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Components

 

High Voltage Insulator

Mittelspannungsisolator Mittelspannungsisolator
Product Code Creepage D L d A B C
MI 6075 (3.3 Kv) 112 mm 60 75 36 M6 X 16 M10 X 20 M12 X 24
MI 6090 (6.6 Kv) 140 mm 60 90 36 M6 X 16 M10 X 20 M12 X 24
MI 60130 (11 Kv) 197 mm 60 130 36 M6 X 16 M12 X 24 M16 X 34
MI 75130 (11 Kv) 197 mm 75 130 45 M10 X 20 M16 X 34 M20 X 36
MI 70210 (22 Kv) 285 mm 70 210 36 M6 X 16 M10 X 25 M16 X 55
MI 80300 (33 Kv) 440 mm 80 300 36 M6 X 16 M10 X 25 M16 X 75

Specification DMC/ SMC/ Epoxy Insolators
Properties Units Test Methods (ASTM )      
SMC DMC Epoxy
PHYSICAL
Specific Gravity   D-792 1.7 1.9 1.6 - 2.0
Glass Contents % N.A. 25 15  
Water Absorption (24 hrs) % D-570 0.2 0.15 .04 - 0.1
MECHANICAL
Tensile Strength Kgf/Cm2 D-638 700 400 750 - 400
Flexural Strength Kgf/Cm2 D-790 1550 900 800
Compressive Strength Kgf/Cm2 D-695 1800 1500 1600
Impact Strength Izod J/m D-265 600 250  
ELEKTRICAL
Dielectric Strength KV/mm D-149 12 10 13
Tracking Index Volts BS-5901 + 600 + 600 + 600
ARC Resistance Secs. D-495 + 180 + 180 + 180
Flammability   self Extinguishing      

TOLERANCE CHART
mm TOLERANCE ( ± )  
1-15 0.25 mm  
16-50 0.5 mm ( SMC = Sheet Moulding Compound )
51-100 1.0 mm ( DMC = Dough Moulding Compound )
101-250 1.5 mm  
250 & above 2 mm  

This information is applicable to following articles:
High Voltage Insulator MI, Polystyrol HEX knob IS and Polystyrol HEX knob ISS, ISK, ISD
Torque chart
recommended values - indicative only
Bolt size Grade 4,8
M Torque Nm
M4 1,5
M5 3,0
M6 5,1
M8 12
M10 25
M12 43
M14 68
M16 105
M18 145
M20 205
M22 275
M24 350

Recommended max. tightening torque in Nm for untreated oil-smeared screws.
Friction coefficient µ=0.125, torque corresponds to approx. 62% of tensile bolt stress.
Friction coefficient µ=0.14, torque corresponds to approx. 90% of tensile bolt stress.

Every bolted joint is unique and the optimum tightening torque should be determined for each application by careful examination. A properly tightened bolt is one that is stretched such that it acts like a very ridged spring pulling mating surfaces together. The rotation of a bolt (torque) at some point causes it to stretch (tension).

Several factors affect how much tension occurs when a given amount of tightening torque is applied.

  • The first factor is the bolt's diameter.
  • The second factor is the bolts grade. It takes more force to stretch an SAE grade 8 bolt (or a 12.9 quality bolt) than it does to stretch an SAE grade 5 bolt (or a 8.8 quality bolt) because of the greater material strength.
  • The third factor indicates that harder, smoother and/or slicker bolting surfaces, such as threads and bearing surfaces, require less rotational force (torque) to stretch (tension) a bolt than do softer, rougher and stickier surfaces.