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Table 1. Estimated effects of 60 Hz AC currents* ) V8 J; {. t0 A8 y
/ s& c: K* W4 N7 K4 \1 Z$ q7 O
1 mA Barely perceptible
3 z8 P! s% D# f% G16 mA Maximum current an average man can grasp and “let go” 6 ]9 Y- J) d, y5 ?
20 mA Paralysis of respiratory muscles ( h) |6 g* e/ C) [) W" P
100 mA Ventricular fibrillation threshold
0 s7 ^2 d. E6 Y5 u( e3 [2 A Cardiac standstill and internal organ damage 1 n* X9 _1 \3 {1 y+ V, V
15/20 A Common fuse breaker opens circuit† " O: G- E7 }7 o
9 f' i; R" c$ S5 F' b5 [$ g. ]% x2 b
*From NIOSH.1
* u( e/ v8 Y( \0 H* x0 r†Contact with 20 mA of current can be fatal. As a frame of reference, common household circuit breaker may be rated at 15, 20, and 30 A.
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