IEC/SC 77C - High power transient phenomena
“Standardization in the field of electromagnetic compatibility to protect equipment, systems and installations from intense but infrequent high power transient phenomena including: the electromagnetic fields produced by nuclear detonations at high altitude (High Altitude Electromagnetic Pulse (HEMP)); sources of Intentional Electromagnetic Interference (EMI); and Geomagnetically Induced Currents (GIC) from solar activity. Lightning and other transient phenomena are excluded from the scope of SC 77C.”
Phénomènes transitoires de forte intensité
« Normalisation dans le domaine de la compatibilité électromagnétique pour protéger les appareils, systèmes et installations contre les effets peu fréquents des phénomènes transitoires de forte intensité y compris : les champs électromagnétiques produits par des explosions nucléaires à haute altitude (Impulsion Électromagnétique à haute altitude (HEMP)), les sources d’Interférences Électromagnétiques (EMI) intentionnelles, les Courants Induits Géomagnétiquement (GIC) dus à l’activité solaire. La foudre ainsi que les autres phénomènes transitoires sont exclus du domaine d’application du SC 77C. ».
General Information
Frequently Asked Questions
IEC/SC 77C is a Subcommittee within the International Organization for Standardization (ISO). It is named "High power transient phenomena" and is responsible for: “Standardization in the field of electromagnetic compatibility to protect equipment, systems and installations from intense but infrequent high power transient phenomena including: the electromagnetic fields produced by nuclear detonations at high altitude (High Altitude Electromagnetic Pulse (HEMP)); sources of Intentional Electromagnetic Interference (EMI); and Geomagnetically Induced Currents (GIC) from solar activity. Lightning and other transient phenomena are excluded from the scope of SC 77C.” This committee has published 9 standards.
IEC/SC 77C develops ISO standards in the area of Information technology. The scope of work includes: “Standardization in the field of electromagnetic compatibility to protect equipment, systems and installations from intense but infrequent high power transient phenomena including: the electromagnetic fields produced by nuclear detonations at high altitude (High Altitude Electromagnetic Pulse (HEMP)); sources of Intentional Electromagnetic Interference (EMI); and Geomagnetically Induced Currents (GIC) from solar activity. Lightning and other transient phenomena are excluded from the scope of SC 77C.” Currently, there are 9 published standards from this subcommittee.
The International Organization for Standardization (ISO) is an independent, non-governmental international organization that develops and publishes international standards. Founded in 1947 and headquartered in Geneva, Switzerland, ISO brings together experts from 170+ member countries to share knowledge and develop voluntary, consensus-based standards that support innovation and provide solutions to global challenges.
A Subcommittee (SC) in ISO operates under a Technical Committee and focuses on a specific subset of the TC's scope. Subcommittees develop standards and technical specifications in their specialized area, reporting to their parent Technical Committee. They may also have working groups for detailed technical work.