What is the difference between the color code and glass bulb color code in table 188.8.131.52.1 in NFPA13?
Not sure which edition you are looking at, but more than likely the answer is temperature.
Look under operation:::
NFPA 13R. The chart has two different color systems described in it. with little or no explanation as to what they mean. First is Color Code i.e. 375f is the max ceiling temperature = Green // but the glass bulb temperature is black.
A manufacturers version of this chart caused us to apply a green bulb believing the rating was much higher than it is. There was no indication that the chart was abbreviated. I have tried to cut and paste the chart to show the issue. The two color codes per line don't seem to have a relationship. Why not require the glass bulb colors to match the "color code"?
I want to say the column marked "color code" refers to the "frame" color, which I do not think is used anymore.
184.108.40.206.3 Color identification shall not be required for ornamental sprinklers such as factory-plated or factory-painted sprinklers or for recessed, flush, or concealed sprinklers. 220.127.116.11.4 The frame arms of bulb-type sprinklers shall not be required to be color coded.
See bottom of page 2:::
Once ceiling temperature is asked or mentioned you must add 50 degrees to get the proper rating on the sprinkler head. If you are in a work scenario and are unsure you can hang thermometers in various locations to achieve the average ceiling temperature in the area of concern. You can do this process over a few days but you must record the different temperatures to get an average ceiling temperature. Hope this helps.
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