Spool Type Insulator EX-1
Largest spool in the range: 90 mm diameter, 15 kN transverse strength, 22 kV dry flashover.
The strongest spool in this range at 15 kN transverse strength, so the rack position that takes the dead-end pull can be built with a part that is genuinely sized for it instead of the same unit used everywhere else.
Dimensions
| Diameter (D) | 90 mm |
| Height (H) | 85 mm |
| Net weight | 0.5 kg |
Mechanical values
| Transverse strength | 15 kN |
Electrical values
| Low-frequency dry flashover voltage | 22 kV |
| Low-frequency wet flashover voltage | 9 kV |
Who this is for
Specified by
- Distribution utilities building low voltage secondary racks
- Rural electrification programmes running service drops to villages and farms
- Contractors terminating LV dead ends on poles and building walls
- Stores issuing secondary hardware to maintenance crews
The problem it is built around
Secondary racks are specified last and fail first. A spool chosen by diameter rather than by transverse strength ends up under a dead-end pull it was never sized for, and the repair is a truck roll for a part that costs less than the fuel.
What you get instead
The strongest spool in this range at 15 kN transverse strength, so the rack position that takes the dead-end pull can be built with a part that is genuinely sized for it instead of the same unit used everywhere else.
Why ours
Published transverse strength and both dry and wet flashover voltages for every size in the range, so the selection across a rack can be made on numbers rather than on what is in the crate.
Use guide
Before it goes on the line
- Select by transverse strength against the actual dead-end or angle pull, not by physical size.
- Use the EX-1 at the loaded positions on a rack and a lighter unit where the pull is small.
- Check the groove for chips before binding the conductor.
- Keep spools of one type together in stores. Mixed crates are how the wrong strength ends up at the wrong position.
Comparison
How it differs from the alternative
The EX-2 is the same spool family at 75 mm diameter and 12 kN transverse strength. Step up to the EX-1 where the pull is higher or the dry flashover requirement moves from 18 kV to 22 kV.
Related products
Often specified alongside
Compact spool: 75 mm diameter, 12 kN transverse strength, 18 kV dry flashover.
View specifications
Larger shackle: 100 mm diameter, 12 kN transverse strength, 22 kV dry flashover.
View specifications
10 kV porcelain pin insulator, 145 mm diameter, 195 mm creepage, 11 kN porcelain bending strength.
View specificationsAnswers
Spool Type Insulator EX-1: buyer questions
What transverse strength does the EX-1 have?
15 kN, the highest in this spool and shackle range.
What are the flashover voltages?
22 kV low-frequency dry flashover and 9 kV low-frequency wet flashover.
How heavy is it?
0.5 kg net weight, at 90 mm diameter and 85 mm height.
Can spool and shackle types be ordered on one pallet?
Yes. Mixed orders are normal on rural electrification projects and we pack and label by type so stores can issue them without re-sorting.
Quote the Spool Type Insulator EX-1
Tell us the quantity, the destination port and the delivery window, and we will come back with a delivered price and a production slot.