Table 130.7(C)(15)(A)(b) Equipment Arc Flash PPE Category Arc Flash Boundary Panelboards or other equipment rated 240V and below 485 mm 1 Parameters: ...
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Table 130.7(C)(15)(A)(b) Arc-Flash Hazard PPE Categories for Alternating Current (ac) Systems Equipment Panelboards or other equipment rated 240V and below
Arc Flash PPE Category
Arc Flash Boundary 485 mm
1 Parameters: Maximum of 25 kA short-circuit current available; maximum of 0.03 sec (2 cycles) fault clearing time; working distance 455 mm (18 in.) Panelboards or other equipment rated >240V and up to 600V
(19 in.) 900 mm 2
Parameters: Maximum of 25 kA short-circuit current available; maximum 0.03 sec (2 cycles) fault clearing time; working distance 455 mm (18 in.) 600-V class motor control centers (MCCs) Parameters: Maximum of 65 kA short-circuit current available; maximum of 0.03 sec (2 cycles) fault clearing time; working distance 455 (18 in.) 600-V class motor control centers (MCCs)
(3ft.) 1.5m 2
(5 ft) 4.3 m
4 Parameters: Maximum of 42 kA short-circuit current available; maximum of 0.33 sec (20 cycles) fault clearing time; working distance 455 mm (18 in.) 600-V class switchgear (with power circuit breakers or fused switches) and 600 V class switchboards
(14 ft) 6m 4
Parameters: Maximum of 35 kA short-circuit current available; maximum of up to 0.5 sec (30 cycles) fault clearing time; working distance 455 mm (18 in.) Other 600-V class (277 V through 600 V, nominal) equipment
(20 ft)
1.5 m
Parameters: Maximum of 65 kA short circuit current available; maximum of 0.03 sec (2 cycles) fault clearing time; working distance 455 mm (18 in.) NEMA E2 (fused contactor) motor starters, 2.3 kV through 7.2 kV
2
(5 ft)
Parameters: Maximum of 35 kA short-circuit current available; maximum of up to 0.24 sec (15 cycles) fault clearing time; working distance 910 mm (36 in.) Metal-clad switchgear, 1 kV through 15 kV
4
Parameters: Maximum of 35 kA sort-circuit current available; maximum of up to 0.24 sec (15 cycles) fault clearing time; working distance 910 mm (36 in.) Arc-resistant switchgear Type 1 or 2 [for clearing times of <0.5 sec (30 cycles) with a perspective fault current not to exceed the arc-resistant rating of the equipment], and metal-enclosed interrupter switchgear, fused or unfused of arc-resistant-type construction, tested in accordance with IEEE C37.20.7, 1 kV through 15 kV
4
(40 ft)
N/A (doors closed)
N/A (doors closed)
Parameters: Maximum of 35 kA short-circuit current available; maximum of up to 0.24 sec (15 cycles) fault clearing time; working distance 910 mm (36 in.) Other equipment 1 kV through 15 kV
4 (doors open)
12 m (40 ft)
12m (40 ft)
12m
12m
Parameters: Maximum of 35 kA short-circuit current available; maximum 4 (40 ft) of up to 0.24 sec (15 cycles) fault clearing time; working distance 910 mm (36 in.) Note: for equipment rated 600 volts and below, and protected by upstream current-limiting fuses or current-limiting circuit breakers sized at 200 amperes or less, the arc flash PPE category can be reduced by one number but not below arc flash PPE category 1.
