn 25OO0 49000 50600 14000 2lOOO 26300 46500 4OOOO 70000 6615 4000 10500 300All dimensions in millimetres.

FIG. 10 HOOK-ON Go GAUGES

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IS 2486 ( Part 2 ) : 1989

Gauge 411 mm

16mm

20 mm

24mm

r M i n 11526N0I?l{ M ax j; !zz1 worr7 11900/- M in 16922i za; g:;;;1 Worn 17000r M i n 20916i iVCV)l 20 928[ Ez, 20.94021000I- g--* ;;:;;j< M ax 24936i_ w orn 25000

22712 25522728 25022744 24522800 24033201 35533222 35033240 34533300 34040900 45540920 45040940 44541000 44048890 50548912 50048934 49549000 490

9,008 24 112:;: 240524059100 240013.304 3214 2295213320 3210 22.96013,336 3206 22,96813.400 3200 23.00019400 4264 2695019415 4260 2695919.436 4256 2696819.500 42 50 27.00020885 46.65 3994420.90s 4661 39,95420.928 4657 3996411000 4650 .mOOO

1134954349623497035ooo

r2349543496234970350004995249960499685000059 950599595996860 00060 944699546996470000

350935173525355629452952295929935703571 I5.7195753

15371532I527I 5003039303430293.0003542353635303,500

6558 4Y446567 40386.577 4036615 4000All dimensions in millimetres

FIG. 11 Go GAUGE IOR PIN BALL HEIGHT, Smx DIAMETER ANI SIIAKK LESCXII

Gaugef Newllmm {[ war/rf New16 mm {c Worn( New20mm {I Worn[ New24 mm {[ Worn

FIG. 12

d,22728 S 001 I2280033223 & 00123330040920 & 00134100048913 i_ 001449ooo

All dimensions in millimetres.Go GAUGE FOR PIN BALL DXAMETER

8

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IS 2486 ( Part 2 ) : 1989

I----&--i

24 mm { NattlIi_ Max

Gauge 4 h.11mm 21.500 f O-011 100 f @516 mm 31.800 If: 0012 120 f 0520 mm 39400 f 0013 180 + OS24 mm 47200 f 0014 200f05

t----d1f \ f pk hbhtt

4 416'08 18601610 18401612 15202366 3032370 3002374 2972836 36328.42 36 02848 3573448 42334.54 4203460 417

412.312.011718318017723.3230227283280277

lh 4 rI r67.884 155 34 992 377900 160 35000 407.916 165 35008 43

12084 215 21992 4712100 220 23000 5012116 225 23008 5318082 295 26991 6718100 30.0 27000 7018118 305 27009 7319280 315 39990 7719300 320 40000 8019320 325 40010 83

All dimensions in millimetres.FIG. 13 Nor Go GAUGE FOR PIN BALL HEIGHT

L

h,10 f 03 15 f 0.510 f C3 1.5 f 0510 + 03 1.5 +_ 0510 f @3 15 f o-5

All dimensions in millimetres.FIG. 14 NOT Go GAUGE FOR PIN BALL DIAMETER

9

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IS 2486 Part 2 ) : 1989

I; NOT GO/1

4 (1, I! ,I I mm 10800 + 0,009 150 &- 05 120 2 05 1.0 2 0.316 mm 15800 + 0010 200 rt:05 15.0 2 0.5 10 + 0.320 mm 19.700 * 0012 250 k 05 ;80 +. 05 10 & 0324 mm 23600 &- 0013 300 & 05 230 f 05 10 * 03

Gaugef Max

11mm 4 Nom: MinC Worn16mm !- 2:;Alterna- !tive A i K?,z

20 mm[ MUX

24 mm { $Ti Worn

FIG.

Dl12584125721256012500KzZ192661920019291192801926619200

All dimensions in millimetres.15 Nor Go GAUGE FOR PIN SHANK DIAMETER

R3R5

245902457824566245003460234588345743450034602345883357434500

105961058010564105001460814588145681450017108170881706817ooo

29529040540033539040540.0395390

3504835.040350323500023054230442303423000z:::2303423000

3504835040350335000500.54500445003450000500545004450 03450000

23116 42630 20632 505 27066 6006623098 42610 20606 500 27053 6005323080 42590 20580 495 27040 60,04023.000 42500 20500 49.0 27000 6000027.6302761027.5902750051150 23652 555 40076 7007651126 23622 550 40061 7006151102 23592 545 40046 7004651000 23500 540 4oOQO 7wJ oO

All dimensions in millimetres.

R342242134205417333383325331I3281305130443037300060656055.604560007898788178647821

& R,1458 42221464 42131.470 42051500 41732953 33382960 33252967 33113000 328 I2953 305I2960 30442967 30373000 30003442 55653451 55553460 55453500 55003935 78983945 7.8813955 78644000 7821

FIG. 16 Go GAUGE FOR SOCKETENTRY HEIGHT, ENTRY WIDTH AND NECK WIDTH10

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IS 2486 ( Part 2 ) : 1989

R5!

D11258412572I2 56012500192941928019266192001929419280192661920023116230982308023000

D324590245782456624500

15596155801556415500206082058820568205002510825088250682500028632286062858028500

30530029529040540039539040.540.039.539.050.550.0495490

43504835040350323500023054

35.048350403503235000

RI R,4045 14584.039 14644033 14704000 15003051 2.9533044 2,9603,037 29673000 3000305 I 2953

R54045403940334000

.lfu.sivoruMitrWornn oxNomMitrWornMUXNomMinWornMaxNoruM inWornMax 27.630Nom 27610Min 27590Worn 27500

Ilmm $i

50054500445003450 00050054

3051304430373000

16 mm !-Alterna- -jtive A 1

346023458831574 230442303423XIOO4500

3460234588345743450042630426104259042500

305 I304430373OQO16 mm cAltema- 4,tive B i

230542304423034_. _.5004450034 3044 229968:037 .3000 30003 000 50000

6065 34426055 34516045 34606000 3500

6065605560456000I-20 mm 4I

27066 6006627053 6005327040 6004027000 60.000555 40076 70.076550 40061 70061545 40046 70046540 40000 70000

8,075806380518000

5.075 39355063 39455051 39554mm51150 3265251126 3262251102 32592

5000 40001000 325001All dimensions in mill imetres.

FIG. 17 Go GAUGE FOR SOCKET INTERNAL HEIGHT AND INTERNAL DIAMETER

11

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IS 2486 ( Part 2 ) : 1989

GaugeII mm

16 mmAlttrnative A16 mmAlternative B

20 mm

24 mm

D,(Max 109{ Nonz 108lMin 107(Max 1594 Nom 1.58[Mitt 157[Max 159< Nom 158(Mijr 157(Max 19.8

-j Nom 197(Min 196[Max 237( NOHI 2361Mitr 235

1705 123 11816 3@51700 120 11800 3001695 117 11784 395301 183 16120 405300 180 16100 400299 177 16080 395301 183 18620 405300 180 18600 300299 177 18580 395361 233 22626 505360 230 22600 500359 227 22 574 495421 283 26030 555420 280 26000 5.50419 277 25970 545

RI H?35008 35,00535000 3500034992 3499223010 500 IO23OOO 5000022990 4999023010 5001023000 5000022990 4999027013 6001327000 6000026987 5998740015 70.01540000 7000039.983 69985

All dimensions in mill imetres.FIG. 18 NOT Go GAUGE FOR SOCKET ENTRY HE IGHT

Gauge11 mm16 mm AlternativesA and B20 mm24 mm

Dl H.5 H613800 .& 0011 300 + w5 10 f 0320800 f 0014 40.0 f 05 1.0 + 0325.100 f 0.018 500 + 05 1.0-C 0330.000 + 0020 550 4 05 1.0+0.3

H5

4181512333027333027383532434037

All dimensions in mill imetres.FIG. 19 NOT Go GAUGE FOR SOCKET NECK WIDTH

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tS 2486 ( Part 2 ) : 1989

Size( i k )

11 nil 11 47,0+0:0-2 516 mm 63.0+;:;20 mm 83.0+00-3223 mm 90.0 +0:0-35

FIG. 20 TWIN-BALLED PIN

Size b---d D,--d, & -A Pr-__A_.-T M i t l M in r--_h__.TM i t t M U M i t z M ax

1 mm 06 30 17 17 14 3916 mm Alternative A 22 50 12 12 11 4016 mm Al ternativ e B

15 10 4523111111 25 64 20 20 25 67Clearance between the pin ball and locking device.

All dimensions in millimetres.FIG. 21 CLEARASCEBETWEENPIN BALL AND SOCKET END

Q*M i t l! 616372028

Size

11mm16 mm Alternative A16 mm Alternative B20 mm24 mm

FIG. 22 EFFECTIVENESS F13

SM in(mm)0915142.520

LOCKING THE PIN BALL

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IS 2486 ( Part 2 > : 1989

i

Size %o.4u?ruge11 mm 1316 mm AltcrratixeA 4016mm Alternative B 4020 mm 3324 mm 27

FIG. 23 SLIDING POSITION OF THE PIX BALL 1~ THE SOCKIX Em

11 mm16 mm Alternative A16 mm Alternative B20 mm24 mm

*pO values assume reasonable tolerance for Ha.FIG. 24 OVER-TILTING Pow~os OF TIIE PIN

B *Average1295

129

IO

BALL IS THE SOCKETEND

All dimensions in millimetres.FIG. 25 CLEWS AND TONGUE CONNECTION

14

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I:3 2486 Part 2 : 1989

I-- I__ H 44 mm DIA ----,;c-- A ------:&.- I 7Ml6 THREADS

A IT C D*diai W 16 140 35

7, 16 115 3s* rhc b:rip of I:jz!;cr v, iilth may bc used by agreement with the user.

All dimensions in millimctrcs.FIG. 26 CROSS-ARM TRAPS

E H

6 1456 120

8.1 Ball Hook 8.2 Anchor ShackleThe shape and dimensions of the ball hook are The shape and dimensions of the anchor shackleshown in Fig. 27. are shown in Fig. 28.

Di w mions Fin Ball Designation*r __h_-_T See Fig. 9 for size of 16 mm Alternative BI203 95203 95203 95

2938 ; t21 : ; 1> See Fig. 9 for size of 20 mmjl6 mm Alternative B2231A Double Horn Holder Type ( Suitable for 20 mm/l6 mm, Alternative B Socket )

A

129129129129129129129129129146

Dimension, mm Socket SizeB

2929::1:48515732

1752117517.517517517517.517.521

See Fig. 9 for size of16mm Alternative A

-Uhimate Stretigrh

kd

12000

31 B Double Horn Holder Type ( Suitable for 16 mm, Alternative A Socket )FIG. 31 SOCKET-TONGUE ( DOUBLE HORN HOLDER TYPE )

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IS 2486 Part 2 ) : 1989

Comhtctor D ia. mm_---- h-__-7Mill MUX7.6 178127 211iii3 292254 389300 419381 508432 57250.8 635

127 259229 356279 411318 470356 508444 57.2508 G48

Dinzensiorrs, mm Socket Sizef------- h-_---TA B C D181 605 19 16 7190 635 22203 700 32 :z I228 85.5 42241 825 45254 1015 54280 1015 6079 1080 67

16l6 j. See Fig. 9 forI size16 mm Alternative G:z16 j

203 665 27 16 I222 715 37 16 I241 855254 :: 16890 j16 1 See Fig 9 for six 20 mm:16 mm267 920 Alternative R279 1015 2 fZ0.5 1110 70 16 J

FIG. 32 SUSPENSIONCLAMP

Dimensiorrs, mm Pin Ball Designation*r--------- h___-_--,-TA B C D

102 51 19 127 20 mm/16 mm114 63 5 22 160 20 mm/16 mm114 635 25 19-o 20 mm/l 6 mm*SeeFig. 8.

FIG. 33 BALL-EYE19

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IS 2486 Part 2 ) : 1989

Dimensions, mmC__-_-__-_--h__------_~A B C D E

See Fig. 8.

16 19;; :4 22S19 25 22

FIG. 34 BALL-CLEVIS

C-CL,L_ -2__ __

8

!E

Pitt Ball Desigttatiott

16 mm20 mm/ I6 mm20 mm/16 mm20 mm/16 mm

Fig. 35 (a)

Fig. 35 (b)Figure Dimensions, mm bcket Sizer-------- h--------~A B c D E

19 :: 322 :; :f :; 109 114$1 38: 2299 19:

\ See Fig. 9 for29: : 1

size 1611414

mm AlternativeB

$j 1:: :;b) 114 38W 114 38

19i :: ;: See mm9 sizq: 20 mmj1625 19

29 i Altematiyig. 0 for@29 j

FIG. 35 SOCKET-CLEWS20

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IS 2486

w E

Dimensions, mmr----------- *_--_--_--_--_-_-_-_~A c D E43 330 17.5 1678 330 175 1691 330 21 1991 356 24 22

FIG. 36 YOKE PLATE

Dimensions,mmr---------- _h____-_---_--_-_~A B c D

75 32 19 1615 32 22 1675 32 24 1685 38 27 16

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IS 2486 ( Part 2 ) : 1989

Maleri a I

Malleablei ran

Aluminiumalloy

TYPE A

TYPE B

TYPCof CorrductorDiameter Dimensions~----L----*------.-_--Clamp r--Min~--_ AMax,r ;;f 21 64 : 25421 6 318I 244 356

139213279325178216254300381

3112 12704128 20324953 25405652 254018732746c%

20322921355638102222330 2.412849535652f %238133024636

B

1076152420322286254014922032260432703810

c222286318381175222302349222254286318413190190222286349

D1591591901901591591901901616:&I1901616:619-o

R968160-3200020329521365187320647621143158824132540698952120.615562064

All dimensions in millimetres.FIG. 38 STRAIN CLAMP

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IS 2486 ( Part 2 ) : 1989PLUG ALUMINIUM BODY

BEFORE STEEL EYE

ACSR Cortdi~cto,____---* -----~Standard Stranding andNominal Wire DiameterCopper r----A------Area Alumi- Steelnium

65 614728: 615282612 5480 3012351:: 301259301279

13040 :;;:z160185 :x;::::225 301399%

301427541318300

:z ::i;.::5d3G3

71157 391 196 15371190 431 222 17071190 431 222 1707i2.36 440 222 1777/259 465 234 1937/279 465 234 20871300 510 266 22271318 510 266 23571335 573 284 24871371 579 284 27471399 624 301 29371427 659 317 31371318 629 317 29871450 659 317 32971335 659 317 31571353 659 333 332

DimensionsA B c E F H Z K

2252603co29429432932938.1381316450450450450468

:o: :so05050z60zt606060

12 .12 z.612 6018 87:;:8 8818 9418 .20 1z.z24 11524 124:: 133

9924 14024 10524 110

Size andNunlberof Bolts

104 Ml212104 M12!2104 M12!2139 M12/2156 Ml212156 Ml212173 Ml612173 Ml612191 Ml612208 Ml612225 M12,4242208

Ml214260 Ml214Ml214242 M12/4208 M12,4

All dimensions in mill imetres.FIG. 39 STRAIN CLAMP ( COMPRESSION TYPE )

Dimensions, mm

19 2119 21CLEW-T NCWE

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IS 2486 ( Part 2 ) : 1989E

____-Trr-=1__.__E-Dinrcnsions, mm--- _-_-__- -----*- --------~---------\A B C D E F G

76 102 127 152 16 175 2276 102 127 152 19 21 2989 114 140 162 22 24 32

FIG. 41 SAG ADJUSTER PLATE

All dimensions in millimetres.Plate 20 mm thick

Tolerance f 3 percent4ZA Alternative 1

FIG. 42 SAG ADJUSTER PLATE- Cpnrd

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IS 2486 ( Part 2 ) : 1989

250I----------- I

All dimensions in millimctrcs.External Hole 4 2 I4Plate 12 mm thick

Tolerance & 5 percent42B Alternative 2

FIG. 42 SAG ADJUSTERPI-ATE

ANNEX A( Clause 2 )

LIST OF REFERRED INDIAN STANDARDSIS No.

IS 731 : 1971

IS 1363(Part 3) : 1984

IS 1885

T i t l e I S No.Porcelain insulators for over- (Part 3) : 1974head power lines with anominal voltage greater than

(Part 4): 19811 000 V ( second r evi sion ) IS 3188 : 1980Hexagon head bolts, screwsand nuts of product grade C: IS 4218Part 3 Hexagon nuts (size (Part 2) : 1976range M5 to M36) (secondrevi sion ) IS 7935 : 1975Electrotechnical vocabulary:(Part 54) : 1980 Part 54 Insulator

IS 2486 Insulator fittings for overhead(Part 1) : 1971 power lines with a nominal IS 10136 : 1982voltage greater than I 000 V :Part I General requirementsand tests (first revi sion )

T i t l ePart 3 Locking devicesPart 4 Tests for locking devicesCharacteristics of string insu-lator units (first revi sion )IS0 metric screw threads:Part 2 Diameter pitch com-binations (.f?rst revi sion)Insulator fittings for overheadpower lines with a nominalvoltage up to and including1000 vCode of practice for selectionof disc insulator fittings forhighest system voltages of725 kV and above

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Bureau of Indian Standardsis a statutory institution established under the Bureau ofIndian Standards Act, 1986 toharmonious development the activities standardization, marking quality certification goodsand to connected in the

CopyrightBIS the copyright all its No part these publications be reproduced anyform the prior in writing BIS. This not preclude free use, the courseimplementing the of necessary such as and sizes, or gradetions. Enquiries to copyright addressed to Director ( ), BIS.

of IndianAmendments are to standards the need on the of comments. are alsoperiodically; a along with is reaffirmed such review that noare needed; the review that changes needed, it taken up revision. Users IndianStandards ascertain that are in of the amendments or by referringthe latest of BIS and Standards Additions.This Standard has developed from DOC : NO. ETDC 3 ( 2774)

Amend No. Amendments Issued Since PublicationDate of Issue Text Affected

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