By Todd Fries, Identification Product Manager at Hellermann Tyton
As adhesive labels replace plastic engraved plates, PV labeling has become a high interest subject and important consideration within the PV industry. In the past, there has been no universal consensus on the definition of acceptable photovoltaic infrastructure labeling, which has resulted in inconsistent compliance information. But the road to standardization is being paved with new codes and standards such as requirements outlined in the National Electrical Code (NEC 2011) and International Fire Code (IFC 2012).
Both the NEC and IFC are directing the code requirements for labeling. Section 690 of the NEC code outlines the basic parameters for labeling. The IFC goes a step further by actually defining the size of text, color and physical properties of the label making it possible to now start the process of label standardization. The IFC is concerned about first responders being able to identify and isolate the solar circuits so they have mandated that certain labels be red, reflective and use character heights that are visible from a distance. There is now some synergy between the two requirements that breaks new ground in better defining PV labeling requirements for the installer, designer and inspector.
Having to re-schedule or delay an inspection due to PV labeling issues can be inconvenient and costly. Considerations when preparing to label an installation include:
1. Is the marker reflective? Is reflectivity required?
2. Does the marker meet UL969 requirements?
3. Can the marker easily adhere to conduit?
4. Is the marker UV resistant?
5. Will the marker stick to a variety of surfaces for
the life of the product?
6. Is the printed verbiage correct?
7. Are the printed characters at least
3/8” tall, where required?
8. Are the colors correct?
The updated standards open the door for the acceptable use of high-quality labeling products designed to meet the critical UV exposures and provide a permanent marking on low energy surfaces—such as powder coat paints found on many of the new breaker boxes and inverters.
This comes at an opportune time when the market is capable of supplying label inks and adhesives that are UV stable and have the ability to adhere to various surfaces without losing adhesion due to temperature or environmental changes.
It also provides a cost advantage to the installer. If a high-quality, UV stabilized, pre-printed or semi pre-printed label is used, the cost of labeling a typical installation decreases from $60 to $70 per installation to maybe $10 or $20 per installation.
The one caveat is the local regulations mandated by the Authority Having Jurisdiction (AHJ). Some communities mandate the use of an engraved plate. Yet, in most there is no specific definition of what type of marker must be used. This gives the installer more variability in selecting a PV labeling solution.
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