Busbar Insulation and Covers

S1-B Busbar Lap Joint Insulation Cover 1 kV to 36 kV

Molded clip open covers that insulate bolted busbar joints and still allow inspection without damaging the connection

Operating temperature: -40 to 105°C
Voltage class: 1kV to 36kV
Environmental friendly, RoHS compliant
Standard Color: Red, Yellow, Green, Black
According to customer drawings or lap joints shape size,to be customized.

Request a Quote Talk to an Engineer Download Datasheet PDF

S1-B Busbar Lap Joint Insulation Cover 1 kV to 36 kV manufactured by UPM Heat Shrink

S1-B · Busbar Insulation and Covers

Product Overview

What S1-B Does

Suitable for 1~36kV voltage rate, power switchgear or power transmission and distribution system, various types of lap joints. Cover type insulation protection, to prevent flashover or discharge caused by small animals, dust, pollution, condensation and other accidents. Buckle type opening and closing design, convenient inspection and maintenance, without damaging the lap point. Crosslinked polyolefin material, excellent weather resistance, high temperature resistance, mechanical damage resistance.

Molded clip open covers that insulate bolted busbar joints and still allow inspection without damaging the connection 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

Cover type insulation on the one part of a busbar run a tube cannot reach
Buckle type opening and closing so inspection and maintenance do not damage the joint
Cross linked polyolefin with weather high temperature and mechanical damage resistance
Four colours so the joint matches the phase colour of the bar
Customised to your drawing or to the measured joint dimensions

Who It Is For

Who Benefits Most from S1-B

The buyers and site teams this product was designed around

Switchgear Manufacturers

Every insulated busbar run has bolted lap joints and a tube cannot cover them.

Substation Maintenance Teams

Bolted joints must be thermographically inspected and torque checked which means the cover has to open.

Industrial Plant Electrical Departments

Joints in motor control centres and distribution boards that need routine inspection.

Retrofit Contractors

Adding joint covers after an animal or condensation fault.

Problems It Solves

Problems This Product Removes

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

A Shrink Tube Cannot Conform to a Bolted Lap Joint

The stepped profile of a lap joint with bolt heads cannot be covered by a tube. A molded cover matched to the joint shape is the only clean solution.

Permanent Covers Block Inspection

Bolted joints require torque checks and thermographic survey. The buckle type opening lets the cover be removed and refitted without damage.

Small Animals Dust Pollution and Condensation Bridge Exposed Joints

The joint is normally the largest exposed metal area in an insulated busbar system.

Every Switchboard Has Different Joint Geometry

Covers are made to customer drawings or to the measured joint shape and size.

Application Scenarios

Where It Is Used

Switchgear Busbar Lap Joints

Bolted connections between main bar sections.

Dropper to Main Bar Connections

Tee and lap joints inside a cubicle.

Transformer Terminal Connections

Bolted bar terminations at a transformer.

Motor Control Centre Bar Joints

Joints in vertical and horizontal bar systems.

Retrofit After a Bridging Fault

Adding joint covers to an existing switchboard.

Technical Data

Specifications and Dimensions

Test methods and requirements taken directly from the manufacturing specification

S1-B construction and dimension diagram — S1-B 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.

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 S1-B Compares

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

Busbar Position	Solution
Straight bar run	S1 S1-10 S1-35 or halogen free equivalent tube
Bolted lap joint	S1-B molded cover
Live installed conductor	S1-A wrap around cover
Cable termination lug	Kit tubing from C1 C15 or C35

Use Guide

How to Select and Install S1-B

The sequence our engineers walk customers through on every first installation

01
Measure the Joint

Record the bar width thickness overlap length bolt count bolt head height and any spacer dimensions.
02
Send a Drawing or Photograph

A dimensioned sketch or a photograph with a rule across the joint is enough for us to quote.
03
Choose the Colour

Match the cover colour to the phase colour used on the bar.
04
Fit After the Joint Is Torqued

Install the cover only once the bolted connection has been torqued and inspected.
05
Close the Buckle Fully

The buckle must be fully engaged along the whole length so no gap remains.
06
Reopen for Inspection

At each maintenance interval open the buckle inspect the joint then refit the same cover.

FAQ

S1-B Frequently Asked Questions

The questions buyers ask before they place an order

Are covers made to order

Yes. Covers are customised according to customer drawings or the measured lap joint shape and size. Send a dimensioned sketch or a photograph with a scale and we will quote.

Can the cover be removed and refitted

Yes. That is the point of the buckle type opening and closing design. The joint can be inspected and the cover refitted without damaging either.

What voltage class does it cover

1 kV to 36 kV in power switchgear and transmission and distribution systems.

Does the cover allow thermographic inspection

The cover must be opened for a direct thermographic survey of the joint. That is why the buckle design was chosen over a permanent cover.

What material is used

Cross linked polyolefin with excellent weather resistance high temperature resistance and mechanical damage resistance.

What is the lead time for custom covers

Tooling and first article typically run 20 to 30 working days depending on complexity. Repeat orders from existing tooling are much faster. Ask us on WhatsApp for a project schedule.

Still need an answer ask our engineers on WhatsApp

S1-35