1. 1  Position of China and Japan  The water test should be included in EVS-GTR Phase 1.  Test exemption for vehicles with isolation monitoring system should be approved.  Scope of Vehicle Water Test China and Japan Proposal for TF1 The scope of Vehicle Water Test should be limited only to the protection against electric shock. The test method and criteria for the protection against fire hazards should be discussed in Phase 2.  Rationale  Isolation resistance should be maintained in normal vehicle operation. Washing and flooding are the typical examples of severe conditions in normal vehicle operation.  Isolation monitoring system is effective as the measure for protection against electric shock. Isolation loss is not an immediate risk for electric shock. Then, providing a warning for isolation loss is an effective protection method against electric shock. GTR No.13 requires isolation monitoring system for FCVs to deal with isolation deterioration of FC coolant. Consistent concept should be approved in EVS-GTR. Test exemption becomes an incentive for vehicle manufacturers to install isolation monitoring systems. EVSTF-08-39e

2. 2  Action item at March EVS-GTR meeting in Tokyo China and Japan provide idea of how to confirm the functionality and reliability of isolation monitoring system. Basically, the provisions for FCVs in GTR No.13 and FMVSS305 are effective to confirm the functionality and reliability of isolation monitoring system. Specific test methods based on FMVSS305 are incorporated in China and Japan proposal. China and Japan Proposal for TF1

3. 6.1.2. Confirmation method for functions of on-board isolation resistance monitoring system The function of the on-board isolation resistance monitoring system shall be confirmed by the following method or a method equivalent to it. A resistor that does not causes the isolation resistance between the terminal being monitored and the electrical chassis to drop below the minimum required isolation resistance value shall be inserted. The warning signal shall be activated. The on-board isolation resistance monitoring system shall be tested using the following procedure. 1.Determine the isolation resistance, Ri, of the high voltage source electric power train with the electrical isolation monitoring system using the procedure outlined in S7.6.2 through S7.6.7 6.1.1. 2.If the minimum isolation resistance value required in accordance with paragraphs 5.1.1.2.4.1 or 5.1.1.2.4.2. is 100 ohm/V, insert a resistor with resistance Ro equal to or greater than 1/(1/(95 times the working voltage of the high voltage source electric power train) - 1/Ri) and less than 1/(1/(100 times the working voltage of the high voltage source electric power train) - 1/Ri) between the positive terminal of the high voltage source electric power train and the electrical chassis. 3 Current EVS-GTR Draft Additional Text Proposal based on FMVSS305 Proposed text form China and Japan China and Japan Proposal for TF1

4. 4 3.If the minimum isolation resistance value required in accordance with paragraphs 5.1.1.2.4.1 or 5.1.1.2.4.2. is 500 ohm/V, insert a resistor with resistance Ro equal to or greater than 1/(1/(475 times the working voltage of the electric power train) - 1/Ri) and less than 1/(1/(500 times the working voltage of the electric power train) - 1/Ri) between the terminal of the electric power train and the electrical chassis. 4.The electrical isolation monitoring system indicator shall display a warning visible to the driver seated in the driver’s designated seating position. Additional Text Proposal based on FMVSS305 Proposed text form China and Japan China and Japan Proposal for TF1

5. 5.X Protection against water effects (EVS-08-17e) Protection against water effects shall be provided by an isolation resistance monitoring system, or by protecting or shielding the voltage class B equipment from exposure to water. If the vehicle is equipped with an isolation resistance monitoring system, the requirements of 5.X.1 shall apply. If the vehicle is not equipped with an isolation resistance monitoring system, the tests given in 6.X.1 shall be performed in order that the requirements of 5.X.2 are met. 5.X.1 If an isolation resistance monitoring system is provided, and the isolation resistance less than the requirements given in 5.1.1.2.4 is detected, a warning shall be indicated to the driver. The function of the on-board isolation resistance monitoring system shall be confirmed as described in 6.1.2. 5.X.2 If the test procedures specified in 6.X.1 are performed, just after each exposure, and with the vehicle still wet, the vehicle shall then comply with isolation resistance test given in 6.1.1, and the isolation resistance requirements given in 5.1.1.2.4 shall be met. In addition, after a 24 h pause, the isolation resistance test specified in 6.1.1 shall again be performed, and the isolation resistance requirements given in 5.1.1.2.4 shall be met. 5 Current EVS-GTR Draft Specifications for Isolation monitoring system Confirmation of the isolation resistance monitoring system performance is already required in current EVS-GTR draft.

6. 6.1.2. Confirmation method for functions of on-board isolation resistance monitoring system The function of the on-board isolation resistance monitoring system shall be confirmed by the following method or a method equivalent to it. A resistor that does not cause the isolation resistance between the terminal being monitored and the electrical chassis to drop below the minimum required isolation resistance value shall be inserted. The warning signal shall be activated. 6 This part is the confirmation procedures for the isolation monitoring system function based on EVS No.13. Current EVS-GTR Draft Specifications for Isolation monitoring system

7. 7 FMVSS305 Specifications in FMVSS305NPRM S5.4.4 Electrical isolation monitoring. Each DC high voltage sources of vehicles with a fuel cell system shall be monitored by an electrical isolation monitoring system that displays a warning for loss of isolation when tested according to S8. The system must monitor its own readiness and the warning display must be visible to the driver seated in the driver's designated seating position. FMVSS305 requires the isolation monitoring system for FCVs.

8. S8. Test procedure for on-board electrical isolation monitoring system. Prior to any impact test, the requirements of S5.4 for the on-board electrical isolation monitoring system shall be tested using the following procedure. 1.The electric energy storage device is at the state of charge specified in S7.1. 2.The switch or device that provides power from the high voltage system to the propulsion motor(s) is in the activated position or the ready-to-drive position. 3.Determine the isolation resistance, Ri, of the high voltage source with the electrical isolation monitoring system using the procedure outlined in S7.6.2 through S7.6.7. 4.Insert a resistor with resistance Ro equal to or greater than 1/(1/(95 times the working voltage of the high voltage source) - 1/Ri) and less than 1/(1/(100 times the working voltage of the high voltage source) - 1/Ri) between the positive terminal of the high voltage source and the electrical chassis. 5.The electrical isolation monitoring system indicator shall display a warning visible to the driver seated in the driver’s designated seating position. 8 Confirmation of the isolation monitoring system function is required in FMVSS305. It’s more specific than current EVS-GTR draft. Paragraph 2. to 5. is referred in China and Japan proposal.  See next page. FMVSS305 Specifications in FMVSS305NPRM

9. 9 insert a resistor with resistance Ro equal to or greater than 1/(1/(95 times the working voltage of the electric power train) - 1/Ri) and less than 1/(1/(100 times the working voltage of the electric power train) 1 95 ×Vb － Ri 1 1 1 100 ×VbRi 11 < R0 ＋ Explanation regarding newly inserted calculation formula Battery MOT Inverter Ri R0 Ri: Isolation resistance of vehicle system Vehicle chassis R0: Isolation resistance to be inserted 1 100 ×Vb － Ri 1 1 <R0< < 1 95 ×Vb Resistance value at 100ohms/VResistance value at 95ohms/V 95 ohms/V < Combined resistance of R1 and R0 < 100 ohms/V 95% value of 100 ohms/V Isolation monitoring system for 100 ohms/v detection

10. 10 insert a resistor with resistance Ro equal to or greater than 1/(1/(475 times the working voltage of the electric power train) - 1/Ri) and less than 1/(1/(500 times the working voltage of the electric power train) 1 475 ×Vb － Ri 1 1 1 500 ×VbRi 11 < R0 ＋ Battery MOT Inverter Ri R0 Ri: Isolation resistance of vehicle system Vehicle chassis R0: Isolation resistance to be inserted 1 500 ×Vb － Ri 1 1 <R0< < 1 475 ×Vb Resistance value at 100ohms/VResistance value at 95ohms/V 95% value of 500 ohms/V 475 ohms/V < Combined resistance of R1 and R0 < 100 ohms/V Isolation monitoring system for 500 ohms/v detection Explanation regarding newly inserted calculation formula