Pv Rapid Shutdown Equipment (Pvrse); Anti-Islanding Methodology - enphase IQ8MC Installation And Operation Manual

PV rapid shutdown equipment
This product is UL-Listed as PV rapid shutdown equipment
2020, and NEC-2023 section 690.12, and C22.1-2018 Rule 64-218 rapid shutdown of PV systems for AC and DC
conductors, when installed according to the following requirements:
•
Microinverters and all DC connections must be installed inside the array boundary. Enphase further
requires installing microinverters and DC connections under the PV module to avoid direct exposure to
rain, UV, and other harmful weather events.
•
The array boundary is defined as 305 mm (1 ft.) from the array in all directions or 1 m (3 ft.) from the point
of entry inside a building.
This rapid shutdown system must be provided with an initiating device or status indicator installed in a location
accessible to first responders. Alternatively, it must be connected to an automatic system that initiates rapid
shutdown if a system gets disconnected or an emergency system is activated.
The initiator shall be listed and identified as a disconnecting means that indicates whether it is in the OFF or ON position.
When installed with IQ System Controller, the PV system is disconnected using rapid shutdown (RSD).The Enphase
System Shutdown switch provides the functionality of rapid shutdown as mandated by NEC when it is used with IQ
System Controller 2, which has IQ8 Series Microinverters connected to it. For more information on rapid shutdown,
refer to the rapid shutdown FAQ https://community.enphase.com/s/article/Rapid-Shutdown-FAQs.
In a grid-tied PV-only system, the PV system is disconnected using a readily accessible switch or circuit breaker.
The handle position of a switch or circuit breaker can be used as an indicator. Refer to NEC or CSA C22.1-
2018 for more information.
Additionally, in a prominent location near the initiator device, a placard or label must be provided with a
permanent marking including the following wording:
'PHOTOVOLTAIC SYSTEM EQUIPPED WITH RAPID SHUTDOWN' The term 'PHOTOVOLTAIC' may be replaced with 'PV.'
The placard, label, or directory shall be reflective, with all letters capitalized and having a minimum height of 9.5 mm
(3/8 in) in white on a red background.

Anti-islanding methodology

The anti-islanding methodology used by Enphase IQ8 Series Microinverters is listed by UL and tested in accordance with
IEEE1547-2018 and UL1741-SB.
IQ8 Series Microinverter uses the Group 1 method of anti-islanding
defined in Sand2018-8431, July
Group 1: Frequency shift with continuous positive frequency feedback
Group 2A: Frequency shift with discontinuous or stepped positive frequency feedback
Group 2B: Frequency shift similar to Group 2A except with a dead zone around 60 Hz
Group 2C: Frequency shift with unidirectional frequency feedback
Group 3: Monitors change of impedance
Group 4: Monitors shift at a harmonic frequency (multiple of the fundamental)
Group 5: Passive methods such as rate of change of frequency and vector shift
Group 6: Produces negative sequence current and monitors the voltage
For any questions, contact
9
IQ8MC/IQ8AC/IQ8HC Microinverters Installation and Operation Manual
2018:
Enphase Support.
© 2023 Enphase Energy Inc. All rights reserved.
(PVRSE)
and conforms with NEC-2014, NEC-2017, NEC-
based on the definitions provided in the list below as
October 2023
USM-00008-1.0