Electric detonators are initiated by an electrical impulse sent through lead wires, making them suitable for remote or precisely timed blasting. Detonating caps (non-electric) are initiated by a detonating cord or shock tube. The initiation mechanism — electrical versus mechanical/shock — is the defining criterion between the two subheadings.

Yes. All articles in this heading, including safety fuses, are classified as explosive materials under ATF regulations and require an import permit before entry into the United States. Importers should also ensure compliance with DOT packaging and labeling requirements for Class 1 hazardous materials.