Protection solutions for solar arrays

Grounded PV arrays

Solve the blind spot issue

Using a fuse on grounded solar arrays for ground-fault protection can create the "blind spot" issue - a ground fault on the already grounded conductor of a PV array may not drive sufficient current to trip the fuse. Additional faults can go undetected and may cause unexpected behavior, leading to a high risk of fire.

Bender's ground-fault relays detect low-level AC and DC ground faults on grounded arrays by using a differential measurement method, mitigating the blind spot issue. Advanced technology alerts technicians to conditions that may lead to damage to equipment or fire.

Brochure - Solar industry solutions
Brochure - Product overview

Ground-fault protection installed at the inverter:

Ground-fault protection installed at the combiner box:

NEC (2017 edition) 690.41
NEC (2014 edition) 690.5
CSA C22.1 Part 1 (CE Code) 64-064
UL 1741
Standard for Inverters, Converters, Controllers and Interconnection System Equipment

Ungrounded PV arrays

Trend ground faults as they develop

NEC 690.41 (2017 edition), NEC 690.35 (2014 edition), and CSA C22.1 (CE Code) 64-068 require ground fault protection on ungrounded solar arrays. By measuring the system's insulation resistance to ground, Bender's advanced ground-fault detectors provide accurate readings of immediate ground faults, as well as faults caused by slow deterioration over time.

Bender offers a wide range of ground-fault detectors for virtually all size arrays, from small-scale deployments to large-scale, utility grade solar grids.

Brochure - Solar industry solutions
Brochure - Product overview

Ungrounded arrays less than 1 MW:

Ungrounded arrays 1 MW or greater:

Ground-fault location for ungrounded PV arrays:

NEC (2017 edition) 690.41
NEC (2014 edition) 690.35
CSA C22.1 Part 1 (CE Code) 64-068