CSLB C-46 Solar ContractorElectrical and Plumbing CodesMedium
A solar contractor is commissioning a new grid-tied PV system with a central inverter. The utility requires a readily accessible, lockable, and clearly labeled disconnecting means for the PV system. According to NEC Article 690.17, what is the maximum number of movements or operations required to actuate all PV disconnecting means for a PV system?
- ANo limit, provided they are all labeled
- BSix
- COne
- DTwo
Show answer & explanationAnswer & explanation
Correct answer: B. Six
NEC Article 690.17 states that the PV system disconnecting means shall consist of not more than six switches or six circuit breakers mounted in a single enclosure, in a group of separate enclosures, or in or on a switchboard or panelboard. This allows for quick and efficient de-energization.
Why the other options are wrong
- A. There is a clear limit of six operations set by the NEC.
- C. One movement is ideal but not the maximum allowed by NEC for all disconnecting means.
- D. Two movements is less than the maximum allowed by NEC.
PV Disconnect Actuations
NEC 690.17 limits PV system disconnecting means to a maximum of six movements or operations to de-energize the system.
- Ensures quick shutdown for safety.
- Applies to both AC and DC disconnects.
- Can be individual switches or breakers in a group.
Memory trick: Disconnect in Six or Less, for Safety's Success.