Which of the following is an ESD precaution according to Apple standards?

Question

Options

• ASafety apron made of synthetic fibers should be worn.
• BThe relative humidity in a work area should be lower than 50 percent.
• CAn ionized air generator can be used instead of grounding a work area.
• DA person working on an ESD-sensitive circuit should not be touched.

• A
  3% (1)
• B
  7% (2)
• D
  90% (27)

Explanation

Option D is correct because touching a technician who is grounded and working on ESD-sensitive components can transfer static charge from the person making contact, through the technician, and into the circuit - disrupting the entire protection chain. Apple's ESD guidelines emphasize that no one should contact a person while they are handling sensitive components.

Why the distractors are wrong:

• A is backwards - synthetic fibers (polyester, nylon) are major sources of static generation; ESD-safe garments use natural or dissipative materials, not synthetics.
• B is backwards - low humidity increases static buildup; standards recommend keeping humidity at or above 50% to help dissipate charge.
• C is a dangerous half-truth - ionized air generators supplement grounding for items that can't be grounded, but they never replace proper grounding of the work area and personnel.

Memory tip: Think of the technician as a grounded wire - if you grab a grounded wire while it's connected to a circuit, you become part of that circuit. Same principle: "don't break the chain" by touching the tech.

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