When evaluating a site with multiple transmitters operating at the same time, the operators and licensees of which transmitters are responsible for mitigating over-exposure situations?

Deep Dive: E0A04

The correct answer is C: Each transmitter that produces 5 percent or more of its MPE limit in areas where the total MPE limit is exceeded. At a multiple-transmitter site, responsibility for mitigation applies to each operator and licensee whose transmitter contributes at least 5 percent of its own maximum permissible exposure limit in an area where the combined exposure exceeds the limit.

Why Other Answers Are Wrong

Option A: The current rule uses a 5 percent contribution threshold, not 20 percent. Option B: Duty cycle is part of an exposure evaluation, but a duty cycle above 25 percent is not the rule for assigning mitigation responsibility. Option D: A duty cycle above 50 percent is not the responsibility threshold.

Exam Tip

For shared RF sites, remember the mitigation threshold is 5 percent of a transmitter's MPE limit where the combined limit is exceeded.

Memory Aid

Shared site responsibility starts at five percent.

Source & Coverage

Question Pool: 2024-2028 Question Pool

Subelement: E0A

Reference: 2024-2028 Question Pool · E0 - Safety

Key Concepts

multiple-transmitter sites maximum permissible exposure 5 percent threshold

Official Pool Source

Question text and answer key are synchronized with the current NCVEC Extra Class pool and mapped to the E0A topic.