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SESK: Stuff Everyone Should Know · sesk.info/ham-current-body-hazards

Which effects can electrical current have on the body?

It can cause heating, cell disruption, and involuntary muscle contractions.

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  1. Only temporary radio interference
  2. Heating, cell disruption, and muscle contractions ✔
  3. Only a harmless tingling sensation

Why: Current through the body can heat tissue, disturb cells' electrical functions, and contract muscles without control. Electrical work requires protection from all of these hazards.

Huh, didn't know that: The path current takes through the body affects the risk.

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References

Answer: Heating, cell disruption, and muscle contractions. Current through the body can heat tissue, disturb cells' electrical functions, and contract muscles without control. Electrical work requires protection from all of these hazards.

  1. NCVEC 2026-2030 Technician Question Pool (Feb 19, 2026 errata) ncvec.org/downloads/2026-2030%20Technician%20Pool%20and%20Syllabus%20Public%20Release%20Feb%2019%202026.pdf
    A. It may cause injury by heating body tissue
    Checked 2026-10-09.
  2. NCVEC 2026-2030 Technician Question Pool (Feb 19, 2026 errata) ncvec.org/downloads/2026-2030%20Technician%20Pool%20and%20Syllabus%20Public%20Release%20Feb%2019%202026.pdf
    B. It may disrupt the electrical functions of cells
    Checked 2026-10-09.
  3. NCVEC 2026-2030 Technician Question Pool (Feb 19, 2026 errata) ncvec.org/downloads/2026-2030%20Technician%20Pool%20and%20Syllabus%20Public%20Release%20Feb%2019%202026.pdf
    C. It may cause involuntary muscle contractions
    Checked 2026-10-09.

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