Advantages

• No External power required
• Easy to install
• Minimum of cathodic interference
• Anodes can be readily added
• Minimum of maintenance
• Uniform Distribution of current
• Installation can be economical.
• Minimum right-of-way

Limitations

• Limited driving potential
• Lower/Limited current output
• Poorly-coated structures require many anodes
• Can be ineffective in high resistivity environments.