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UL 474 Standard for Dehumidifiers Updated

Dehumidifier photo

UL has released a new edition of UL 474, the standard for dehumidifiers. The 10th edition was issued to editorially remove a statement from thetransmittal page. No changes were made to the body of the standard.The new edition can be purchased on the UL website.

Description*

- Partner Content -

Mastering High Voltage: The Importance of Accurate Test Equipment

This whitepaper underscores that precise calibration of high-voltage test gear — especially when measuring 1 kV–150 kV systems — is essential for safety, reliability, and regulatory compliance. It details measurement techniques (voltage dividers, step-down transformers, etc.), the impact of environmental and connection factors on accuracy, and why traceable calibration (e.g. to NIST / A2LA) is a must to ensure consistent, reliable results.

“These requirements cover movable, household, self-contained dehumidifiers employing hermetic refrigerant motor-compressors and intended for connection to single-phase, alternating-current (ac) circuits rated not more than 20 amperes, 125 volts or 15 amperes, 208 or 230 volts. The requirements also cover dehumidifiers which incorporate electric air heaters.”

*Description from the UL website.

Photo by jcasimir

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