Molded Cable Parts

Y3 Non Tracking Heat Shrink Rain Sheds for Outdoor Terminations

Red anti tracking skirts with mastic collars that build creepage distance on outdoor terminations from 1 kV to 36 kV

Operating temperature: -55 to 105°C
Minimum fully recovery temperature: 150°C
Voltage class: 1kV ~ 36kV
Non-tracking, UV and weather resistance
Adhesive liner
Standard Color: Red

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Y3 Non Tracking Heat Shrink Rain Sheds for Outdoor Terminations manufactured by UPM Heat Shrink

Y3 · Molded Cable Parts

Product Overview

What Y3 Does

Cross-linked polyolefin, non-tracking, mastic applied to collars.Suitable for insulation of outdoor power cable termination.

Red anti tracking skirts with mastic collars that build creepage distance on outdoor terminations from 1 kV to 36 kV It is manufactured by Dalian United Polymer Material Co., Ltd. in Dalian China where radiation cross linking extrusion and molding are all performed in house under one quality system.

Key Benefits

Creepage distance added in defined increments so the design is calculable
Non tracking cross linked polyolefin that resists surface erosion under dry band arcing
Mastic collars that seal each shed to the termination so water cannot get behind it
UV and weather resistant so the shed profile survives years of exposure
Fitted new or retrofitted to a termination already in service

Who It Is For

Who Benefits Most from Y3

The buyers and site teams this product was designed around

Utilities in Coastal and Polluted Regions

Salt fog cement dust and industrial fallout shorten the effective creepage path on any outdoor termination.

Desert and High Altitude Network Operators

Sand deposition and low air density both raise the flashover risk on an outdoor termination.

Renewable Project Contractors

Solar sites in agricultural and coastal areas where the collector terminations sit in the open.

Substation Maintenance Teams

Retrofitting extra creepage onto existing terminations that flash over in dirty conditions.

Problems It Solves

Problems This Product Removes

Every one of these is a failure mode we have seen on real networks

Pollution Turns a Clean Surface into a Leakage Path

A film of salt or dust plus dew creates a conducting layer. Sheds break that path by creating a protected dry zone under each skirt.

The Straight Surface of a Termination Has Limited Creepage

Each shed adds surface length without adding termination height. That is the cheapest way to raise the creepage ratio.

Terminations Flash over During the First Rain After a Dry Spell

This is when the accumulated pollution dissolves. Sheds keep part of the surface dry throughout.

Retrofitting Sheds Onto an Existing Termination Is Usually Impossible

Y3 sheds slide over the finished termination and shrink into place with mastic collars sealing each one.

Application Scenarios

Where It Is Used

Outdoor MV Terminations

Standard fitment on any WSY outdoor termination in the C15 and C35 families.

Coastal Substations

Terminations within salt spray range of the sea.

Cement and Mining Sites

High dust deposition environments.

Pole Top Terminations

Overhead to underground transitions exposed to full weather.

Retrofit on Flashover Prone Terminations

Adding creepage to an existing installation that has a poor service record.

Technical Data

Specifications and Dimensions

Test methods and requirements taken directly from the manufacturing specification

Technical Data

Property	Test Method	Requirement
Tensile Strength	ASTM D2671	≥12 MPa
Ultimate Elongation	ASTM D2671	≥300%
Heat Aging (136°C/168h) Tensile Strength Ultimate Elongation	ASTM D2671	≥10 MPa ≥200%
Water absorption (23°C/24h)	ASTM D2671	≤0.5%
Low-temperature flexibility (-40°C/4h)	ASTM D2671	No cracking
Heat shock (200°C/4h)	ASTM D2671	No dripping or flowing
Dielectric strength	ASTM D2671	≥15 kV/mm
Volume resistivity	ASTM D2671	≥1.0×1013 Ω·cm
Tracking and erosion resistance	ASTM D2303	After 1hr at 2.5kV, and 1hr at 2.75kV, No burn penetration, no sustained burning
Note: Use standard samples for testing

Dimensions

Size Y3	As supplied(mm) Inner diameter D2 (±10%)	After recovered (mm) Inner diameter D2 (max.)	Diameter D1 (nom.)	H (min.)	Wall thickness W (nom.)
30/12	30	12	95	18	3
35/14	35	14	95	18	3
45/19	45	19	120	20	3
50/19	50	19	120	20	3
60/23	60	23	130	20	3
75/30	75	30	140	22	3
110/50	110	50	175	28	3
130/65	130	65	200	30	3
160/80	168	80	245	30	3
180/80	180	80	245	30	3

Y3 construction and dimension diagram — Y3 as supplied and fully recovered dimensions. D is the supplied inner diameter d is the recovered inner diameter and t is the recovered wall thickness.

CROSS REFERENCE · Tyco-Raychem: SSC/ESC

Manufacturing and Quality

How It Is Made and Checked

Compounding extrusion radiation cross linking expansion and test all under one roof in Dalian

01
Compounding

Base polyolefin antioxidants flame retardants and functional fillers are mixed to a recipe held under our own formulation control rather than bought as a masterbatch.
02
Extrusion

The compound is extruded to the required wall and diameter. Co extruded products form two or three layers in a single pass so no interface can trap air.
03
Radiation Cross Linking

Electron beam irradiation creates the cross linked network that gives the material its shape memory. This step is what makes the product heat shrinkable.
04
Expansion

The cross linked part is heated expanded to its supplied diameter and cooled under tension so the expanded shape is locked in until heat is applied again.
05
Test and Inspection

More than 90 percent of product performance tests are carried out in our own laboratory including tensile elongation heat aging dielectric strength and tracking resistance.
06
Packing and Traceability

Each batch carries a production record so a delivered part can be traced back to its compound lot and process parameters.

Extrusion and irradiation workshop at the UPM Heat Shrink factory in Dalian China — Extrusion and processing workshop in Dalian. Line side inspection stations let an operator check wall thickness and concentricity without stopping the run.

Certification

ISO 9001:2015

Quality management system

IATF 16949:2016

Automotive quality management

ISO 14001:2015

Environmental management

ISO 45001:2018

Occupational health and safety

GJB 9001C-2017

Defence quality management

UL 224 E341796

Extruded insulating tubing

CE / RoHS

European conformity and restricted substances

CCS / ABS / DNV

Marine classification society approvals

Comparison

How Y3 Compares

An honest comparison so you can rule this product in or out quickly

Pollution Level	Typical Shed Count per Phase	Environment
Light	2 to 3	Inland rural clean air
Medium	3 to 4	Suburban light industry
Heavy	4 to 6	Coastal cement works mining
Very heavy	6 or more	Salt spray zone heavy chemical

Use Guide

How to Select and Install Y3

The sequence our engineers walk customers through on every first installation

01
Assess the Site Pollution Level

The number of sheds is a function of pollution class not voltage alone. Tell us the site and we will recommend a count.
02
Fit the Termination First

Sheds are the last component fitted. Complete the insulation and screen work before starting.
03
Slide All Sheds on Before Heating

Position every shed at its final spacing before any heat is applied so nothing has to be forced past a shrunk shed.
04
Set Even Spacing

Space sheds evenly along the termination. Uneven spacing leaves a long unbroken creepage section which becomes the weak point.
05
Heat Each Collar from the Centre

Apply heat to the collar not the skirt so the mastic flows and seals against the termination.
06
Check the Seal

Mastic should be visible at the collar edge on every shed. No water should be able to get behind a skirt.

FAQ

Y3 Frequently Asked Questions

The questions buyers ask before they place an order

How many rain sheds do I need

It depends on the site pollution class and the required creepage ratio. Light pollution needs 2 to 3 per phase and very heavy salt spray sites need 6 or more. Send us the site location and voltage class and we will calculate it.

Can sheds be retrofitted to an existing termination

Yes provided the termination surface is sound and can be cleaned. That is one of the most common uses of Y3 because it fixes a flashover problem without rebuilding the termination.

Why are the sheds red

Red is the recognised colour for MV insulation and the non tracking compound is formulated in red as standard. Other colours are available on a production run.

Do sheds need to be sealed to the termination

Yes. The mastic collar is what stops water tracking behind the skirt. A shed fitted without the collar sealing is worse than no shed at all.

What recovery temperature is required

150 °C minimum. Heat the collar area rather than the skirt so the mastic reaches temperature and flows.

Are they suitable at 1 kV

They can be used from 1 kV to 36 kV although at 1 kV creepage is rarely the limiting factor. Sheds are most valuable from 6 kV upward.

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