Insulators Offsets & Caps

Electric Fence Insulators, Offsets & Caps — Buying Guide

Insulators are one of the most important but often overlooked components of an electric fencing system. Without proper insulators, the fence wire makes electrical contact with the post, earthing the current and dramatically reducing the voltage reaching the rest of the fence. Quality insulators, properly installed, ensure maximum voltage retention along the entire fence run.

Types of Electric Fence Insulators

• Star picket / Y-post insulators: Clip or snap onto the flanges of a star picket, holding the wire at the correct distance from the metal post. Available in various styles including clip-on, pin-lock, and wrap-around designs
• Timber post insulators: Screw-in or nail-on insulators for use on timber fence posts and strainer posts — available in corner, line, and end configurations
• Pipe post insulators: Designed to attach to round steel pipe posts used in chain wire and structural fencing applications
• Tape insulators: Wide-channel insulators specifically designed to carry poly tape and wide conductor products without constricting or damaging the tape
• Corner and end insulators: Designed to handle the angled load at corners and end assemblies where the wire changes direction

Offset Brackets for Electric Fencing

Offset brackets (also called stand-off brackets or outrigger brackets) mount an insulator on an arm extending 100–300mm away from the face of the main fence. They are used to carry an electric wire in front of or above a physical fence — a critical technique for improving the effectiveness of wild dog, fox, and feral pig exclusion fencing. An electric offset wire at the correct height discourages animals from approaching the main fence to test or dig under it.

• Pig offset brackets: Position wires at 200mm and 400mm height above the ground on the outside of the fence — highly effective against feral pigs
• Wild dog offset brackets: Position wire at 200mm height on the outside to prevent dogs approaching and digging under the fence base
• Cattle and horse offsets: Position wire at appropriate height on the inside of the fence to prevent animals leaning on or pushing through the fence

Installation Tips

Inspect insulators regularly — UV degradation and physical damage from vegetation or animals can crack or break insulators over time, creating earth faults that reduce fence voltage. Replace any cracked, broken, or missing insulators promptly. Space insulators at every post as a minimum — on long spans between posts, add additional droppers or pigtail posts to maintain wire height and prevent the wire from sagging into vegetation or being pushed down by animals.

Frequently Asked Questions

How many insulators do I need per star picket?
Install one insulator per wire per star picket — if you have 3 wires on your fence, install 3 insulators per post. On long spans, additional droppers with insulators may be needed between posts to maintain wire height.

Why is my electric fence losing voltage?
The most common causes of voltage loss are: earth faults from broken or missing insulators (wire touching posts or vegetation), poor earth system performance, undersized energiser for fence length, or heavy vegetation contact. Check for broken insulators and vegetation growth touching the wire as first steps.

Order Electric Fence Insulators & Offsets Online — Australia-Wide Delivery

Discount Landscape Supplies stocks a comprehensive range of electric fence insulators and offset brackets for star pickets, timber posts, and pipe posts. Order online with fast dispatch to Brisbane, the Sunshine Coast, and all of Australia. Contact our team for advice on insulator selection for your fence type.