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EV.7.4.1 All Tractive System connections must:
a. Be designed to use intentional current paths through conductors such as copper or aluminum
b. Not rely on steel bolts to be the primary conductor
c. Not include compressible material such as plastic in the stack-up
EV.7.4.2 If external, uninsulated heat sinks are used, they must be properly grounded to the GLV System Ground, see EV.7.7
EV.7.4.3 All electrical connections, including bolts, nuts, and other fasteners, in the high current path of the Tractive System must be secured from unintentional loosening by the use of Positive Locking Mechanisms that are suitable for high temperatures.
Lock washers and thread locking compounds (Loctite®), DO NOT meet the positive locking requirement. Nyloc nuts do not meet the temperature requirements.
EV.7.4.4 When a Positive Locking Mechanism is required that cannot easily be inspected, information about this item must be presented at Electrical Technical Inspection