What is an Arc Blast?
An Arc Blast is a dangerous condition associated with the explosive
release of energy caused by an electrical arc due to either a phase to
ground or phase to phase fault. Arc Blast can result from many factors,
including dropped tools, accidental contact with electrical systems,
build up of conductive dust, corrosion, and improper work procedures.
Why do I need to do an Arc Blast Hazard Analysis?
Per NFPA 70E-2004, Part II 2-1.3.3 Arc Blast Hazard Analysis states that
a "Flash hazard analysis shall be done before a person approaches any
exposed electrical conductor or circuit part that has not been placed in
an electrically safe work condition." These Arc Blast Hazard Analysis
calculations must be performed to determine the appropriate PPE required
for personnel working near any exposed electrical conductor or circuit
part. In order to determine the appropriate level of PPE required, the
available fault current at the energized electrical equipment being
serviced must be known for Arc Blast analysis.
NFPA 70E requires the following elements:
Hazard Analysis on All Electrical Exposure Areas
Determination based on potential energy exposure levels (cal/cm2)
each electrical source for its specific Arc Blast Hazard
the Arc Blast Hazard Areas
All Authorized Employees for Arc Blast
Other items as
VIDEO- David Wallis
(Federal OSHA) Comments on 70E Enforcement
(Click link to view video.)
Contact The Hilgeman Group for assistance
with your Arc Blast Safety Program.