scope:

This specification covers Terminal Junction System (TJS) components which are used for interconnection of wiring and incorporation of passive components (see 6.1). These environment resistant components have in common the use of crimp type external pin contacts in accordance with MIL-C-39029/1 for Series I or crimp type external socket contacts in accordance with MIL-C-39029/22 for Series II. This family of TJS components is designed to operate continuously over a temperature range of −65°C to 200°C, using any combination of temperatures generated by the electrical load and ambient temperature so that the maximum internal hot spot, combined temperature, will not exceed the maximum specified for the class of TJS component, unless otherwise specified (1.2, 3.1). The components making up the system and covered by this specification include:

a. Terminal junction bussing blocks (6.8.2)

(1) Feedback type (6.8.2.1)

(2) Feedthrough type (6.8.2.2)

b. Racks (mounting holders) for blocks (6.8.3)

c. Brackets, block mounting (6.8.4)

d. Wire in-line junctions (6.8.5)

e. Grounding terminal (6.8.6)

f. Grounding blocks (6.8.7)

g. Electronic blocks (6.8.8)

h. Electronic in-line junctions (6.8.9) Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Systems Engineering and Standardization Department (Code 53), Naval Air Engineering Center, Lakehurst, NJ 08733, by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter.

The TJS components conform to the requirements of MIL-STD-1277 and MIL-STD-454.

Terminal junction components fabricated to this specification are classified as follows:

a. Series. The Series I and II TJS components are not interchangeable or intermateable.

Series I. External pin contact crimped on wire. Series II. External socket contact crimped on wire.

b. Classes. Terminal junction components described herein are Class D. Classes A, B and C components are inactive for new design. Class D components shall be used for direct Government acquisition. Appendix A provides performance tests and other information relating to Classes A, B and C. Appendix A indicates the relationship between Class D part numbers and the superseded part numbers of Classes A, B and C. Series II components of MIL-T-81714 meet Class D environmental requirements.

The components covered by this specification shall be identified by a military part number, as shown by the applicable military specification sheet. Series I components shall be identified as in the following examples, or as otherwise specified (3.1).

A different component designator is required for each component having identical external contacts and for each combination of different contacts used in a block.

The bussing and circuit designators shall be as shown on the applicable specification sheet (3.1).

The maximum working voltages shall be as shown in Table XIII.

Each external contact with the indicated dash number accommodates the range of conductor sizes specified in Table I.

For TJS components, each grommet aperture for a specified contact dash number seals on the O.D. range of smooth finished wires specified in Table I.

CAUTION: WHEN SELECTING WIRE REQUIRING SEALING, THE FINISHED DIAMETER SHALL BE WITHIN THE O.D. RANGE SHOWN IN TABLE I.

This appendix details the requirements and tests only for classes A, B and C components. The relationship of classes for bussing blocks, electronic blocks, wire in-line junctions and electronic in-line junctions are shown in paragraph 60.1. Classes A, B and C components are inactive for new design. Class D components shall be used for direct Government acquisition. This appendix is a mandatory part of specification MIL-T-81714 Terminal Junction System. The information contained herein is intended for compliance.

Terminal junction components shall be classified as follows:

a. Class A 150°C (302°F) max environmental type, limited fluid resistance.

Class B 175°C (347°F) max environmental type, extended fluid resistance.

Class C 200°C (392°F) max environmental type, limited fluid resistance.

b. Class Housing color Grommet color A Green Green B Red White C Black Red

The components covered by this specification shall be identified by a military part number, as shown by the applicable military specification sheet. The components shall be identified as in the following examples, or as otherwise specified (30.1).

intended Use: