INSULATOR PINS FOR WOODEN & STEEL CROSS ARMS

1 INSULATOR PINS FOR WOODEN & STEEL CROSS arms MATERIAL : Pin-Drop-Forged STEEL as per either ASTM A575 OR ASTM A576 NUT-as per ANSI Square Washer: As per NEMA PH10, Lock Washer: Hot dip galvanized as per ANSI FINISH: Hot-Dip Galvanized as per ASTM A153 & each pin shall bear the manufacturer symbol/identification mark Strength: Cantilever Test : according to figure-IV, table-C & ANSI Torsion Test: kg-m of torque with tightening rotation of 1800 . Tensile Test: after applying kg-m of torque, it has to withstand minimum tensile load of 1, kg.

2 THREAD: (I) Rolled Thread as per class 2 of ANSI & ANSI & Nut shall be tapped according to ANSI table 8 (II) Lead Thread as per Figure-III & table B. Tolerance: As specified in respective figure or table Dimension: As per Table A , B & mentioned in the Respective figure Test & Inspection: As per ANSI Packing: Each package contains 50 Nos. INSULATOR pin. Origin: Bangladesh FIGURE-I NOTE 1: cm (2-1/4 ) (3/16 ) SQUARE WASHER WITH cm (11/16 ) HOLE CONFORMING TO REQUIREMENT OF NEMA PHI0. NOTE 2: GALVANIZED EXTRA DUTY HELICAL CARBON STEEL SPRING LOCK WASHER AS PER ANSI NOTE 3:LENGTH OF LEAD THREAD SHALL BE cmc (1-3/4 ) ALLOWABLE VARIATIONS a= , b= c= , d= , x=0 (1/64 ) (1/32 ) (1/16 ) (1/8 ) (0 ) A SINGLE LETTER SUBSCRIPT INDICATES THAT THE PLUS AND MINUS VALUES ARE THE SAME; FOR EXAMPLE, Fd = F CM (1/8 ) TECHNO ELECTRICALS LIMITED, UNIT-3 156, Nasirabad Industrial Area, Chittagong-4210 TABLE-A DIMENSION OF INSULATOR PINS FOR WOOD OR STEEL CROSS arms IN CM (INCHES) Height above arm.

3 Length of shank Nominal shank Diameter Diameter of Base Diameter of Shaft Length of Thread Square size Diameter Lead Thread Item No. A B C D E F G H CROSS arm Type Pin type TRB-10 (5) (5-3/4) (5/8) (2) (5/8) (2-3/4) (3/4) (1) Wood Long Shank TRB-940 (5) (1-1/2) (5/8) (2) (5/8) (1-1/4) (3/4) (1) STEEL Short Shank TRB-1220 (10) (7) (3/4) (3-1/2) (1-1/8) (3) N/A (1-3/8) Wood Long Shank TRB-1230 (10) (1-3/4) (3/4) (3-1/2) (1-1/8) (1-1/2) N/A (1-3/8) STEEL Short Shank FIGURE-II NOTE 1: cm (3 )X cm (3/16 ) SQUARE WASHER WITH (13/16 ) HOLE CONFORMING TO REQUIREMENT OF NEMA PHIO.

4 NOTE 2: GALVANIZED EXTRA DUTY HELICAL CARBON STEEL SPRING LOCK WASHER CONFORMING REQUIREMENTS OF ANSI NOTE 3: LENGTH OF LEAD THREAD SHALL BE CMc (2-1/8 ) ALLOWABLE VARIATIONS: a= , b= c= , d= , x=0 (1/64 ) (1/32 ) (1/16 ) (1/8 ) (0 ) A SINGLE LETTER SUBSCRIPT INDICATES THAT THE PLUS AND MINUS VALUES ARE THE SAME; FOR EXAMPLE, Fd = F CM (1/8 ) TECHNO ELECTRICALS LIMITED, UNIT-3 156, Nasirabad Industrial Area, Chittagong-4210 FIGURE-III NOTE 1: THIS IS THE DIAMETER MEASURE BETWEEN THE TAPERED LINES PROJECTED ALONG THE OUTSIDE SURFACE OF THE THREADS AT TOP EXTREMITY OF THE LEAD HEAD. TAPER EQUALS (1/16 ) IN DIAMETER PER CM (INCH) IN LENGTH.

5 NOTE 2: FOUR (4) THREADS PER CM(1 ) TABLE-B DIMENTION OF LEAD THREADS Item No. LEAD HEAD A B C D E F G TRB-10 & 940 CM INCHES 1 5/64 13/16 5/8 3/64 TRB-1220 & TRB-1230 CM INCHES 1-3/8 9/64 1-1/8 3/4 7/64 CM + + + ALLOWABLE VARIATIONS INCHES + + + TECHNO ELECTRICALS LIMITED, UNIT-3 156, Nasirabad Industrial Area, Chittagong-4210 FIGURE-IV NOTE 1: THE ANGLE OF DEFLECTION SHALL BE MEASURED AS THE ROTATION OF THE STEEL THIMBLE IN THE PLANE DEFINED BY THE AXIS OF THE THIMBLE AND LOAD. NOTE 2: THE LOAD SHALL BE APPLIED AT A POINT EQUAL IN HEIGHT TO THE LAYER ARM (PIN HEIGHT ABOVE ARM), AT A RATE OF APPROXIMATELY CM ( ) PER MINUTE, THROUGH A STEEL THIMBLE SCREWED TO THE LEAD HEAD.

6 TABLE-C MINIMUM CANTILEVER TEST LOAD AT 10 ITEM NUMBER MINIMUM LOAD(KGS) MINIMUM LOAD(LBS) TRB-10 455 1,000 TRB-940 455 1,000 TRB-1220 955 2,100 TRB-1230 955 2,100 TECHNO ELECTRICALS LIMITED, UNIT-3 156, Nasirabad Industrial Area.

7 Chittagong-4210 Pole Top Pin Material : Pins: Iron or STEEL as per ANSI Lead Thread: Lead Alloy Strength : Pins: Cantilever Test : according to figure-III, table-1 & ANSI Torsion Test: kg-m of torque with tightening rotation of 180 degree. Tensile Test: after applying kg-m of torque, it will withstand min. tensile load of 1, kg. Thread : Lead Thread made of Lead Alloy. Finish : Both lead thread and pin shall be hot-dip galvanized as per ASTM A153, shall bear the manufacturer symbol/identification mark Dimension : As per Table A , B & mentioned in the respective figure Tolerance : As specified in respective figure or table.

8 Test & Inspection : As per ANSI Packing : Each package contains 50 (Nos.) pole top pins. Origin BANGLADESH. FIGURE-I NOTE 1: CHANNEL LEGS MAY BE FLANGED OR OTHERWISE FORMED TO MEET STRENGTH REQUIREMENT. NOTE 2: THIS DIMENSION MAY BE VARIED TO PROVIDE REQUIRED STRENGTH. NOTE 3: THIS DIMENSION SHALL NOT BE LESS THAN CM (4 ) TECHNO ELECTRICALS LIMITED, UNIT-3 156, Nasirabad Industrial Area, Chittagong-4210 TABLE-A DIMENSION OF POLE TOP PIN IN INCHES DIMENSION OF POLE TOP PIN:CM(INCH) ITEM No A B C D E F G H I J K TRB-20 (20) (8) (1) (11/16) (11/16) (1-1/4) (1) SEE NOTE-3 (1-7/8) SEE NOTE-2 SEE NOTE-2 TRB-1280 (20) (8) (1-3/8) (11/16) (11/16) (1-1/4) (1) SEE NOTE-3 (1-7/8) SEE NOTE-2 SEE NOTE-2 ALLOWABLE TOLERANCE +CM -CM SEE FIG-2 0 0 N/A N/A N/A N/A N/A N/A N/A N/A +INCHES -INCHES 1/4 1/8 1/16 1/16 SEE FIG-2 1/32 0 1/32 0 1/16 1/16 N/A N/A N/A N/A 1/16 1/16 N/A N/A N/A N/A FIGURE-II NOTE 1.

9 THIS IS THE DIAMETER MEASURED BETWEEN THE TAPERED LINES PROJECTED ALONG THE OUTSIDE SURFACE OF THE THREADS AT TOP EXTREMITY OF THE LEAD HEAD. TAPER EQUALS (1/16 ) IN DIAMETER PER CM (INCH) IN LENGTH. NOTE 2: FOUR (4) THREADS PER CM (1 ). TABLE-B DIMENSION OF LEAD THREAD DIMENSION OF LEAD THREAD Item no LEAD HEAD A B C D E F G TRB-20 CM INCHES 1 5/64 13/16 5/8 3/64 TRB-1280 CM INCHES (1-3/8) 9/64 1-1/8 3/4 7/64 CM + + + ALLOWABE VARIATIONS INCHES + + + TECHNO ELECTRICALS LIMITED, UNIT-3 156, Nasirabad Industrial Area, Chittagong-4210 FIGURE-III NOTE - 1: APPLICATION OF LOAD MUST COINCIDE WITH CENTERLINE OF TESTING MACHINE.

10 NOTE -2: THE ANGLE OF DEFLECTION (ANGLE ) SHALL BE DETERMINED BY THE INTERSECTION OF THE CENTERLINE AXIS OF THE STEEL THIMBLE IN IT S INITIAL POSITION WITH THE CENTERLINE AXIS OF THIS THIMBLE OBTAINED AT ANY EDFLECTED POSITION OF THE PIN NOTE - 3: THIS END OF THE STEEL THIMBLE SHOULD NOT EXTEND BEYOND LEAD THREAD. TABLE-1 TEST SIZE OF PIN LEVER ARM MINIMUM REQUIRED LOAD BASED IN A MAXIMUM DEFLECTION OF 10 DEGREES T 50. 8 CM (20 ) CM (11 ) Kg (1,500 Lbs) L CM (20 ) CM (11 ) Kg (1,200 Lbs) TECHNO ELECTRICALS LIMITED, UNIT-3 156, Nasirabad Industrial Area, Chittagong-4210 MACHINE BOLTS Material: Machine Bolts & Square Nuts - STEEL as per ANSI Strength: Tensile strength of machine bolt as per table 10 of ANSI Bending strength as per section of ANSI Thread: Rolled Thread as per class 2 of ANSI & ANSI & Nut shall be tapped according to ANSI table 8 Finish: Hot-Dip galvanized as per ASTM A153, shall bear the manufacturer symbol/ identification mark Dimension :As per Table A and figure Tolerance.