Document ID: chunk:federal_register_of_legislation:F2023L01526:body:0:p42
Version: federal_register_of_legislation:F2023L01526
Segment Type: other
Provision Reference: 
Character Range: 118792–121907

be such that:

        1/(1/(475xU) – 1/Ri) ≤ Ro < 1/(1/(500xU) – 1/Ri)

        where U is the working voltage of the electric power train.

Annex 7A

Verification method for testing authorities confirming document based isolation resistance compliance of electrical design of the vehicle after water exposure

This annex describes the applicable requirements when certifying the manufacturer's high voltage equipment or system components against adverse water effects rather than a physical test. As a general rule, the electrical design or components of the vehicles shall comply with the requirements as specified in paragraphs "5.1.1. Protection against direct contact", "5.1.2. Protection against indirect contact", and "5.1.3. Isolation resistance" respectively and this will be separately verified by the testing authority. Vehicle manufacturers shall provide information to testing authorities to identify, as a point of reference, the mounting location for each high-voltage component in/on the vehicle.

       1. Documentation shall contain the following information:

           (a) on how the manufacturer tested isolation resistance compliance of electrical design of the vehicle by using fresh water;

           (b) on how, after the test had been carried out, the high-voltage component or system was inspected for ingress of water and how, depending on its mounting location, each high voltage component/system met the appropriate degree of protection against water.

       2. The testing authority will verify and confirm the authenticity of documented conditions that have been observed, and should have been complied with, during the process of certification by manufacturer:

       2.1. It is permitted that, during the test, the moisture contained inside the enclosure is partly condensed. The dew which may be deposited is not considered as ingress of water. For the purpose of the tests, the surface area of the tested high-voltage component or system is calculated with an accuracy of 10 per cent. If possible, the tested high-voltage component or system is run energized. If the tested high-voltage component or system is energized, adequate safety precautions are taken.

       2.2. For electrical components, externally attached (e.g. in engine compartment), open underneath, both exposed or protected locations, the testing authority shall verify, with a view to confirming the compliance, whether the test is conducted by spraying the high-voltage component or system from all practicable directions with a stream of water from a standard test nozzle as shown in Figure 1. The following parameters are observed during the test in particular:

       (a) Nozzle internal diameter: 6.3 mm;

       (b) Delivery rate: 11.9 – 13.2 l/min;

       (c) Water pressure at the nozzle: approximately 30 kPa (0.3 bar);

           (d) Test duration per m2 of surface area of the tested high-voltage component or system: 1 min;

       (e) Minimum test duration: 3 min;

           (f) Distance from nozzle to tested high-voltage component or system surface: approximately 3 m (this distance