Suurjännitteinen

Suurjännitteinen is a Finnish term used in electrical engineering and safety contexts to describe equipment, installations, or systems designed to operate at high electrical voltages. The exact thresholds vary by standard and country, but it generally denotes voltages significantly higher than ordinary mains voltages, typically around or above one kilovolt for alternating current or higher for direct current.

In practice, suurjännitteinen appears in product specifications, maintenance manuals, and safety signage. Examples include suurjännitteinen laite or suurjännitteinen sähköverkko. The term is part of a broader voltage classification that also includes matalajännitteinen (low voltage) and keskijännitteinen (medium voltage). The boundaries between these categories are defined by standards such as IEC, EN, and national regulations.

Safety considerations for suurjännitteinen equipment emphasize adequate insulation, creepage and clearance distances, protective enclosures, proper grounding, and lockout procedures. Design, testing, operation, and labeling are governed by applicable standards and directives to reduce the risk of electric shock, arcing, and insulation failure. The term is formed from suur- (large/high) and jännite (voltage), with the Finnish suffix -nen to form an adjective meaning high-voltage or high-tension.