Grounding a PLFA Conduit in a Class 1 Div1 Location
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250.86 OtherConductor Enclosures and Raceways. Except
as permitted by 250.112(I), metalenclosures and raceways
for other than service conductorsshall be connected
to the equipment groundingconductor.
Exception No. 1:Metal enclosures and raceways for conductors
added toexisting installations of open wire, knoband-
tube wiring, andnonmetallic-sheathed cable shall not
be required tobe connected to the equipment grounding
conductor wherethese enclosures or wiring methods comply
with (1) through(4) as follows:
(1) Do notprovide an equipment ground
(2) Are in runsof less than 7.5 m (25 ft)
(3) Are freefrom probable contact with ground, grounded
metal, metallath, or other conductive material
(4) Are guardedagainst contact by persons
Exception No. 2:Short sections of metal enclosures or
raceways used toprovide support or protection of cable
assemblies fromphysical damage shall not be required to
be connected tothe equipment grounding conductor.
Exception No. 3:A metal elbow shall not be required to be
connected to theequipment grounding conductor where it
is installed ina run of nonmetallic raceway and is isolated
from possiblecontact by a minimum cover of 450 mm
(18 in.) to anypart of the elbow or is encased in not less
than 50 mm (2 in.) ofconcrete.
as permitted by 250.112(I), metalenclosures and raceways
for other than service conductorsshall be connected
to the equipment groundingconductor.
Exception No. 1:Metal enclosures and raceways for conductors
added toexisting installations of open wire, knoband-
tube wiring, andnonmetallic-sheathed cable shall not
be required tobe connected to the equipment grounding
conductor wherethese enclosures or wiring methods comply
with (1) through(4) as follows:
(1) Do notprovide an equipment ground
(2) Are in runsof less than 7.5 m (25 ft)
(3) Are freefrom probable contact with ground, grounded
metal, metallath, or other conductive material
(4) Are guardedagainst contact by persons
Exception No. 2:Short sections of metal enclosures or
raceways used toprovide support or protection of cable
assemblies fromphysical damage shall not be required to
be connected tothe equipment grounding conductor.
Exception No. 3:A metal elbow shall not be required to be
connected to theequipment grounding conductor where it
is installed ina run of nonmetallic raceway and is isolated
from possiblecontact by a minimum cover of 450 mm
(18 in.) to anypart of the elbow or is encased in not less
than 50 mm (2 in.) ofconcrete.
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