Spool Insulators ANSI 53-2
ANSI 53-2 Spool Insulator for Secondary Racks
ANSI 53-2 is the standard porcelain spool insulator: 79 mm diameter, 76 mm high, with a 3,000 pound (13.6 kN) transverse strength and a net weight of 0.5 kg. It is the highest-volume component in the range, fitted to secondary racks and clevises across distribution networks to carry low voltage conductors and service drops.
Key Benefits
- 13.6 kN transverse strength for standard secondary loads
- 0.5 kg per unit, the lightest item in the range
- 25 kV low-frequency dry flashover voltage
- Rated wet flashover for both vertical and horizontal racks
Technical Features
- 79 mm diameter, 76 mm height
- 12 kV wet flashover vertical and 15 kV horizontal
- Wet-process porcelain, grey or brown glaze
- 3,000 pound (13.6 kN) transverse strength
Published Figures for This Design
The values below are the catalogued figures for this type. Where a figure your specification needs is not listed, ask and we will confirm it in writing rather than estimate it.
| Available Colors | Grey, Brown |
|---|---|
| Diameter (D) | 3 1/8Inches (79mm) |
| Spacing (H) | 3Inches (76mm) |
| Net Weight Each | 1.1Pounds (0.5kg) |
| Transverse Strength | 3,000Pounds (13.6kN) |
|---|
| Low-frequency Dry Flashover Voltage | 25kV |
|---|---|
| Low-frequency Wet Flashover Voltage, Vertical | 12kV |
| Low-frequency Wet Flashover Voltage, Horizontal | 15kV |
Application Scenarios
- Secondary rack construction on distribution poles
- Service drops to homes and small commercial buildings
- Low voltage network extensions and repairs
Who It Is For
- Distribution utilities and rural networks
- Service connection and maintenance crews
- Distributors supplying secondary line hardware
Problems It Solves
- Stock shortages of a fast-moving standard component
- Spools of inconsistent dimensions between batches
- Secondary conductors cutting into undersized grooves
How This Design Differs From the Alternatives
Compared With ANSI 53-3 spool
Lower transverse strength at 13.6 kN against 18.2 kN, for standard secondary racks rather than heavy dead-ends.
Compared With ANSI 54-2 strain insulator
A conductor support fitted to a rack, where the strain insulator is fitted in tension inside a guy wire.
Specifying and Installing This Unit
- Confirm the rack or clevis dimensions before ordering replacement spools
- Check secondary tension against the 13.6 kN transverse rating
- Use the orientation-specific wet flashover figure in the design check
- Reject chipped units; a chip at the groove will cut into the conductor insulation
Questions About This Product
What is the difference between 53-2 and 53-3?
53-2 is 79 mm diameter with 13.6 kN transverse strength; 53-3 is 76 mm diameter and taller with 18.2 kN. The electrical figures are the same, so the choice is mechanical.
Can we order a full container load?
Yes. Send the quantity mix across sizes and the destination port and we will quote the container loading and delivery schedule.
Are these suitable for coastal areas?
The porcelain and glaze are unaffected by salt. What matters is keeping the specified flashover margin for your secondary voltage, which these figures support.
How are the spools marked?
Type designation and production identification are marked on the body for traceability back to the production lot.
What happens to units removed from service?
Porcelain from withdrawn insulators can be ground for use as filler in refractory material or mortar. Metal hardware should be separated first and recycled as scrap.
Other Designs Buyers Compare With This One
Spool Insulators ANSI 53-3
ANSI 53-3 Spool Insulator With 18.2 kN Transverse Strength
View specifications
Double umbrella disk Suspension Insulators UG120B146/450D 16R
120 kN Double Umbrella Disc for Heavy Contamination
View specifications
Double umbrella disk Suspension Insulators UG70B146/450D 16R
70 kN Double Umbrella Disc for Dust and Dew Conditions
View specificationsRelated Industries
Request A Quote for Spool Insulators ANSI 53-2
Send the quantity, the destination port and the standard you buy against. Routine test records ship with the goods and type test reports are available on request.