Contact Messenger Wire De-Icing
Condensed Specification: Contact Wire Heater System
This specification covers the general requirements for a constant wattage
heating cable specifically designed for the purpose of deicing overhead
contact wire for Mass Transit Systems and other similar applications.
For a complete specification that includes installation and testing
recommendations, contact RTR.
Part 1 - General
Furnish and install an ice melting system complete with heating cable,
mounting hardware, controls, installation and assembly instructions.
The heater shall be installed on grooved trolley wire using spring clips at
1 ft. intervals.
Part 2 - Products
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2.1: |
The heating
cable and termination components shall be per RTR Specification
#501017.
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2.2: |
The heating
cable shall consist of an insulated constant wattage heating conductor
surrounded by a silicon based heat transfer material, connected to
customer specified length of "cold lead" wire.
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2.3: |
Power output
shall be controlled by a micro processor based On/Off controller
provided by the heater cable manufacturer. A nominal 8 w/ft
output shall be constant along the entire heater length.
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2.4: |
If
mechanical damage occurs during installation, the heater cable shall
be repaired using repair kits provided by the manufacturer.
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2.5: |
The heating
cable shall operate on (select 600, 650 or 750Vdc) and shall be
available in standard 500 or 1000 lengths.
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2.6: |
Each heater
cable assembly shall be tested in accordance with RTR specification
#501017.
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Part 3 - Installation
|
3.1: |
The heating
cable shall be installed according to RTR's recommendations, the
Installation Instructions supplied with the heating cable and the
Operation and Maintenance Manual.
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3.2: |
A 2500Vdc
Megger test of the cable assembly shall be performed by the installer
prior to installation onto the contact wire.
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3.3: |
Pre-installation preparation of the grooved trolley wire shall be
performed per the manufacturer's installation instructions, RTR
#II601030.
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3.4: |
All heater
lengths shall be connected and referenced to the same (+) potential DC
power source, and ALL heater positive (+) terminations shall be landed
in the control box. |
|
3.5: |
ALL negative (-) common DC connections shall be
protected in conduit on support poles and at any foot traffic levels
and shall be connected to the reference using the authority approved
methodology. |
| Washington Tunnel
Portal |
Contact Wire Splice |
Section Insulator |
 |
 |
 |
| Washington Tunnel
Interior |
Cat Heat Installation
Crew |
Contact Wire /
Messenger Wire |
 |
 |
 |
Part 4 - Testing
The heating cable shall be tested for resistance value after installation
onto the trolley wire, and before connecting to the control box or
reference. Measured resistance must fall within the manufacturer's
specified range. Annual inspections and resistance measurements shall
be made/taken as detailed in the manufacturer's Operations and Maintenance
Manual.
Contact Messenger Wire De-Icing Reference List
|
Description |
Program |
| CAT Heat on Test |
Buffalo |
| CAT Heat |
Chicago |
| CAT HEAT on Test |
Cleveland |
| CAT Heat |
Pittsburgh |
