Browse Prior Art Database

Self-Limiting Heat Tape Splice Box

IP.com Disclosure Number: IPCOM000104521D
Original Publication Date: 1993-Apr-01
Included in the Prior Art Database: 2005-Mar-19
Document File: 1 page(s) / 44K

Publishing Venue

IBM

Related People

Brodsky, WL: AUTHOR [+3]

Abstract

Disclosed is a method of splicing self-limiting heat tape. This method eliminates problems due to forces, stress/strain, and moisture infiltration as well as provides accessibility to the splice after installation.

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This is the abbreviated version, containing approximately 95% of the total text.

Self-Limiting Heat Tape Splice Box

      Disclosed is a method of splicing self-limiting heat tape.
This method eliminates problems due to forces, stress/strain, and
moisture infiltration as well as provides accessibility to the splice
after installation.

      As shown in the figure, the splice is enclosed in a water tight
junction box (1) which isolates the connection from the weather and
provides free access to the splice.  The tape's entrance and exit to
the box is sealed with a gland seal (8) matching the tape size to
eliminate moisture from entering the box.

      Looped jumper wires (2) of thermo plastic heat resistant
insulated (THHN) wire are placed between the tape section bus wires
and each tape section is clamped to the box with a lock nut (9),
eliminating stress/strain in the bus wire connections.  The lock nut
(9) prevents external forces from entering the splice region while
deformation of the THHN jumper wires minimize forces, stress and
strain in the splice region.

      The THHN jumper wire loops are connected to the bus wires (3)
of the tape, using standard metallic crimp barrel connectors further
strengthen the splice and improve reliability.  The barrel connectors
are encased in heat shrink tubing (6) for electrical insulation and
to prevent moisture intrusion.  The ground braid (7) of each section
of tape are connected using a standard wire nut (10).

      The box is secured to the pipe, which the heat tape is
protecting, us...