This past week I had three different contractors who were surprised when I asked them about the LABEL they were supposed to install on the Service Equipment per this section. So I felt this needed to be addressed again to help you pass your inspections. This section is pretty plain and states “Service equipment installed in other than a dwelling unit shall be field marked with the maximum available fault current”. The field markings shall include the DATE the calculation was performed and that the LABEL shall be of sufficient durability to withstand the environment involved. A sharpie is not going to cut it because although it says permanent it is not. Some form of a label shall be made to withstand the sun and salt environment we have down here in South Florida.
So after my inspections this week, I have three jobs all waiting for labels to be placed on the service equipment before I can final out their permits. It was noted on the plans for these jobs that I was expecting this to be done because it is a NEW code change and I am required by the Code to enforce these new requirements.
In Lake Worth it will not be a problem to get the Fault Current of the transformer because I have them and can supply them with the plan review or at the inspection. All I need is the size, and secondary voltage of the transformer to be able to supply this information. The information I give out is the FAULT CURRENT at the terminals of the transformer and not at the service equipment.
There are several fault current calculators out there on the WEB to be found for free as an ap or download that will help you to calculate the AIC at the service equipment.
So when the inspectors looks for the LABEL it should already be there.
Till next week be safe
Jake