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PII20A Series

Standoff Insulator

  • for indoor service
  • 20A strength class
  • up to 46kV/250kV BIL
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Voltage (kV)
BIL (kV)
Height (Inches)
Outside Diameter
Insert Top
Insert Bottom
Drawing Purchase
105-205-01 5 60 3.50 4.00 A1 A1 Request Quote
105-205-09 5 60 3.50 4.00 A7 A7 Request Quote
105-208-01 8 75 4.50 4.00 A1 A1 Request Quote
105-208-09 8 75 4.50 4.00 A7 A7 Request Quote
105-212-01 12 95 5.10 4.00 A1 A1 Request Quote
105-212-09 12 95 5.10 4.00 A7 A7 Request Quote
105-215-01 15 95 6.00 4.00 A1 A1 Request Quote
105-215-09 15 95 6.00 4.00 A7 A7 Request Quote
105-218-01 18 110 7.50 4.00 A1 A1 Request Quote
105-218-09 18 110 7.50 4.00 A7 A7 Request Quote
105-225-01 25 125 8.75 4.00 A1 A1 Request Quote
105-225-09 25 125 8.75 4.00 A7 A7 Request Quote
105-228-01 28 150 10.50 4.00 A1 A1 Request Quote
105-228-09 28 150 10.50 4.00 A7 A7 Request Quote
105-231-01 31 150 11.00 4.00 A1 A1 Request Quote
105-231-09 31 150 11.00 4.00 A7 A7 Request Quote
105-235-01 35 170 12.75 4.00 A1 A1 Request Quote
105-235-09 35 170 12.75 4.00 A7 A7 Request Quote
105-238-01 38 200 14.50 4.00 A1 A1 Request Quote
105-238-09 38 200 14.50 4.00 A7 A7 Request Quote
105-246-01 46 250 20.25 4.00 A1 A1 Request Quote
105-246-09 46 250 20.25 4.00 A7 A7 Request Quote

General Description
- Voltage ratings from 5kV to 46kV
- Impulse rating up to 250 BIL
- High strength
- Partial discharge free
- Flammability rating, UL 94 V0, V1
- Various mounting insert configurations available, see options tab for alternatives
- Manufactured to specific industry standards (ANSI C29.1 and ANSI C29.10)


Applications
The PII20A series insulators are designed for indoor service, for ambient temperatures
between -25°C to +75°C. Applications include:
- supports for switchgear bus
- disconnects
- dry type transformers
- other special power applications.


Construction
- Cast in high dielectric strength Bis-A Epoxy
- Zinc plated steel mounting inserts are standard, other materials available upon request.
- Insulators rated 95kV BIL and higher have inserts connected to prevent partial discharge on
unused inserts

Standard Mounting Insert Configurations

Polycast offers several standard mounting configurations. For unique applications, custom configurations are also available.
Voltage Electrical Withstand Dimensions* (in inches) Mechanical** Withstand
  BIL 60Hz Height Creep Cantilever (lb) Torsion (in-lb)
5 60 19 3.5 6.0 1750 5000
8 75 26 4.5 7.5 1500 5000
15 95 36 6.0 10.5 1250 4000
18 110 50 7.5 14.5 1000 4000
25 125 60 8.75 17.0 800 4000
28 150 80 10.5 21.0 650 3000
31 150 80 11.0 21.5 600 3000
35 170 80 12.75 27.0 500 2000
38 200 95 14.5 28.75 On application*  
46 250 105 20.25 30.75 On application*  

* A11 PII20A insulators are 4.0" diameter, except CAT.NO.s PII20A38 and PII20A46 which have a 4.25" diameter flared base for additional mechanical strength.

** Mechanical Withstand values are 80-90% of ultimate values and are specified for four and five inserts configurations. Values for one, two, and three inserts configurations are lower. Working loads up to 50% of published values are considered safe for all insert options, but maximum loading will vary with the application and conditions of use. Cantilever forces were applied 2.50” above the loaded end of the insulator.

Additional Mechanical Withstand Details:
Tension - 5,000 lb      Compression - 30, 000 lb