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EV.7.5.1 Separation of Tractive System and GLV System:
a. The entire Tractive System and GLV System must be completely galvanically separated.
b. The border between Tractive and GLV System is the galvanic isolation between both systems. Therefore, some components, such as the Motor Controller, may be part of both systems.
EV.7.5.2 There must be no connection between the Chassis of the vehicle (or any other conductive surface that might be inadvertently touched by a person), and any part of any Tractive System circuits.
EV.7.5.3 Tractive System and GLV circuits must not run through the same conduit or connector, except as allowed in EV.8.9.4
EV.7.5.4 GLV Systems other than the AIRs EV.6.4, parts of the Precharge and Discharge Circuits EV.6.6, HV DC/DC converters, the AMS EV.8.3, the IMD EV.8.6, parts of the TSAL EV.9.2.1 and cooling fans must not be inside the Accumulator Container.
EV.7.5.5 Where both Tractive System and GLV are included inside an enclosure, they must meet one of:
a. Be separated by insulating barriers (in addition to the insulation on the wire) made of moisture resistant, UL recognized or equivalent insulating materials rated for 150° C or higher (such as Nomex based electrical insulation)
b. Maintain the following spacing through air, or over a surface (similar to those defined in UL1741):
U < 100 V DC 10 mm
100 V DC < U < 200 V DC 20 mm
U > 200 V DC 30 mm
EV.7.5.6 Spacing must be clearly defined. Components and cables capable of movement must be positively restrained to maintain spacing.
EV.7.5.7 If Tractive System and GLV are on the same circuit board:
a. They must be on separate, clearly defined and clearly marked areas of the board
b. Required spacing related to the spacing between traces / board areas are as follows:
Voltage | Over Surface | Thru Air (cut in board) | Under Conformal Coating |
0-50 V DC | 1.6 mm | 1.6 mm | 1 mm |
50-150 V DC | 6.4 mm | 3.2 mm | 2 mm |
150-300 V DC | 9.5 mm | 6.4 mm | 3 mm |
300-600 V DC | 12.7 mm | 9.5 mm | 4 mm |
EV.7.5.8 Teams must be prepared to demonstrate spacing on team built equipment.
For inaccessible circuitry, spare boards or appropriate photographs must be available for inspection.
EV.7.5.9 All connections to external devices such as laptops from a Tractive System component must include galvanic isolation.