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NFPA 70e Restricted Approach Boundary Question

Question asked by david.gildersleeve on Jul 17, 2020

NFPA 70e Question: Note ‘a’ to Table 130.4(D)(a) directs the user to use a voltage level of the phase-to-ground voltage times 1.732 when determining the limited and restricted approach boundaries for single-phase systems above 250 volts. Paragraph C.2.1.1 in Informative Annex C of the 70e Handbook simply says to use the phase-to-ground voltage times 1.732 with no exclusion for voltages below 250V and Paragraph C.2.1.4 of the Handbook states that the restricted approach boundary for household 120/240V systems is “avoid contact”. Question for Clarification: Would the restricted approach boundary for 120/240V single-phase systems used in industrial facilities be the same as noted for household applications (avoid contact) or should we use 120 x 1.732 = 208V which would be one foot?

 

Thank you in advance,

David Gildersleeve

david.gildersleeve@fhr.com

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