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Safety Limits for Touch Voltages Transferred in LV Installations

Safety Limits for Touch Voltages Transferred in LV Installations. HV safety limits applied in LV installations ?. GPR and touch voltages transferred in LV installations during a fault on the MV system.

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Safety Limits for Touch Voltages Transferred in LV Installations

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  1. Safety Limits for Touch Voltages Transferred in LV Installations HV safety limits applied in LV installations?

  2. GPR and touch voltages transferred in LV installations during a fault on the MV system

  3. Touch voltages measured in LV installations during a phase-to-neutral fault on overhead MV lines

  4. LV installations (C22.1-1998) Standards • Safety limits defined for touch voltages • Same limits for transferred voltages in LV installations • GPR and touch voltages neglected • phase-to-ground voltages < 150 V HV installations (IEC 61936, IEEE 80 Guide)

  5. Today Conclusions • More measurement data • Standards offering a better guidance regarding transferred voltages • HV installations designed to comply with safety limits • Transferred voltages in LV installations not investigated Tomorrow

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