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101 renewable - solar labeling systems nec code compliant

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Last Updated
7th of January, 2020

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Labels for the solar industry are compulsory based on NEC 110 – 3 (A) respective NEC 90.3 and NFPA requirements(as NEC safety labels category). They have to withstand weather, they have to be placed visible and they have to mark the main installation components on the DC side and on the AC side. Special requirements are: they have to be UV protected and the ink has to be waterproof. When using labels in photovoltaic projects we have to know how much we label. The requirements can be checked with the local utility and we have to match all the extra requirements of the local fire department.

What we have to label is of most importance. Generally, we label both sections of our installation on the DC side as well on the AC site. On DC site we have to label the connectors along the rails where PV panels are mounted. One of the label type used with MC connectors is looking like in the picture below:

Do Not Disconnect

Another type of label is used to identify the string or array main I-V characteristics and respective peak power values in accord with NEC regulations. Such labels are more likely to be attached to string respective array combiner box and they have to be placed very visibly.

Max Power

Together with this type of label in order to identify the cable polarity, we can use labels to make sure which is the right polarity of that cable.

+/-

On DC site we have to rate the charge controllers if any, and we will use a very similar label as in the picture below:

Rated Current

The conduit used for home runs to DC disconnect has to be labeled with a label similar to:

Warning

Very important! Based on NFPA requirements a big visible label has to a specific indication that this is the main disconnect for the solar panel installation on the DC site.

DC Disconnect

There are some solar PV  installations with more as a single disconnect depending on the array size. NEC code may require having for each array a DC  disconnect additional to the main DC  disconnect.

All the DC disconnects are to be labeled and the type of labels is very similar to:

Solar Disconnect

We have to label the inverter on DC site with a label specifying the system inverter rating values:

Inverter Label

On the AC Site, we label the distribution board specifying that we run a double source and we clearly mark the breaker where the inverters are recorded.

Dual Power

You can download the " Typical Solar Installation with Labels" at the bottom of this page under Attachments.

Label Sys The Label System
How to use pv labels schematic


About the author of this article:
View Michael Comsa's profile on LinkedIn

Visitor Comments
  1. Comment #1 (Posted by Mauve )
    This is so cool thank you.
  2. Comment #2 (Posted by Aneisha )
    A few years ago I'd have to pay someone for this inofrmtaoin.
  3. Comment #3 (Posted by Gregorio Loya )
    This is an excellent article about NEC compliant Labels for PV solar. It can be used as a model for just about anybody including PV designer / installers. Thank you.
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