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BS EN 3475-603:2018

BS EN 3475-603:2018

$102.76

Aerospace series. Cables, electrical, aircraft use. Test methods – Resistance to wet arc tracking

Published By Publication Date Number of Pages
BSI 2018 16
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This European standard specifies a method of assessing the behaviour of cable insulation subject to an electric arc initiated and maintained by contaminating fluid along the surface of the insulation. This standard shall be used together with EN 3475-100. The primary aim of this test is: ? to produce, in a controlled fashion, continuous failure effects, which are representative of those, which may occur in service when a typical cable bundle is damaged and subjected to aqueous fluid contamination. Electrical arcing occurs along the surface of the insulation between damage sites on adjacent cables; and ? to examine the aptitude of the insulation to track, to propagate electric arc to the electrical origin. Originally defined for 115 Vac network, this test also proposes conditions for 230 Vac network. Unless otherwise specified in product standard, only 115 Vac conditions shall be satisfied. Six levels of prospective fault current have been specified for concerned cable sizes (see Clause 7). It is agreed that sizes larger than 051 need not be assessed since the short-circuit phenomenon becomes dominant at low line impedances. Unless otherwise specified in the technical/product standard sizes 002, 006 and 020 cable shall be assessed.

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PDF Pages PDF Title
2 undefined
6 1 Scope
2 Normative references
3 Specimen requirements
7 4 Preparation of specimen
8 5 Apparatus
5.1 Electrical equipment
10 5.2 Test equipment
5.3 Test protocol
5.3.1 The procedure embraces copper cable sizes 001 to 051 (26 to 10) or aluminium cable sizes 002 to 051 (24 to 10) and for each size six (6) values of prospective maximum fault current to be set by adjustment of resistances Rf have been defined in Table 1 or Table 2. Performance of the cable at a given fault current shall be determined by testing three specimens. Thus 18 specimens are required for each cable size.
11 5.3.2 For the purpose of cable qualification at least sizes 002, 006 and 020 shall be tested. Additional testing of other sizes may be deemed necessary in particular cases and values of prospective fault currents, the ratings of thermal breaker protection which are typical of aircraft use have been included in Table 3.
5.3.3 It is emphasised that electrical arcing tests are essentially destructive and can be hazardous to personnel. Therefore tests should be undertaken with all observers shielded from direct physical and visual exposure as noted in 5.2 b). The use of video recording for all tests is required.
5.4 Test rig set-up
5.4.1 Install the rating of circuit breaker appropriate to the cable type and size to be tested (Table 3).
5.4.2 Heavy-duty electrical connections shall be fitted in substitution of test specimen to enable prospective fault currents to be set by adjustment of resistances Rf. Because these currents would trip the thermal breakers very rapidly these shall be shunted to permit the pulsing of current until the desired value is obtained. Re-instate the thermal protection.
5.4.3 Prepare an electrolyte solution made by dissolving (3 ± 0,5) % by weight of sodium chloride in distilled water.
5.4.4 Support the specimen in free air inclined at an angle of 10° to the horizontal with the electrical input connections at the higher end and with the cables forming the test zone uppermost.
5.4.5 Position the delivery system so that the electrolyte contacts the loom from a height of (10 ( 2) mm above the uppermost cables in the loom at a point which shall position the droplets into the upper cut or no more than 2 mm towards the higher end of the specimen. Ensure that the drops strike the cables in the middle of the test zone, the top centre of the circumference such that they fall into the crevice between cables at A1 and B1.
6 Method
6.1 Test procedure
6.1.1 Install a test specimen with electrical connections as shown in Figure 1 and with Rf set, as in 5.4.2 above, to give the required fault current specified in Table 1.
6.1.2 Apply electrical power to the specimen and start the flow of electrolyte at a rate of (100 ( 10) mg/min. Particular care should be taken to ensure that the electrolyte flows between the damage sites as the evidenced by the steaming of the electrolyte and the development of scintillation.
6.1.3 Run the test continuously for a period of 8 hours or until an automatic shutdown (CB tripping or/and an extinction of lamps occur), whichever is the sooner.
6.1.4 In the event of an automatic shutdown adopt the following procedure:
12 6.2 Examination
6.3 Test report
7 Requirements

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BS EN 3475-603:2018
$102.76