S1. Scope. This standard specifies requirements for limitation of electrolyte spillage and retention of electric energy storage/conversion devices during and after. NHTSA is issuing this final rule to amend Federal Motor Vehicle Safety Standard (FMVSS) No. , “Electric-powered vehicles: Electrolyte. FMVSS No. was originally drafted based on a voluntary consensus standard, the Society of Automotive Engineers (SAE) Recommended.

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Each dummy is restrained only by means that fmvsw installed in the vehicle for protection at its seating position. In a test conducted under S6. The vehicle must meet the requirements of S5. 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 ffmvss component contained in the power train.

If the probe partly or fully penetrates into the electrical protection barrier, it is placed in every possible position to evaluate contact with high voltage live parts. Electrical chassis means conductive parts of the vehicle whose electrical potential is taken as reference and which are: 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.

The resistance between two exposed conductive parts of electrical protection barriers that are less than 2. Service disconnect is the device for deactivation of an electrical circuit when conducting checks and services of the vehicle electrical propulsion system. The symbol shall be yellow and the bordering and the arrow shall be black. Electric energy storage device means a high voltage source that stores energy for vehicle propulsion.

Where a range is specified, the vehicle must be capable of meeting the requirements at all points within the range. The symbol shown in Figure 6 shall be present on or near electric energy storage devices. When the vehicle is tested according to S6, the requirements of S5.


The electric energy storage device shall be at the state-of-charge specified in either subparagraph abor c:. Live part is a conductive part of the vehicle that is electrically energized under normal vehicle operation. During and after each test specified in S6 of this standard:.

This standard applies to passenger cars, and to multipurpose passenger vehiclestrucks and buses with a GVWR of rmvss, kg or less, that use electrical propulsion components with working voltages more than 60 volts direct current VDC or 30 volts alternating current VACand whose speed attainable over a distance of 1. Not more than 5. 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.

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.

Electrical protection barrier is the part providing protection against direct contact with high voltage live parts from any direction of access. Direct contact protection for a connector shall be provided by meeting the requirements specified in S5. More limitations on accuracy are described at the GPO site. 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.

FMVSS 305: Electrolyte spillage and electrical shock protection for electric-powered vehicles

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.

For fmbss purpose of determining the voltage level of the high voltage source specified in S5. During the measurement, the rechargeable electric energy storage system may be disconnected.

Prior to any impact test, the requirements of S5. 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.


Charge connector is a conductive device mfvss, 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. Each vehicle to which this standard applies, must meet the requirements in S5.

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 lidfloor, and side walls, as well as by electrical protection barriers provided for protecting the occupants from direct contact with high voltage live parts.

S9 Test methods for physical barrier protection from electric shock due to direct and indirect contact with high voltage sources. 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. Markings are not required for electrical connectors or the vehicle charge inlet.

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

FMVSS Electrolyte spillage and electrical shock protection for electric-powered vehicles

Voltages V1 and V2 are measured between the source and the electrical chassis. VAC means volts of alternating current AC expressed using the root mean square value. Before any vehicle impact test, Vb is equal to or greater than the nominal operating voltage as specified by the vehicle manufacturer. Electrical isolation of a high voltage source in the vehicle means the electrical resistance between the high voltage source and any of the vehicle’s electrical chassis divided by the working voltage of the high voltage source.

Last modified: April 20, 2020