Pv Rapid Shutdown Equipment (Pvrse); Anti-Islanding Methodology - enphase IQ8X Installation And Operation Manual

PV rapid shutdown equipment (PVRSE)

This product is UL Listed as PV rapid shutdown equipment and conforms with NEC-2014, NEC-2017, NEC-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 have an initiating device or status indicator installed in a location accessible to first
responders. Alternately, it must be connected to an automatic system that initiates Rapid Shutdown in the event a
system disconnects or another emergency system is activated.
The initiator shall be listed and identified as a disconnecting means that plainly indicates whether it is in the "off" or "on"
position. Examples are the following:
When installed with IQ System Controller
•
PV system disconnecting means 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 an IQ8 Series Microinverters connected to it. For more information on rapid shutdown,
refer to the
In a grid-tied PV-only system:
•
Service disconnecting means
•
Readily accessible switch or circuit breaker
The handle position of a switch or circuit breaker is suitable for use 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 like rate of change of frequency, vector shift
Group 6: Produces negative sequence current and monitors the voltage
For any questions, please contact
8
IQ8MC, IQ8AC, IQ8HC, and IQ8X Microinverters Installation and Operation Manual
rapid shutdown FAQ.
2018:
Enphase Support
© 2023 Enphase Energy Inc. All rights reserved.
based on the definitions provided in the list below as
November 2023
USM-00008-2.0