SPLICING THEORY & PRODUCTS

• Supplied length is not long enough (reel end)

• Length is limited due to pulling distance and bends

• Cable failure

• Cable damaged after installation (e.g. dig-in)

• Tap into an existing cable (Tee or wye splice)

CAN SAVE $ $ $

“Why Splice a Shielded Power Cable?”

cause serious injury or death. Installation should be performed by personnel familiar with good safety practice in handling high voltage electrical equipment. De-energize and ground all electrical systems before installing product.

Caution: Working around energized high-voltage systems may

SPLICING THEORY & PRODUCTS

DEFINITION

A Splice can be defined as two or more conductors joined with a suitable connector, reinsulated, reshielded and rejacketed with compatible materialsapplied to a properly prepared surface.

Functions ofMEDIUM VOLTAGE SPLICES

• Insulate Between Voltage and Ground• Maintain Metallic Shield Continuity• Provide Protection from Impact and Moisture• Provide for a 30-40+ Year Service Life• Provide Resistance to Acidic & Alkaline Soil

• Control Electrical Stress in Connector Area

Common Steps forPOWER CABLE SPLICING

2. Join Conductors with a Connector

3. Reinsulate

4. Reshield

5. Rejacket

1. Properly Prepare Surface

Common Methods ofSPLICING

TAPE

COLD SHRINK

HEAT SHRINK

MOLDED PUSH-ON

Common Methods ofSHIELDING THE CONNECTOR AREA

SEMI-CON “GRADING”

EXAMPLETAPE

SPLICE

MOLDED SPLICE

CONDUCTIVE “ELECTRODE”

CAPACITIVE (HI-K) “GRADING”

(“Faraday Cage” Effect)

HEAT SHRINKSPLICEEXAMPLE

EXAMPLE

Common Methods & Materials forRE-INSULATING

EPR RUBBER

SPLICING TAPE

SILICONE RUBBERCOLD SHRINK

EPDMMOLDEDPUSH-ON

EVAHEAT SHRINK

Common Methods of Semi-ConRE-SHIELDING

INSULATION SHIELD

HEAT SHRINKSPLICE

TAPE SPLICEMOLDED RUBBER SPLICE

Semi-ConductingTape Integral Molded

Semi-Conducting Jacket

Semi-Conducting H.S. Tube

Common Methods of MetallicRE-SHIELDING

BraidedShielding Tape

Shielding Sleeve(or Shielding Sock)

Concentric Neutral Wires(from Original Cables)

Ground Strap Jumper

Common Methods ofRE-JACKETING

Resin

Armorcast™Mechanical Protection

Molded Semi-Conducting Rubber

Rubber & Vinyl Tapes

Cold Shrink

Heat Shrink

GROUNDING

• The shielded cable system must be grounded!

• There are many engineering & safety considerations for determining where & how many times to ground.

• A splice does not necessarily have to be a grounding location.

• Splice manufacturers generally provide a method for grounding (for use if the splice is to be grounded).

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Molded RubberPush-on Splice

TypicalMOLDED RUBBER SPLICE

SEMI-CONDUCTIVE ELECTRODE

(Replaces Cable Strand Shielding)

EPDMINSULATING RUBBER

(Replaces Cable Insulation)

SEMI-CONDUCTING JACKET

(Replaces Cable Insulation Shield & Jacket)

Examples ofPUSH-ON MOLDED SPLICES

Elastimold PCJ

Cooper EZ II

3M QS-II

3M™ QS- II APPLICATIONS

JACKETED CONCENTRIC NEUTRAL CABLES

Without Splice Jacketing

Cold Shrink Jacket Heat Shrink Jacket

Comparison toPUSH-ON “REPAIR SPLICE”

Standard 3M™ QS-II Splice Kit

(For repairing damaged cable with 1 elongated splice,eliminating the need for 2 standard splices)

3M QS-II Cable Repair Splice Kit

+ Less Installation Time than Tape Splice+ Production Tested Splice Body

- Installation Force to Push on Splice

- Parking Position on Prepared Cable (Non-symmetrical cutbacks)

- Limited Application Range

- Special Connector Required

- EPDM - Rigid in Cold Weather

- Must Know Cable Details

PUSH-ON EPDM RUBBER SPLICE

Heat Shrink Splice

TypicalHEAT SHRINK SPLICE

Stress ReliefMaterial

Sealant

Splice TubeInsulation

&Insulation Shield

Semi-con

Example ofHEAT SHRINK SPLICE

Raychem HVS

Step 1 Step 2

Step 3 Step 4

Heat Shrink Splice INSTALLATION

Park Tubes on Cable Connect

Stress Relief Material Stress Relief Material

Step 5 Step 6

Step 7 Step 8

Black Stress Control Tube Red Insulating Tube

Red Sealant Black/red Dual Layer Tube

Step 9 Step 10

Step 11 Completed Splice

Ground Braid Shielding Mesh

RejacketingTube

HEAT SHRINK SPLICE

+ Less Installation Effort and Time than Tape Splice

+ Wide Application Range (Easy Size Transitions)

+ Symmetrical Cutbacks

- Parking Position on Cable Jacket

- Torch Required (Permit required or Torch not allowed)

- Applying Heat Properly

- Must Know Cable Details

Note: This is not a 3M product

Cold Shrink Splice

TypicalCOLD SHRINK SPLICE

SEMI-CONDUCTIVE ELECTRODE

(Replaces Cable Strand Shielding)

SILICONEINSULATING RUBBER

(Replaces Cable Insulation)

SEMI-CONDUCTINGINSULATION SHIELD

(Replaces Cable Insulation Shield)

Example ofCold Shrink “EPDM RUBBER” Splice

Pirelli Elaspeed

Installed

Cold ShrinkSpiral Core

JacketPull Straps

Cut & RemoveStraps

Cold Shrink “EPDM RUBBER” Splice

+ Less Installation Effort

+ Wide Application Range (Easy Size Transitions)

+ Symmetrical Cutbacks

+ Constant Pressure on cables/connector

- Parking Position on Cable Jacket

- EPDM does not shrink well in Cold Weather

- Possibility for Core Hang-up

- Must Know Cable Details

Note: This is not a 3M product

Example ofCold Shrink “SILICONE RUBBER” Splice

3M™ QS-III Cold Shrink Cable Splice

Installed

(With Cold Shrink Jacketing)

Cold Shrink Silicone Rubber Splice INSTALLATION

Step 1 Step 1 Continued)

Step 2 Steps 3 & 4

Park Jacketing Tube(s) Park Splice Body

Connect Apply Red Compound

Step 5 Step 6

Step 7 Step 8

Install Splice Body Connect Neutrals(not shown)

(Shield Sleeve for shielded cable

Shown)

Rubber Mastic PositionJacketing Tube

Step 9 Completed Splice

InstallJacketing Tube

+ Less Installation Effort+ Wide Application Range (Easy Size Transitions)

Cold Shrink “SILICONE RUBBER” Splice

+ Symmetrical Cutbacks

+ Constant Pressure on cables/connector

+ Silicone Material shrinks well in all weather and is flexible

+ Production Tested Splice Body

- Parking Position on Cable Jacket

- Possibility for Core Hang-up

- Must Know Cable Details

Note: This is a 3M product

Cold Shrink 3M™ QS-III Cold Shrink Cable Splice

Cold Shrink Splice Body

Cold Shrink Jacket

INTRODUCING

3M™ QS-III Cold Shrink Cable Splice“FEATURES”

• COLD SHRINK DESIGN - Constant pressure on cables/connector– Good seal between cable and splice

– Higher impulse Voltage levels– Lower interface electrical stress

• SILICONE RUBBER MATERIAL– Good cold weather application– High temperature rating (class H)– Flexible splice body - moves with cable

• SPECIAL ELECTRODE DESIGN - Minimizes electrical stress– Undercut electrode end – Patented electrode places higher stresses within splice insulation, not along cable interface

3M™ QS-III Cold Shrink Cable Splice“ADVANTAGES”

• No special tools (easier installation)

• Minimized workmanship (faster installation)

• Factory tested (reliability)

• Quick installation (lower installed cost)

• Safe (no gas, open flame, etc.)

3M™ QS-III Cold Shrink Cable SpliceSUMMARY

THIS NEW GENERATION OF POLYMERIC SPLICES TAKES ADVANTAGE OF:

• New Developments in Silicone Rubber Technology

• Integrated 1-piece Design

• Factory Made - Factory Tested, Reliability

• Cold Shrink Design for Easier Field Installation

SPLICING SUMMARY• A “splice” may be considered as the reconstruction of a short section of cable - For proper splice selection, “match the cable”!

• Good cable preparation is critical for a reliable splice installation !

• For most installations where the cable details are known, modern molded and shrink type splices may be used for reliability, simplicity and fast installation.

SPLICE WORKSHOP

Examine and DiscussSplice Samples