An open splice is when two or more electrical conductors are joined together without being properly enclosed in a junction box or protected by wire nuts, crimps, or other approved methods. This type of connection is dangerous for several reasons:
Shock Hazard – Exposed conductors increase the risk of electric shock if someone accidentally touches them. This is especially dangerous in areas with moisture or metal surfaces that can conduct electricity.
Fire Hazard – Open splices often result in loose connections, which create heat and arcing. Over time, this can ignite nearby materials, leading to an electrical fire.
Code Violation – The NEC (National Electrical Code) requires all splices to be made inside an approved junction box with a cover. This protects the connection and ensures safety and accessibility for future maintenance.
Oxidation & Corrosion – Exposed copper or aluminum conductors are prone to oxidation, which increases resistance and can lead to overheating or failure of the connection.
Mechanical Weakness – A proper splice is secured with wire nuts, crimps, or other approved connectors. An open splice can easily come apart due to vibration, movement, or environmental conditions, leading to circuit failure or intermittent issues.