Spool Insulators ANSI 53-3
ANSI 53-3 Spool Insulator With 18.2 kN Transverse Strength
ANSI 53-3 is the larger porcelain spool insulator: 76 mm diameter, 81 mm high, with a 4,000 pound (18.2 kN) transverse strength and a net weight of 0.55 kg. It fits a secondary rack or clevis to carry low voltage service and secondary conductors, and its groove profile holds the conductor without a separate tie at the dead-end.
Key Benefits
- 18.2 kN transverse strength for secondary dead-end loads
- 25 kV low-frequency dry flashover voltage
- Rated wet flashover in both vertical and horizontal mounting
- 0.55 kg per unit for high-volume secondary work
Technical Features
- 76 mm diameter, 81 mm height
- 12 kV wet flashover vertical and 15 kV horizontal
- Grey or brown glaze
- Grooved body that seats the conductor without a separate tie
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) | 3Inches (76mm) |
| Spacing (H) | 3 3/16Inches (81mm) |
| Net Weight Each | 1.2Pounds (0.55kg) |
| Transverse Strength | 4,000Pounds (18.2kN) |
|---|
| Low-frequency Dry Flashover Voltage | 25kV |
|---|---|
| Low-frequency Wet Flashover Voltage, Vertical | 12kV |
| Low-frequency Wet Flashover Voltage, Horizontal | 15kV |
Application Scenarios
- Low voltage secondary racks on distribution poles
- Service drop dead-ends to buildings
- Street lighting and secondary conductor supports
Who It Is For
- Distribution utilities running secondary networks
- Service connection crews
- Wholesalers supplying secondary rack hardware
Problems It Solves
- Secondary conductors pulling out of undersized spools at dead-ends
- Spools that flash over when mounted horizontally
- Mixed spool sizes complicating rack assembly
How This Design Differs From the Alternatives
Compared With ANSI 53-2 spool
Higher transverse strength at 18.2 kN against 13.6 kN in a slightly taller body, for heavier secondary dead-ends.
Compared With ANSI 55-5 pin type
A secondary rack component rather than a primary conductor support; the pin type is used at 15 kV line potential.
Specifying and Installing This Unit
- Check the secondary dead-end tension against the 18.2 kN transverse rating
- Note that wet flashover differs by orientation, 12 kV vertical and 15 kV horizontal
- Seat the conductor fully in the groove before tensioning
- Match spool size to the rack or clevis dimensions already in use
Questions About This Product
Why are there two wet flashover figures?
A spool behaves differently depending on how it is mounted. The figures are 12 kV wet vertical and 15 kV wet horizontal, so the design reference follows your rack orientation.
Which spool size do we need?
53-3 for heavier secondary dead-ends at 18.2 kN, 53-2 for lighter work at 13.6 kN. Most utilities stock one and use it throughout.
Does the spool need a tie wire?
The groove seats the conductor at a dead-end. Where a spool is used as a support rather than a termination, follow your standard tying practice.
What is the shipping weight?
Approximately 0.55 kg per unit. Carton and pallet quantities are confirmed at order stage against your volume.
Are these made to ANSI dimensions?
Yes, to the ANSI 53-3 dimensional reference. Send your specification and we will confirm each dimension before you order.
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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.