4.c.EFFECTS CURRENT PASSING THROUGH THE HUMAN BODY
28
Table 4.4.1 are the limits permanent touch voltage.2 with regard protection against indirect
contact will discussed later.1
Conditions Highest permissible touch voltage
(V)
a.4. d.4. The limits touch voltage
dependent time the duration are given Table 4. Nevertheless, the limits
presented Table 4.2 (according the IEC 1200-413).
.
Table 4.2 Maximum touch voltage duration
Prospective touch voltage
(V)
Maximum disconnecting time (duration touch voltage)
(s)
for
usual conditions wet conditions
25 >5
50 0,47
75 0,6 0,30
90 0,45 0,25
110 0,36 0,18
150 0,27 0,10
220 0,17 0,04
280 0,12 0,02
350 0,08 -
500 0,04 -
Application values given the Table 4.c.)
12 25
Conventional touch voltage limits (for equipment and including 1000V)
It evident that safety limits touch voltage should depend the duration touch
voltage similarly limits current passing through the human body.4.
Usual condition (dry but also little
or for short time damp, and also with
some conductive parts around)
50 120
Wet conditions conditions with
corrosion aggressiveness
25 60
Very bad conditions man standing
in water metal barrels etc
