The Heatfast HF1240 is a self-regulating trace heating cable that can be used for frost protection of exposed pipework and temperature maintenance applications. The cable's self-regulating ability comes from its conductive core, which decreases conductivity as temperature increases, adjusting heat output based on conditions along the pipe. Key specifications include a watt density of 40W/m at 10°C, maximum circuit lengths ranging from 33-89m depending on circuit breaker size and temperature, and operating temperatures from -45°C to 65°C.

1. HEATFAST HF1240
SELF-REGULATING TRACE HEATING CABLE
Product Overview
T&D’s Heatfast HF1240 is a self-regulating trace heating cable ideal for frost protection to pipework
exposed to low ambient temperatures. It can also be used for temperature maintenance
applications.
Parallel bus wires apply voltage along the entire length of the heater cable. The conductive core
provides an infinite number of parallel conductive paths allowing the cable to be cut to length on
site.
The self-regulating ability of the Heatfast HF1240 cable is derived from the properties of the
conductive core material. As the core temperature increases the number of conductive paths in the
core decreases – decreasing the heat output.
This occurs at every point along the length of the cable, adjusting power output to the varying
conditions along the pipe and ensures that the cable is only producing heat if it is required.
Part Ref HF1240
Cable Watt Density 40w/m at 10ºC
www.heattracing.co.uk
Technical Specification
Construction
Max Circuit Length Vs Circuit Breaker Size
Start-Up Temperature 16A 20A 25A
10ºC 57m 71m 89m
0ºC 50m 62m 78m
-10ºC 44m 55m 69m
-20ºC 40m 50m 62m
-40ºC 33m 42m 52m
CU Nickel-Plated Bus Wires
Self-Regulating Conductive Core
Thermoplastic Elastomer Dielectric Jacket
Copper Braid
Thermoplastic Elastomer Overjacket
Bus Wire Size 1.23mm²
Supply Voltage 230V
Maximum Circuit Length 89m
Maximum Maintenance Temperature 65ºC
Maximum Intermittent Exposure Temperature 80ºC
Maximum Continuous Exposure Temperature 65ºC
Minimum Bend Radius 25mm
Minimum Installation Temperature -45ºC

2. HEATFAST HF1240
SELF-REGULATING TRACE HEATING CABLE
www.heattracing.co.uk
Accessories
• Connection Kit for Power Connection, Tee Splice, Splices & End Seals
• Thermostatic Controls
• Junction Boxes, Tapes & Warning Signs
Contact Information
T&D (Gateshead) T&D (Bristol)
Gear House Units 9 & 10
Saltmeadows Road Birchills Trading Estate
Gateshead Emery Road
NE8 3AH Brislington
Bristol
BS4 5PF
Phone: 0191 490 1547 Phone: 0117 977 4647
Northernsales@thorneandderrick.co.uk Southernsales@thorneandderrick.co.uk