Approach Boundaries NFPA 70E 2015 Update

NFPA 70E 2015 130.4 Approach Boundaries to Energized Electrical Conductors or Circuit Parts for Shock Protection.

NFPA 70E 2015 Approach Boundaries Tables

NFPA 70E 2015 Approach Boundaries Table 130.4(D)(a) – Free Download

(A) Shock Risk Assessment. A shock risk assessment shall determine the voltage to which personnel will be exposed, the boundary requirement, and the PPE necessary in order to minimize the possibility of electric shock to personnel.

(B) Shock Protection Boundaries. The shock protection boundaries identified as limited approach boundary and restricted approach boundary shall be applicable where approaching personnel are exposed to energized electrical conductors or circuit parts. Table 130.4(D)(a) shall be used for the distances associated with various ac systems voltages. Table 130.4(D)(a) shall be used for the distances associated with various dc system voltages.

(C) Limited Approach Boundary.

(1) Approach by Unqualified Persons. Unless permitted by 130.4(C)(3), no unqualified person shall be permitted to approach nearer than the limited approach boundary of energized conductors or circuit parts.

(2) Working at or Close to the Limited Approach Boundary. Where one or more unqualified persons are working at or close to the limited approach boundary, the designated person in charge of the work space where the electrical hazard exists shall advise the unqualified person(s) of the electrical hazard and warn him or her to stay outside the limited approach boundary.

Arc Flash Approach Boundaries NFPA 70E

NFPA 70E 2015 Approach Boundaries Table 130.4(D)(b) – Free Download

(3) Entering the Limited Approach Boundary. Where there is a need for an unqualified person(s) to cross the limited approach boundary, a qualified person shall advise him or her of the possible hazards and continuously escort the unqualified person(s) while inside the Limited Approach Boundary. Under no circumstance shall the escorted unqualified person(s) be permitted to cross the Restricted Approach Boundary.

(D) Restricted Approach Boundary. No qualified person shall approach or take any conductive object closer exposed energized electrical conductors or circuit parts operating at 50 volts or more than the restricted approach boundary set forth in Table 130.4(D)(a) and Table 130.4(D)(b), unless one of the following conditions applies:

(1) The qualified person is insulated or guarded from the energized electrical conductors or circuit parts operating at 50 volts or more. Insulating gloves or insulating gloves and sleeves are considered insulation only with regard to the energized parts upon which work is being performed. If there is a need for an uninsulated part of the qualified persons body to contact exposed energized electrical conductors or circuit parts, a combination of
130.4(D)(1), 130.4(D)(2), and 130.4(D)(3), shall be used to protect the uninsulated body parts.

(2) The energized electrical conductors or circuit part operating at 50 volts or more are insulated from the qualified person and from any other conductive object at a different potential.

(3) The qualified person is insulated from any other conductive object.