
21-6 Electrical Variables
Safety is enhanced if shunts are placed in the ground leg of a circuit for that way the output leads, usually
on
ly
at 50 mV
,
ar
e
ne
ar
gr
ound
. Bu
t
th
at
in
troduces
a re
sistance
in th
e
gr
ound
pa
th
an
d
ca
n
in
terfere
wi
th
co
mmon
mo
de
re
quirements
of in
terdevice
si
gnal
co
nnections
. If th
e
sh
unt
is pl
aced
in th
e
hi
gh
si
de,
ca
re
mu
st
be ta
ken
to pr
otect
th
e
wi
ring
an
d
th
e
me
ter
to wh
ich
it is at
tached
fr
om
acc
idental
gr
ounds
.
So
metimes
su
cient
ac
curacy
ca
n
be ob
tained
by me
asuring
th
e
vo
ltage
dr
op
al
ong
a le
ngth
of co
n-
ductor,
w
hich
i
s
o
therwise
r
equired
i
n
t
he
i
nstallation
. I
n
a v
ehicular
s
ervice,
i
t
i
s
c
ommon
to s
ense
t
he ...