TECHNICAL NOTE - TOPIC JMTHY JMS-F: Alternative Mounting Method

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TECHNICAL NOTE

TOPIC

JMTHY JMS-F: Alternative Mounting Method

PURPOSE

This notice provides instructions for mounting the JMS-F SunSpec Rapid Shutdown Device when the

standard method of attaching the device’s mounting bracket to a solar PV module using a bolt hole

provided in the solar PV module frame is not possible.

APPLICABLE PRODUCTS

JMS-F SUNSPEC RAPID SHUTDOWN DEVICE

Type designation: JMS-F

SMA Part Number: 119814-00.01

BACKGROUND

The JMS-F SunSpec Rapid Shutdown Device is designed to mount directly to a solar PV module frame.

The standard method for mounting uses a M4 bolt which passes through a bolt hole provided in the

solar PV module frame. The standard mounting method is described in the installation manual which

is available for download on the SMA America product website: https://www.sma-america.com/

products/sunspec-certied-rapid-shutdown-technology/jms-f-sunspec-rapid-shutdown-device.html

Alternative Mounting Instructions

In the event that mounting the JMS-F SunSpec Rapid Shutdown Device to the solar PV module frame

is not possible according to the standard bolt hole attachment method described in the installation

manual, it is allowed to mount the JMS-F device to the ange of the solar PV module frame using

the alternative technique described below. In order to securely mount the JMS-F device without the

possibility of damaging the devices or the solar PV modules, the following equipment is needed:

» (1) JMS-F SunSpec Rapid Shutdown Device

» (1) M4-0.7 x 10 mm Stainless Steel Machine Screw

» A driver capable of being adjusted to a torque setting of between

2.0 – 2.5 Nm (17.7 – 22.1 in.lb) of force

Summary of content (4 pages)

PAGE 1
TECHNICAL NOTE TOPIC JMTHY JMS-F: Alternative Mounting Method PURPOSE This notice provides instructions for mounting the JMS-F SunSpec Rapid Shutdown Device when the standard method of attaching the device’s mounting bracket to a solar PV module using a bolt hole provided in the solar PV module frame is not possible. APPLICABLE PRODUCTS JMS-F SUNSPEC RAPID SHUTDOWN DEVICE Type designation: JMS-F SMA Part Number: 119814-00.
PAGE 2
Device Placement If mounting to a bolt hole in the solar PV module frame is not possible, please choose a placement for the JMS-F device on the solar PV module frame which avoids interfering with the solar PV mounting system. Do not mount the JMS-F device in such way that the drain holes of solar PV modules are blocked. Please also ensure that there is a minimum clearance of at least 38mm (1.5 inches) between the solar PV module and the roof surface.
PAGE 3
STATEMENT REGARDING GROUNDING The grounding/bonding evaluation for the JMS-F was completed as part of the UL1741 certification. The metal arms on the mounting bracket contain “teeth” which cut into the anodization layer of the solar PV module frame when a compression force is applied using the alternative mounting instructions described above. These “teeth” create the grounding bond between the JMS-F device and the solar PV module frame according to NEC Article 690.43.
PAGE 4
PHOTO APPENDIX FIGURE 2 Correctly mounted JMS-F according to the instructions provided in this technical note Correctly mounted JMS-F showing grounding “teeth” correctly engaging solar PV module frame SMA America, LLC +1 916 625 0870 Service@SMA-America.