FMVSS 303 PDF

The interior of the cabinet is mm long, mm deep and mm high. It has a glass observation window in the front, a closable opening to permit insertion of the specimen holder and a hole to accommodate tubing for a gas burner. For ventilation, it has a 13mm clearance space around the top of the cabinet, ten holes in the base of the cabinet, each hole 19mm in diameter and legs to elevate the bottom of the cabinet by 10mm, all located as shown in Figure 1. The interior dimensions of the U-shaped frames are 51mm wide by mm long. A specimen that softens and bends at the flaming end so as to cause erratic burning is kept horizontal by supports consisting of thin, heat resistant wires, spanning the width of the U-shaped frame under the specimen at 25mm intervals.

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Section Standard No. This standard applies to passenger cars, and to multipurpose passenger vehicles , trucks and buses with a GVWR of 4, kg or less, that use electrical propulsion components with working voltages more than 60 volts direct current VDC or 30 volts alternating current VAC , and whose speed attainable over a distance of 1.

Automatic disconnect means a device that when triggered, conductively separates a high voltage source from the electric power train or the rest of the electric power train.

Charge connector is a conductive device that, by insertion into a vehicle charge inlet, establishes an electrical connection of the vehicle to the external electric power supply for the purpose of transferring energy and exchanging information. Connector means a device providing mechanical connection and disconnection of high voltage electrical conductors to a suitable mating component, including its housing. Direct contact is the contact of persons with high voltage live parts.

Electric energy storage device means a high voltage source that stores energy for vehicle propulsion. This includes, but is not limited to, a high voltage battery or battery pack, rechargeable energy storage device, and capacitor module.

This includes, but is not limited to, a high voltage battery or battery pack, fuel cell stack, rechargeable energy storage device, and capacitor module. This includes, but is not limited to, high voltage batteries or battery packs, fuel cell stacks, rechargeable energy storage systems, capacitor modules, inverters, interconnects, and venting systems. Electrical chassis means conductive parts of the vehicle whose electrical potential is taken as reference and which are: 1 conductively linked together, and 2 not high voltage sources during normal vehicle operation.

Electrical protection barrier is the part providing protection against direct contact with high voltage live parts from any direction of access. Exposed conductive part is the conductive part that can be touched under the provisions of the IPXXB protection degree and that is not normally energized, but that can become electrically energized under isolation fault conditions.

This includes parts under a cover, if the cover can be removed without using tools. External electric power supply is a power supply external to the vehicle that provides electric power to charge the electric energy storage device in the vehicle through the charge connector.

Fuel cell system is a system containing the fuel cell stack s , air processing system, fuel flow control system, exhaust system, thermal management system, and water management system.

High voltage live part means a live part of a high voltage source. High voltage source means any electric component which is contained in the electric power train or conductively connected to the electric power train and has a working voltage greater than 30 VAC or 60 VDC. Indirect contact is the contact of persons with exposed conductive parts.

Live part is a conductive part of the vehicle that is electrically energized under normal vehicle operation. Luggage compartment is the space in the vehicle for luggage accommodation, separated from the passenger compartment by the front or rear bulkhead and bounded by a roof, hood or trunk lid , floor, and side walls, as well as by electrical protection barriers provided for protecting the occupants from direct contact with high voltage live parts. Passenger compartment is the space for occupant accommodation that is bounded by the roof, floor, side walls, doors, outside glazing, front bulkhead and rear bulkhead or rear gate, as well as electrical protection barriers provided for protecting the occupants from direct contact with high voltage live parts.

Possible active driving mode is the vehicle mode when application of pressure to the accelerator pedal or activation of an equivalent control or release of the brake system causes the electric power train to move the vehicle. Propulsion system means an assembly of electric or electro-mechanical components or circuits that propel the vehicle using the energy that is supplied by a high voltage source. Service disconnect is the device for deactivation of an electrical circuit when conducting checks and services of the vehicle electrical propulsion system.

VAC means volts of alternating current AC expressed using the root mean square value. VDC means volts of direct current DC. Vehicle charge inlet is the device on the electric vehicle into which the charge connector is inserted for the purpose of transferring energy and exchanging information from an external electric power supply. Working Voltage means the highest root mean square voltage of the voltage source, which may occur across its terminals or between its terminals and any conductive parts in open circuit conditions or under normal operating conditions.

General requirements. Each vehicle to which this standard applies, must meet the requirements in S5. Not more than 5. Spillage is measured from the time the vehicle ceases motion after a barrier impact test until 30 minutes thereafter, and throughout any static rollover after a barrier impact test. After each test specified in S6 of this standard, each high voltage source in a vehicle must meet one of the following requirements : electrical isolation requirements of subparagraph a , the voltage level requirements of subparagraph b , or the physical barrier protection requirements of subparagraph c.

In addition, the resistance between an exposed conductive part of the electrical protection barrier of the high voltage source and any other simultaneously reachable exposed conductive parts of electrical protection barriers within 2.

In addition, the voltage between an exposed conductive part of the electrical protection barrier of the high voltage source and any other simultaneously reachable exposed conductive parts of electrical protection barriers within 2. The symbol shown in Figure 6 shall be present on or near electric energy storage devices. The symbol in Figure 6 shall also be visible on electrical protection barriers which, when removed, expose live parts of high voltage sources. The symbol shall be yellow and the bordering and the arrow shall be black.

Markings are not required for electrical connectors or the vehicle charge inlet. Cables for high voltage sources which are not located within electrical protection barriers shall be identified by having an outer covering with the color orange.

For a service disconnect which can be opened, disassembled, or removed without tools, protection degree IPXXB shall be provided when tested under procedures specified in S9.

All connectors shall provide direct contact protection by: a Meeting the requirements specified in S5. Direct contact protection for a vehicle charge inlet shall be provided by meeting the requirements specified in S5.

The electrical isolation of a high voltage source , determined in accordance with the procedure specified in S7. A high voltage source that is conductively connected to an electric component which is conductively connected to the electrical chassis and has a working voltage less than or equal to 60 VDC , is not required to meet the electrical isolation requirements in S5.

The electrical isolation is measured at the high voltage live parts of the vehicle charge inlet and determined in accordance with the procedure specified in S7.

During the measurement, the rechargeable electric energy storage system may be disconnected. 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.

For motor vehicles with an electric energy storage device that can be charged through a conductive connection with a grounded external electric power supply , a device to enable conductive connection of the electrical chassis to the earth ground shall be provided.

This device shall enable connection to the earth ground before exterior voltage is applied to the vehicle and retain the connection until after the exterior voltage is removed from the vehicle.

At least a momentary indication shall be given to the driver each time the vehicle is first placed in possible active driving mode after manual activation of the propulsion system. When leaving the vehicle, the driver shall be informed by an audible or visual signal if the vehicle is still in the possible active driving mode. If the on-board electric energy storage device can be externally charged, vehicle movement of more than mm by its own propulsion system shall not be possible as long as the charge connector of the external electric power supply is physically connected to the vehicle charge inlet in a manner that would permit charging of the electric energy storage device.

Test requirements. The vehicle must meet the requirements of S5. Test conditions. When the vehicle is tested according to S6, the requirements of S5. All measurements for calculating voltage s and electrical isolation are made after a minimum of 5 seconds after the vehicle comes to rest in tests specified in S6.

Where a range is specified, the vehicle must be capable of meeting the requirements at all points within the range. In a test conducted under S6. Each dummy is restrained only by means that are installed in the vehicle for protection at its seating position. In addition to the conditions of S7. Bypass any devices or systems that do not allow the propulsion system to be energized at the time of impact when the vehicle ignition is on and the vehicle is in neutral.

For a high voltage source that has an automatic disconnect that is physically contained within itself, the electrical isolation measurement after the test is made from the side of the automatic disconnect connected to the electric power train or to the rest of the electric power train if the high voltage source is a component contained in the power train.

For a high voltage source that has an automatic disconnect that is not physically contained within itself, the electrical isolation measurement after the test is made from both the high voltage source side of the automatic disconnect and from the side of the automatic disconnect connected to the electric power train or to the rest of the electric power train if the high voltage source is a component contained in the power train.

Before any vehicle impact test, Vb is equal to or greater than the nominal operating voltage as specified by the vehicle manufacturer.

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Section Standard No. This standard specifies requirements for the integrity of motor vehicle fuel systems using compressed natural gas CNG , including the CNG fuel systems of bi-fuel, dedicated, and dual fuel CNG vehicles. The purpose of this standard is to reduce deaths and injuries occurring from fires that result from fuel leakage during and after motor vehicle crashes.

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