NEC Annex G provides guidelines for the installation and maintenance of Supervisory Control and Data Acquisition (SCADA) systems, which are used for monitoring and controlling various operations, especially in critical infrastructure and industrial environments. Here is an overview of the key points in Annex G:
1. Purpose
Annex G aims to ensure that SCADA systems are installed and maintained to enhance the reliability and security of operations. These systems are critical for real-time data collection, monitoring, and control in various industries.
2. SCADA System Components
The annex outlines the essential components of SCADA systems, including:
- Remote Terminal Units (RTUs)
- Programmable Logic Controllers (PLCs)
- Human-Machine Interfaces (HMIs)
- Communication Infrastructure
3. Installation Guidelines
Details installation practices for SCADA components to ensure proper functionality and safety. This includes recommendations for:
- Wiring Methods: Ensuring the use of appropriate wiring techniques to prevent interference and signal degradation.
- Grounding and Bonding: Proper grounding of SCADA components to protect against electrical faults.
- Environmental Controls: Maintaining suitable environmental conditions to protect sensitive SCADA equipment.
4. Security Measures
Emphasizes the importance of securing SCADA systems against cyber threats and physical tampering. This includes implementing robust access controls, encryption, and regular security audits.
5. Maintenance and Testing
Outlines requirements for regular maintenance and testing of SCADA systems to ensure continuous and reliable operation. This includes routine inspections, functional tests, and updates to software and hardware components.
6. Documentation and Training
Requires comprehensive documentation of SCADA system design, installation, and maintenance procedures. Additionally, it mandates training for personnel on the operation and troubleshooting of SCADA systems to ensure effective management.
For more detailed information and specific guidelines, consulting the NEC Handbook and additional resources provided by the NFPA is highly recommended. Further insights can be found on NFPA’s official site and SunCam.