RadonReporter-Autumn 2019

6 The radon reporter / Autumn 2019 The Code also defines a Class 3 circuit as that portion of the wiring system between the load side of a Class 3 power source and the connected equipment. Since the Class 3 circuit has higher levels of voltage than for Class 2 circuits, it specifies additional safeguards to provide protection from an electric shock you might encounter on the job site. Many jurisdictions do not require an electrical permit or a licensed installer for Class 2 or Class 3 devices such as the example shown on page 4, from the State of North Carolina. Can you install a Low Voltage radon fan without a permit? Make sure the radon fan is a Listed Class 2 or Class 3 device and check with your local code official. Other Low Voltage fans not meeting the shock and overcurrent protection may need to be installed by a licensed electrician. Again, check with your local code official. Devices &QA By Rebecca Turek, Manager, Radon Reference Laboratory, Bowser- Morner, Inc. In “Understanding Radon Testing Quality Assurance” at this year’s symposium in Denver, we discussed critical components of measurement devices and how to ensure that as measurement professionals, course participants were well equipped to be able to provide the highest quality results to their clients. It is important to recognize that the requirements for each type of device vary as they all work differently and have differing strengths and weaknesses. Calibrations are required annually for all continuous radon monitors that are approved professional devices. As a measurement professional, your responsibility is to send the unit to either a secondary or tertiary chamber, noting that the chamber that calibrates your unit should be approved to do so by the unit’s manufacturer. You may be required to do a device performance test, which would also require an approved/accredited chamber. I always recommend completing a performance test with a unit that has recently been calibrated and thus is at its most accurate. A common cause of device performance test failures is that the unit has not been recently calibrated. Also important to quality assurance for continuous radon monitors are cross-checks and duplicates. These are great ways to confirm and document that your unit(s) are working as they should be throughout the rest of the year following calibration. Additionally, they can help detect problems that may have occurred during return shipping. If you only have Technology continued from page 4