Common use of Fourth Step Clause in Contracts

Fourth Step. If U1 is greater than or equal to U2, insert a standard known resistance (Ro) between the negative side of the high voltage bus and the electrical chassis. With Ro installed, measure the voltage (U1’) between the negative side of the high voltage bus and the electrical chassis (see Figure 2). Calculate the electrical isolation (Ri) according to the following formula: Ri = Ro*Ub*(1/U1’ – 1/U1) Figure 2 Measurement of U1’ Electrical Chassis Energy Conversion System Assembly REESS Assembly High Voltage Bus + + Energy Conversion System - REESS Ub - U1´ Ro Traction System Electrical Chassis If U2 is greater than U1, insert a standard known resistance (Ro) between the positive side of the high voltage bus and the electrical chassis. With Ro installed, measure the voltage (U2’) between the positive side of the high voltage bus and the electrical chassis (see Figure 3). Calculate the electrical isolation (Ri) according to the formula shown. Divide this electrical isolation value (in Ω) by the nominal operating voltage of the high voltage bus (in volts). Calculate the electrical isolation (Ri) according to the following formula: Ri = Ro*Ub*(1/U2’ – 1/U2) Figure 3 Measurement of U2’ Electrical Chassis Energy Conversion System Assembly Ro REESS Assembly U2' High Voltage Bus + + Energy Conversion System - Traction System REESS - Electrical Chassis

Fourth Step. If U1 V1 is greater than or equal to U2V2, insert a standard known resistance (Ro) between the negative side of the high voltage bus and the electrical chassis. With Ro installed, measure the voltage (U1V1’) between the negative side of the high voltage bus and the electrical chassis (see Figure 2). Calculate the electrical isolation (Ri) according to the following formula: Ri = Ro*Ub*(1Ro*(Vb/U1V1’ – Vb/V1) or Ri = Ro*Vb*(1/V1’ – 1/U1V1) Figure 2 Measurement of U1’ Electrical Chassis Energy Conversion System Assembly REESS Assembly High Voltage Bus + + Energy Conversion System - REESS Ub SS Vb - U1V1´ Ro Traction System REE Electrical Chassis If U2 V2 is greater than U1V1, insert a standard known resistance (Ro) between the positive side of the high voltage bus and the electrical chassis. With Ro installed, measure the voltage (U2V2’) between the positive side of the high voltage bus and the electrical chassis (see Figure 3). Calculate the electrical isolation (Ri) according to the formula shown. Divide this electrical isolation value (in Ω) by the nominal operating voltage of the high voltage bus (in volts). Calculate the electrical isolation (Ri) according to the following formula: Ri = Ro*Ub*(1Ro*(Vb/U2V2’ – Vb/V2) or Ri = Ro*Vb*(1/V2’ – 1/U2V2) Figure 3 Measurement of U2’ Electrical Chassis Energy Conversion System Assembly Ro REESS Assembly U2V2' High Voltage Bus + + Energy Conversion System - Traction System REESS - Electrical Chassis

Fourth Step. If U1 V1 is greater than or equal to U2V2, insert a standard known resistance (Ro) between the negative side of the high voltage bus and the electrical chassis. With Ro installed, measure the voltage (U1V1’) between the negative side of the high voltage bus and the electrical chassis (see Figure 2). Calculate the electrical isolation (Ri) according to the following formula: Ri = Ro*Ub*(1Ro*(Vb/U1V1’ – Vb/V1) or Ri = Ro*Vb*(1/V1’ – 1/U1V1) Figure 2 Measurement of U1V1’ Electrical Chassis Energy Conversion System Assembly REESS RESS Assembly High Voltage Bus + + Energy Conversion System - REESS Ub RESS Traction System Vb - U1V1´ Ro Traction System Electrical Chassis If U2 V2 is greater than U1V1, insert a standard known resistance (Ro) between the positive side of the high voltage bus and the electrical chassis. With Ro installed, measure the voltage (U2V2’) between the positive side of the high voltage bus and the electrical chassis (see Figure 3). Calculate the electrical isolation (Ri) according to the formula shown. Divide this electrical isolation value (in ΩΩ) by the nominal operating voltage of the high voltage bus (in volts). Calculate the electrical isolation (Ri) according to the following formula: Ri = Ro*Ub*(1Ro*(Vb/U2V2’ – Vb/V2) or Ri = Ro*Vb*(1/V2’ – 1/U2V2) Figure 3 Measurement of U2V2’ Electrical Chassis Energy Conversion System Assembly Ro REESS Assembly U2RESS Assexxxx X0' High Voltage Bus + + Energy Conversion System - Traction System REESS RESS - Electrical Chassis

Fourth Step. If U1 is greater than or equal to U2, insert a standard known resistance (Ro) between the negative side of the high voltage bus and the electrical chassis. With Ro installed, measure the voltage (U1’) between the negative side of the high voltage bus and the electrical chassis (see Figure 2). Calculate the electrical isolation (Ri) according to the following formula: Ri = Ro*Ub*(1/U1’ – 1/U1) Figure 2 Measurement of U1’ Electrical Chassis Energy Conversion System Assembly REESS Assembly High Voltage Bus + + Energy Conversion System - REESS Ub - U1´ Ro Traction System Electrical Chassis If U2 is greater than U1, insert a standard known resistance (Ro) between the positive side of the high voltage bus and the electrical chassis. With Ro installed, measure the voltage (U2’) between the positive side of the high voltage bus and the electrical chassis (see Figure 3). Calculate the electrical isolation (Ri) according to the formula shown. Divide this electrical isolation value (in Ω) by the nominal operating voltage of the high voltage bus (in volts). Calculate the electrical isolation (Ri) according to the following formula: Ri = Ro*Ub*(1/U2’ – 1/U2) Figure 3 Measurement of U2V2’ Electrical Chassis Energy Conversion System Assembly Ro REESS Assembly U2V2' High Voltage Bus + + Energy Conversion System - Traction System REESS - Electrical Chassis

Fourth Step. If U1 is greater than or equal to U2, insert a standard known resistance (Ro) is inserted between the negative side of the high voltage bus and the electrical chassis. With Ro installed, measure the voltage (U1’') between the negative side of the high voltage bus and the electrical chassis is measured (see Figure 25). Calculate the The electrical isolation (Ri) is calculated according to the following formula: Ri = Ro*Ub*(1/U1’ ' – 1/U1) Figure 2 5 Measurement of U1’ Electrical Chassis Energy Conversion System Assembly REESS Assembly High Voltage Bus + + Energy Conversion System - REESS Ub - U1´ Ro ’ R0 Traction System Electrical Chassis If U2 is greater than U1, insert a standard known resistance (Ro) between the positive side of the high voltage bus and the electrical chassis. With Ro installed, measure the voltage (U2’) between the positive side of the high voltage bus and the electrical chassis (see Figure 36 below). Calculate the The electrical isolation (Ri) according to the formula shown. Divide this electrical isolation value (in Ω) by the nominal operating voltage of the high voltage bus (in volts). Calculate the electrical isolation (Ri) is calculated according to the following formula: Ri = Ro*Ub*(1/U2’ – 1/U2) Figure 3 6 Measurement of U2’ Electrical Chassis Energy Conversion System Assembly Ro REESS Assembly U2' High Voltage Bus + + Energy Conversion System - Traction System REESS - Electrical Chassis

Fourth Step. If U1 V1 is greater than or equal to U2V2, insert a standard known resistance (Ro) between the negative side of the high voltage bus and the electrical chassis. With Ro installed, measure the voltage (U1V1’) between the negative side of the high voltage bus and the electrical chassis (see Figure 2). Calculate the electrical isolation (Ri) according to the following formula: Ri = Ro*Ub*(1Ro*(Vb/U1V1’ – Vb/V1) or Ri = Ro*Vb*(1/V1’ – 1/U1V1) Figure 2 Measurement of U1’ Electrical Chassis Energy Conversion System Assembly REESS Assembly High Voltage Bus + + Energy Conversion System - REESS Ub SS Vb - U1V1´ Ro Traction System Electrical Chassis If U2 V2 is greater than U1V1, insert a standard known resistance (Ro) between the positive side of the high voltage bus and the electrical chassis. With Ro installed, measure the voltage (U2V2’) between the positive side of the high voltage bus and the electrical chassis (see Figure 3). Calculate the electrical isolation (Ri) according to the formula shown. Divide this electrical isolation value (in Ω) by the nominal operating voltage of the high voltage bus (in volts). Calculate the electrical isolation (Ri) according to the following formula: Ri = Ro*Ub*(1Ro*(Vb/U2V2’ – Vb/V2) or Ri = Ro*Vb*(1/V2’ – 1/U2V2) Figure 3 Measurement of U2’ Electrical Chassis Energy Conversion System Assembly Ro REESS Assembly U2V2' High Voltage Bus + + Energy Conversion System - Traction System REESS - Electrical Chassis