7.4 The ESD Protected Area (EPA)

Electrostatic Discharge (ESD) is the primary latent failure mechanism in modern electronics. Damage occurs at voltages below human perception (< 3000V). The ESD Protected Area (EPA) is a defined zone where all surfaces, people, and devices are kept at the same electrical potential (equipotential bonding).

7.44.1 EPA Boundaries & Signage

• Physical Demarcation: The EPA (must be clearly visible via yellow/black aisle tape or physical barriers.
• Signage: "Attention: ESD Protected Area)
  Area"
  • Boundaries:signs Howmust tobe visuallyposted markat whereall theentry "Safe Zone" begins (Yellow/Black tape, signage).points.
  • The Flooring"3-Foot System:Rule": SpecificationsStatic generating materials (regular plastic, Styrofoam cups, packing tape) are prohibited within 1 meter (3 feet) of any exposed PCBA.

  7.4.2 Entry Protocols

  • Mandatory Testing: No person (employee or visitor) may enter the EPA without passing a resistance test for ESD Tiles vs. Epoxies. Testing protocols (Walking Test).
  • Entry Protocols: The "Smock and Strap" rule. Testing stations at the entrance (logging footfootwear and wrist strapstraps.
  • Data resistanceLogging: daily)Test results must be logged electronically. Failure to pass restricts door access (Smart Gate system).

  Final Checklist

  Element	Requirement	Verification Frequency
  Boundaries	Visual Tape / Signage	Monthly Audit
  Prohibited Items	No Insulators < 30cm from ESDS	Daily Visual
  Access Control	Pass/Fail Gate Test	Daily (Every Entry)