政策法规现行有效美国危险品合规

§ 173.176 Capacitors.

效力	法规类型	发布日期	生效日期	发文机构
现行有效	部门规章	2026-08-07	2026-09-08	Code of Federal Regulations (CFR) - Transportation (Title 49)

发布08-07

生效09-08

摘要总结AI 辅助解读

本法规（49 CFR § 173.176）规定了电容器在美国运输中的危险品合规要求。核心在于根据电容器的能量存储容量（Wh）、是否含危险电解质以及是否为非对称电容器，划分不同的豁免与监管等级。≤10 Wh（非对称≤20 Wh）且通过跌落测试的通常可豁免；高能量或含危险电解质的需满足短路保护、压力释放及包装要求。所有受管制的电容器必须标记能量容量。

(a) Capacitors, including capacitors containing an electrolyte that does not meet the definition of any hazard class or division as defined in this part, must conform to the following requirements:

- (1) Except for asymmetric capacitors, capacitors not installed in equipment must be transported in an uncharged state.

- (2) Each capacitor or module must be protected against a potential short circuit hazard in transport as follows:

(i) Except for asymmetric capacitors, when a capacitor's energy storage capacity is less than or equal to 10 Wh or when the energy storage capacity of each capacitor in a module is less than or equal to 10 Wh, the capacitor or module must be protected against short circuit or be fitted with a metal strap connecting the terminals; or

- (ii) Except for asymmetric capacitors, when the energy storage capacity of a capacitor or a capacitor in a module is more than 10 Wh, the capacitor or module must be fitted with a metal strap connecting the terminals.

- (iii) When an asymmetric capacitor's energy storage capacity is greater than 0.3 Wh, or when the energy storage capacity of each capacitor in a module is greater than 0.3 Wh, the capacitor or module must be protected against short circuit.

- (3) Capacitors containing an electrolyte that meets the definition of one or more hazard class or division as defined in this part, must be designed to withstand a 95 kPa (0.95 bar, 14 psi) pressure differential.

- (4) Capacitors must be designed and constructed to safely relieve pressure that may build up in use, through a vent or a weak point in the capacitor casing. Any liquid that is released upon venting must be contained by the packaging or by the equipment in which a capacitor is installed.

- (5) Except for asymmetric capacitors, capacitors manufactured after December 31, 2013, or asymmetric capacitors manufactured after December 31, 2015, must be marked with the energy storage capacity in Wh.

(b) Capacitors must be packed in strong outer packagings. For transport by air, capacitors must be securely cushioned within the outer packagings. Capacitors installed in equipment may be offered for transport unpackaged or on pallets, when the capacitors are afforded equivalent protection by the equipment in which they are contained.
(c) Capacitors containing an electrolyte not meeting the definition of any hazard class or division as defined in this part, including when configured in a module or when installed in equipment, are not subject to any other requirements of this subchapter.
(d) Except for asymmetric capacitors, capacitors containing an electrolyte that meets the definition of one or more hazard class or division as defined in this part, with an energy storage capacity of 10 Wh or less are not subject to any other requirements of this subchapter, when they are capable of withstanding a 1.2 m (3.9 feet) drop test unpackaged onto a rigid, non-resilient, flat and horizontal surface without loss of contents.
(e) Asymmetric capacitors containing an electrolyte that meets the definition of one or more hazard class or division as defined in this part, with an energy storage capacity of 20 Wh or less, including when configured in a module, are not subject to other provisions of this subchapter when the capacitors are capable of withstanding a 1.2 meter (3.9 feet) drop test unpackaged onto a rigid, non-resilient, flat and horizontal surface without loss of contents.
(f) Except for asymmetric capacitors, capacitors containing an electrolyte meeting the definition of one or more hazard class or division as defined in this part, that are not installed in equipment, and with an energy storage capacity of more than 10 Wh are subject to the requirements of this subchapter.
(g) Asymmetric capacitors containing an electrolyte meeting the definition of one or more hazard class or division as defined in this part, that are not installed in equipment, and with an energy storage capacity of more than 20 Wh are subject to the requirements of this subchapter.
(h) Capacitors installed in equipment and containing an electrolyte meeting the definition of one or more hazard class or division as defined in this part, are not subject to any other requirements of this subchapter, provided the equipment is packaged in a strong outer packaging and in such a manner as to prevent accidental functioning of the capacitors during transport. Large, robust equipment containing capacitors may be offered for transport unpackaged or on pallets when the capacitors are afforded equivalent protection by the equipment in which they are contained.

[80 FR 1159, Jan. 8, 2015, as amended at 85 FR 83398, Dec. 21, 2020]