0000056377 00000 n
0000011525 00000 n
(3) The alternating-current output conductors from the inverter and an additional alternating-current disconnecting means for the inverter shall comply with 690.14(C)(1).
A photovoltaic disconnecting means shall not be required at the photovoltaic module or array location. A splice or joint is not allowed in the common grounding electrode conductor [250.47(B)]. PV systems with ground-fault protection that incorporates the system grounding connection must not have an additional grounding connection [690.42 Ex]. The Section 690.12 update to the 2017 National Electrical Code (NEC) calls for module-level rapid shutdown of solar systems instead of NEC 2014’s array-level shutdown requirement. The sum of ISC gives: 20 × 7.92 A = 158.4 A. Using disconnects with pull-out fuses is one method to disconnect a fuse from all sources of energy.
0000057314 00000 n
Any cost effective ideas?who shuts it down?
De-energizing the array and grid is one thing, but if the battery is still active, most of the house could still be energized.Battery systems (BESS) are often required by AHJs to have readily accessible DC disconnecting means and appropriate labeling within visible line of sight of the battery cabinets or enclosures. SMA is one of those inverter companies.
The disconnect must be: 1.
These disconnects must disconnect equipment from all ungrounded conductors of all sources. 0000021572 00000 n
(C) Initiation Device.
Non-load-break rated disconnects must be marked “Do not open under load.”
There has to be a way for a system with battery backup power to differentiate between loss of AC power due to a power outage, in which case the system must remain energized to provide standby power to the facility, vs. loss of power due to a fire event and AC power disconnection by the fire department. 0000021067 00000 n
0000010354 00000 n
The grounding connection can be at any single point on the grounded conductor of the PV DC output circuit [690.42]. It must indicate the location of the standalone PV system disconnect and that the structure contains a standalone electrical power system [690.56(A)].
If you run DC input PV system conductors and AC inverter output conductors inside a building or structure, run them in metal raceway, Type MC cable, or metal enclosure [690.31(E)]. 480 [690.71(A)]. Metallic mounting racks used as an EGC must be identified as an EGC or have identified bonding jumpers/devices connected between the separate metallic racks and be connected to an EGC as required by 690.43(A). Due to the Rapid shutdown having to be built into the system… and that there was no UL approved way of doing outside the inverter. PV Array PV Array. The production of power from solar resources is not a new concept, but it is an area of ever-changing technology and strong growth. Remember, PV modules are energized whenever the module is exposed to light, including moonlight. For interactive systems, the point of interconnection of the PV system power source to other sources must be marked at an accessible location at the disconnect as a power source and with the rated AC output current and nominal operating AC voltage [690.54]. The device “off” position shall indicate that the rapid shutdown function has been initiated for all PV systems connected to that device. What are the RSS requirements for batteries in a PV system? Shutting off the main breaker places the utility voltage and frequency out of range.”Microinverters ship rapid-shutdown-compliant and no additional components are needed. 0000026920 00000 n
0000057229 00000 n
A disconnect for PV systems — direct current (DC) and alternating current (AC) — must be a manually operable switch or circuit breaker complying with all of the following (
For one-family and two-family dwellings, an initiation device(s) shall be located at a readily accessible location OUTSIDE, (my emphasis), the building. Starting Jan. 1, 2019 when NEC 2017 goes into effect in Smart modules, microinverters and other module-level power electronics (MLPEs) assist solar systems with module-level rapid shutdown. The rapid shutdown initiation device(s) shall consist of at least one of the following:I wish a bit more attention had been given to this aspect of meeting the requirements. Greenbook Disconnect Switch Requirements for Distributed Generation Customers 060559 Page 2 of 6 Rev.
“Put another way, the UL 1741 inverter compliance requires that inverters cease operation whenever the utility parameters fall out range. Ground- 0000022810 00000 n
Not required unless the carport could somehow be considered to be “building integrated”, like on a parking structure for example. For interactive systems, use only inverters and AC PV modules listed as interactive [690.60]. The sum of ISC parallel-connected strings determines the current-capability requirements for the switch.
0000018288 00000 n
Single-conductor Type USE-2 or listed and labeled PV wire can be run exposed at outdoor locations for PV source circuits.