Exposed Electrical Work

RedSafety

New User
Location
San Jose
Occupation
Safety Coordinator
Replacing a breaker in a 480v 3phase panel that is part of a distribution cabinet. It is also a wireway for DLO cables that pass through the lower portion of cabinet to an adjacent meter section. The panel will be de-energized according to MOP. The DLO cables will continue to be energized during the replacement of breaker. The DLO cables do not have to be manipulated in any manner in order to replace the breaker. Does NFPA 70e still consider this working in an electrically energized situation? Please give reference.
 

EC Dan

Senior Member
Location
Florida
Occupation
E&C Manager
The applicable section is 130.2 and defines two conditions for needing to establish an electrically safe work condition for systems above 50 V:

1. Working within limited approach boundary. Only applies to exposed electrical parts, so the pass-through conductors are excluded.
2. Interacting with equipment where conductors or circuit parts are not exposed but an increased likelihood of arc flash hazard exists. Since the conductors pass through the enclosure and are not being manipulated, the risk of arc flash is minimal.
 

petersonra

Senior Member
Location
Northern illinois
Occupation
engineer
The applicable section is 130.2 and defines two conditions for needing to establish an electrically safe work condition for systems above 50 V:

1. Working within limited approach boundary. Only applies to exposed electrical parts, so the pass-through conductors are excluded.
2. Interacting with equipment where conductors or circuit parts are not exposed but an increased likelihood of arc flash hazard exists. Since the conductors pass through the enclosure and are not being manipulated, the risk of arc flash is minimal.
what happens if he drops a tool on the DLO conductors while removing the breaker?
 
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