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GP Self-regulating cable for gutters and downpipes
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GP Self-regulating Cable for Gutters and Downpipes

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GP Self-regulating cable for gutters and downpipes

GP Self-regulating cable for gutters and downpipes

  • Stops the accumulation of ice in gutters and downpipes
  • Ensures that rain and melt-water can drain away normally and not cause damage to properties
  • Reduces risks from collapsing gutters and falling icicles

Range

 

Model

Description

GP-18 Self regulating cable

GP-18

Self-regulating cable  (supplied by the metre)

GC-P Gel filled connector

GC-P

Gel filled connector for power lead

GC-P Gel filled end seal

GC-E

Gel filled end seal

GP-S Spacer kit

GP-S

Spacer kit (5 stainless steel spacers and 10 cable ties)

GP-T Thermostat

GP-T

Thermostat with dual settings IP65

Technical Specification

GP-18 cable

Voltage: 230V
Nominal output at 0°C in ice water: 36W/m
Nominal output at 0°C in air: 18W/m
Minimum installation temperature: -40°C
Maximum exposure temperature (power on): 65°C
Maximum exposure temperature (power off): 85°C
Minimum bending radius: 25mm
Maximum circuit length: 65m

Construction

  • Tin coated copper bus wires
  • Self-regulating polymer with bonded jacket
  • Thermoplastic insulation
  • Tin coated copper earth braid
  • UV resistant thermoplastic overjacket

 

Breaker size for GP-18 cable

Breaker (Type C)

Cable Length (m)

10A

1 to 60

16A

60 to 65

Features & Benefits

Feature Benefit

Self-regulating cable meaning that output decreases as the surrounding temperature increases

Prevents energy waste and reduces running costs

Eliminates ‘hot spots’ and risk of failure caused by cables touching or crossing

Cable uses parallel construction

Electrical connections only need to be made at one end of the cable.  The far end is merely sealed.

Allows cable to be cut to length on site without affecting the watts per metre output

Gel filled connector and end seal

Installation can be carried out quickly and safely without the need for a heat gun

Spacer kits

Protect cables as they pass over a sharp edge and maintain the correct spacing where multiple runs are required

UV resistant overjacket

Ensures long life in exposed areas

Continuous earth braid Protects against electric shock if cable is damaged

 

How it works

GP-18 self-regulating cable is designed to be installed in gutters and downpipes to prevent the problems associated with the accumulation of ice. 

The heart of a self-regulating cable is a special polymer containing carbon particles.  Two bus wires run in parallel along the length of the cable with one connected to ‘live’ and the other to ‘neutral’.  The heating circuit is completed through the polymer along the entire length of the cable.  As the surrounding temperature reduces, the polymer contracts creating many electrical paths across the integrated carbon particles and increasing heat output.  When temperatures increase the polymer expands reducing the electrical paths with a corresponding reduction in heat output.

The combination of self-regulating technology and parallel construction has several advantages.

  • The cable can be reduced in length without affecting the watts per metre output
  • The cable can be allowed to touch and cross without creating ‘hot spots’

The output will reduce as the need for heating reduces with the corresponding reduction in running costs.

Controls

GP cable is self-regulating meaning that it its output will decrease as the surrounding temperature decreases.  However as it will never actually switch itself off, some form of remote switching mechanism is required to avoid wasting energy and incurring unnecessarily high running costs.

GP-T electronic thermostat - open

GP-T open

GP-T electronic thermostat - closed

GP-T closed

For small domestic installations, the system is often switched on and off using a simple manual switch however for larger installations; we recommend control by means of our GP-T electronic thermostat.

The problems associated with snow and ice occur when the ambient temperature is between +5°C and -5°C.  To ensure maximum economy, the GP-T has two set-points.  In this way the system will be switched off when it is either too warm or too cold for problems to arise.   The GP-T is rated IP65 and should be mounted in a sheltered location (typically under the eaves of a property).  The thermostat requires a 230V supply and will switch loads up to 3.6kW and is therefore capable of switching the maximum circuit length of GP cable (65m) directly.

Selection

If you would like the experts at BN Thermic to select a gutter protection system for you, please send an email to sales@bnthermic.co.uk  with details of your application and we will respond with detailed proposal.

 

Cable selection for gutters

A single run of GP-18 self-regulating heating cable will protect gutters with widths up to 120mm.  For wider gutters add an additional run for every 120mm increase in width.  For example a 350mm wide gutter will require 3 runs of cable.

 

 

 

 

Cable selection for downpipes

For downpipes at the end of a gutter a single run of GP18 self-regulating cable will be required.  The cable should extend approximately 500mm below ground level.

For downpipes which interrupt a gutter, a loop of cable should be installed with the end of the loop extending approximately 500mm below ground level.

 

 

Terminations

GC-P gel filled connector

GC-P

BN Thermic’s gel filled termination devices should be used.

Each run will require 1 x GC-P connector which is used to connect the heating cable to the power lead (typically a 2.5mm²  twin and earth cable)

 

GC-E gel filled end seal

GC-E

1 x GC-E gel filled end seal will also be required to seal the end of the cable.

 

 

 

Spacer Kits

A GP-S spacer kit consists of five stainless steel spacers and 10 UV resistant cable ties.  The spacers are used to protect the heating cable as it passes over a sharp edge and to maintain the correct spacing when multiple cable runs are installed in a gutter.

 

 

 

GP

Downloads

Instructions and specification sheets are available for BN Thermic’s entire range of products, including GP Self-regulating Cable for Gutters and Downpipes.

GP

Product Images

GP Self-regulating cable for gutters and downpipes

GP Self-regulating cable for gutters and downpipes

GP-18 cable supplied on a drum for easy handling

GP-18 cable supplied on a drum for easy handling

Installation Images

A close up of our GP self-regulating cable

A close up of our GP self-regulating cable

Our GP cable is suitable for commercial and domestic applications

Our GP cable is suitable for commercial and domestic applications

ENQUIRY FORM

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Industrial and Commercial Heating Enquiry Form

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Dimensions

m
m
m

Glazing

m2
m2
°C
°C

Underfloor Heating Enquiry Form

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Dimensions

Pipe freeze Protection Enquiry Form

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