Quick Answer
Local codes require solar grounding and bonding to meet specific requirements, such as NEC Article 250, to ensure electrical safety. Grounding and bonding requirements vary by location, and installers must verify compliance with local regulations. Inadequate grounding can lead to electrical shock or system damage.
Understanding Local Codes for Solar Grounding
Solar installers must familiarize themselves with local electrical codes, particularly NEC Article 250, which governs grounding and bonding. The National Electric Code (NEC) is widely adopted in the United States, but jurisdictions may have unique requirements. Installers should consult the local electrical code authority having jurisdiction (AHJ) to ensure compliance.
Grounding and Bonding Requirements
Grounding and bonding requirements for solar systems involve connecting the system to the earth and to each other. The grounding electrode system consists of a grounding electrode, such as a grounding rod, and a grounding conductor, usually a 6 AWG copper wire. The bonding jumper connects the grounding system to the solar panel array’s ground point, typically at the inverter. A 4 AWG copper wire is commonly used for bonding. For systems larger than 240 volts, a 2 AWG or 1 AWG wire may be required.
Ensuring Compliance
To ensure compliance with local codes, installers should verify the following: (1) the grounding electrode system meets the required minimum size, (2) the grounding conductor and bonding jumper are sized correctly, and (3) all connections are secure and meet code requirements. Installers should also document their work and provide a certificate of compliance to the AHJ.
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