RCDD Question #126: Real Exam Question with Answer & Explanation

The correct answer is D. Installation of isolated grounds. Isolated grounds reduce EMI/RFI noise on sensitive equipment grounds and are not an electrostatic discharge (ESD) control method.

Question

All of the following are used to control static discharge EXCEPT:

Options

AIon generator
BDischarge plates and bracelets
CMaintenance of humidity of between 30 and 55 percent
DInstallation of isolated grounds

Explanation

Isolated grounds reduce EMI/RFI noise on sensitive equipment grounds and are not an electrostatic discharge (ESD) control method.

Common mistakes.

A. Ion generators emit positive and negative ions that neutralize static charges on surfaces and in the air, making them a valid and widely used ESD control device.
B. Anti-static wrist bracelets and discharge plates safely bleed accumulated static charge from personnel and components to ground, directly addressing ESD.
C. Maintaining relative humidity between 30 and 55 percent reduces static charge accumulation by allowing charges to dissipate through moist air, a well-established ESD prevention practice.

Concept tested. ESD control methods vs. isolated ground purpose

Reference. https://www.esda.org/standards/esd-standards/

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