1、FORD MANUFACTURING STANDARDS ET1 MARCH 1995 TERMINAL BLOCKS ET1 Page 1 1. SCOPE: 1.1 I I I 1.2 1 I I I I I f I 1.3 1 f I I 1.3.1 .I I I I I 2. 2.1 This standard describes acceptable modular type terminal blocks, rated 600 Vat which are mounted on a track, strip, channel, or DIN type 3 (35mm symmetri
2、cal) Rail for use on control panels and sub-assemblies, and in terminal boxes on industrial equipment. Approved sources shall have a range of terminal blocks available for terminating stranded copper conductors, sizes AWG (American Wire Gauge) No. 18, 65 strands, through No. 4, 19 strands; and types
3、 for mounting for one or more of the following standard size fuses: 13/32 inch (1Omm) x l-1/2 inch (38mm), l/4 inch x 1 inch, l/4 inch x l-1/4 inch, 5mm x 2Omm, 25mm, and 30mm. Fusible terminals shall be available with neon and LED blown fuse-indicators. Circuit breaker type terminal blocks shall al
4、so be available. NOTE: Use of terminal blocks for wire sizes No. 4, AWG and larger requires written permission of the controls engineer at the requisitioning activity. DEFINITIONS: For purposes of this standard, a terminal block is defined as a pressure wire connector that establishes the connection
5、 between two or more conductors, or between one or more conductors and a termination point. Conductors shall be retained by screw-type terminals with a captive saddle clamp or by a screw-less cage clamp. A module is an assembly of terminals in a common insulating material base suitable for mounting
6、on a track or DIN type 3 Rail - with other singles blocks or modules of various ratings - and suitable for removal from a track without interference with adjacent units. REFERENCE STANDARDS: I Terminal blocks shall conform to the following Standards. In case I of any conflict, the requirements speci
7、fied in this standard, ETl, I shall prevail. a) Underwriters Laboratories (UL) Standard 4863, “Equipment Wiring. Terminals for use with Copper and/or Aluminum Conductors.“ b) Underwriters Laboratories (UL) Standard 1059, “Terminal Blocks.“ I c) Underwriter Laboratories (UL) Standard 508, “Industrial
8、 Control 1 Equipment.“ FORD MANUFACTURING STANDARDS ET1 MARCH 1995 TERMINAL BLOCKS ET1 Page 2 3. 3.1 3.2 3.3 3.4 3.5 3.6 I d) ASTM (American Society for Testing and Materials) Standard D495, I “Test Method for High-Voltage, Low-Current, Dry Arc Resistance of I Solid Electrical Insulation.“ I e) Comp
9、ly with NEMA Standard ICS 4, “Terminal Blocks for Industrial 1 Use.“ I All sources shall meet all these required Standards, and continued i approval is contingent upon manufacturers maintaining and conformance and certifications to these Standards as they evolve. GENERAL: Terminal connectors shall b
10、e suitable for terminating stranded copper conductors described in 1.2 without the use of a separate terminal or lug. Neither the head nor the point of the screw shall bear directly on the conductor strands. The conductor shall be secured between two non-rotating surfaces. I I I I I I I I I I The me
11、tallic clamping mechanism of the terminal block shall surround the wire from all sides to prevent strands from splaying outside the clamping area. For screw-type terminals this shall include serration on the captive pressure plate to ensure a gas tight connection and centering beads with wire stops.
12、 Screw-type and screwless cage-clamp terminals shall include funnel design wire entry that ensures uniform location on the conductor(s). Metal parts shall be non-corrosive or otherwise tinned or treated to resist the effects of corrosion and oxidation. Current carrying parts shall be of copper or co
13、pper alloy. The terminal block should be of sufficient size and design to accommodate a standard straight sided screwdriver with a minimum blade width of l/8 inch. A hex key wrench is acceptable for use on connectors AWG No. 4 and larger. If a headless screw is used, the tool recess shall remain abo
14、ve the threaded surface or opening when clamping the smallest conductors specified for the terminal block. Terminal block insulation shall withstand temperatures of at least 104 degrees C (220 degrees F), and shall have a flammability rating of UL 94-VI. 4. TERMINAL BLOCK ASSEMBLY: FORD MANUFACTURIN
15、G STANDARDS ET1 MARCH 1995 TERMINAL BLOCKS ET1 Page 3 4.1 Terminal block design shall be such that various sizes and special types (blocks which contain fuses or circuit breakers) may be arranged in any desired combination along the mounting rail holding the blocks. 4.2 The metal track, strip, or ot
16、her mounting means shall be provided with holes on 36mm (1.41 inch) centers or less for mounting the entire assembly to the metal panel with round head machine screws not smaller than No. 8. 4.3 If end barriers are required they shall be sufficiently rigid to prevent distortion and twisting of termi
17、nals when applying tightening torque to the terminal screws as specified in UL Standard 4863. This requirement shall be confirmed during set up of the pull out test as specified in 5.1 of this Standard. 4.4 Where mounted in a vertical position, means shall be provided to prevent the blocks from slip
18、ping or sliding along the mounting rail. The blocks shall remain fixed under application of the same forces specified in 5.1. End anchors which are secured to the mounting rail with screws are preferred for this purpose, and shall be available from approved terminal manufacturers. 4.5 Terminals used
19、 for control conductors sizes AWG 18 through AWG 12 shall accommodate at least 30 blocks per running foot. This requirement does not apply to blocks for control fuses or circuit breakers. 5. 5.1 TESTS: I TERMINAL BLOCK PULLOUT TEST: The terminal block shall not pull out I of its mounting track nor s
20、hall the conductor pull out of its I termination when forces specified are applied for the duration I outlined in Table 12.1 of UL Standard 486E. Each conductor shall withstand a minimum pull out force from the terminal block when such force is applied for one minute as outlined in Table 14.1 of i U
21、L Standard 486E. 5.2 Test results for ampacity, temperature rise, dielectric strength, etc., shall conform to the requirements outlined in UL Standards 4863 and 1059. 5.3 All terminals shall be rated 600 Vat, terminal to terminal, and terminal to ground. This rating is based on compliance with spaci
22、ng requirements and dielectric voltage - withstand tests outlined in UL Standard 1059. Insulation material shall also withstand 65 seconds of the test outlined in ASTM Standard D495. 6. IDENTIFICATION: FORD MANUFACTURING STANDARDS ET1 MARCH 1995 TERMINAL BLOCKS ET1 Page 4 6.1 I Each terminal shall h
23、ave provisions to accommodate a seven digit I identification number. The surface shall accept common pencil, ink, or ball point pen. Computer generated digits/letters are also acceptable. 6.2 Each terminal block shall have the manufacturers name or trademark and type reference shown thereon. 7. APPL
24、ICATION: 7.1 I Terminal blocks shall be applied as outlined in applicable I paragraphs of Ford Electrical Standards for Mass Production I Equipment EXl. 7.2 I Mounting screws shall be installed at least every 500 mm (20 in) I along mounting track. 1 NOTE: Denotes area of change in previous issue. I
