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Su
r
ge Pr
otectiv
e D
e
vi
ces
Ins
t
al
la
tion,
Opera
tion and
M
ai
nt
en
an
c
e
M
an
u
al
5
IO
-
70103
Re
v 0, 1/2013
Neutral
Phases
Groun
d
Neutral
Phases
Ground
P
ARALLEL
C
ONN
ECTI
ONS
T
ypical
Par
allel
C
on
nec
tions
(with
out
In
t
ernal
Rotar
y Dis
c
on
nec
t)
T
ypical
Par
allel
C
on
nec
tions
(with In
t
ernal
Rotar
y Dis
c
on
nec
t)
T
o
Pr
ot
ect
ed
Lo
ads
T
o
Pr
ot
ect
ed
Lo
ads
Pr
ot
ect
ed
P
an
el
Wir
e
shoul
d
be
l
es
s than 5
feet
an
d
straigh
t
as
p
os
sibl
e
Ne
utra
l
P
ha
se(s
)
T
ransi
en
t
Groun
d
S
afe
ty
Groun
d
Su
r
ge
Pr
ot
ec
ti
v
e
De
vi
ce
Pr
ot
ect
ed
P
an
el
Wir
e
shoul
d be
l
es
s than 5 feet
an
d
straigh
t
as p
os
sibl
e
Rota
ry
Dis
c
onne
ct
Ne
utra
l
Pha
se(s
)
T
ransi
en
t
Groun
d
S
afe
ty
Groun
d
Su
r
ge
Pr
ot
ec
ti
v
e
De
vi
ce
Grounding
c
ondu
ctor
s
mu
st be rou
t
ed with the
a
ss
oc
ia
t
ed
p
ow
e
r
c
ondu
ctor
s in the same ra
c
ew
a
y (
c
onduit). Wh
e
n
met
allic ra
c
ew
a
ys are
used
, adeq
ua
t
e
e
le
ctr
ical
con
tinui
t
y
mu
st be
m
ai
nt
ai
ned
a
t all ra
c
ew
a
y
c
onne
c
tions,
par
ti
cular
ly
ra
c
ew
a
y
ter
mi
na
tions
t
o the
e
le
ctr
ical
enclo
sur
e
s.
The
use o
f i
so
la
ting b
u
shin
g
s or
o
th
e
r m
e
ans
t
o i
nte
rr
up
t a
met
allic
c
onduit
r
un is a p
otenti
al s
afet
y
ha
za
r
d and is n
o
t
re
c
omm
e
nde
d.
G
rounding Ele
c
trode
Su
rg
e pr
otec
ti
v
e d
e
vi
ce
s do n
o
t
di
sc
har
ge all su
rge
s
t
o ground (
ear
th). Su
r
ge pr
otec
ti
v
e
de
vi
ce
s can al
s
o di
ver
t the su
r
ge
curren
t back
t
o its
s
our
c
e
t
o
c
ompl
et
e the
e
le
ctr
ical
c
ir
c
uit.
In the c
as
e
o
f l
i
ghtning wh
os
e p
otenti
al is d
eve
loped with
res
pe
c
t
t
o th
e
ear
th, the
S
PD di
ver
ts the su
r
ge
curren
t
t
o the grounding
e
le
c
trode (
ear
th
c
onne
c
tion). H
owe
ver
,
f
or
mo
st transi
en
t su
rge
s t
ha
t are d
eve
loped
b
y
s
wi
tc
hing
lo
ads, the
S
PD di
ver
ts the su
r
ge
curren
t back
t
o its
s
our
c
e
without i
nv
olving the grounding
e
le
c
trod
e.
F
or prop
e
r
S
PD p
erform
an
ce
, the
ser
vi
c
e
en
tran
c
e
grounding
e
le
c
trode
s
ys
te
m
mu
st
c
omply with the N
E
C
b
y
ha
ving all
av
ai
l
able
e
le
c
trod
e
s (building s
tee
l, m
et
al
wate
r
p
ip
e
, d
rive
n rods,
c
oncr
et
e
e
nc
as
ed
e
le
c
trod
e
s,
e
tc
.)
prop
er
ly
bonded
t
og
e
th
er
and
c
onne
ct
ed
t
o the p
ow
e
r
s
ys
te
m grounding.
The
us
e
o
f a
sep
ar
at
e grounding
e
le
c
trode
t
o ground the
S
PD d
e
fe
a
ts
the
effec
ti
ven
es
s of
the
SPD,
is
a potenti
al
safety
ha
za
rd
,
ma
y ca
us
e equipm
en
t
dam
ag
e
, is an N
E
C vio
la
tion
(r
e
fe
renc
e N
E
C 250
-
51 and 250
-
54),
and is n
o
t
re
c
omm
e
nde
d.
Ne
ut
r
al
C
on
nec
tion
F
OR P
R
OPER AND
SAFE
OPER
A
TION, THE
SPD s
NEUTRAL, MU
ST
BE
RELIAB
LY
C
ONN
EC
TED
TO THE NEU
TRAL OF THE
SOUR
CE.
F
AI
L
URE
T
O P
RO
VIDE A RELIABLE N
EU
TRAL
C
ONN
EC
TION M
A
Y R
ESUL
T IN
F
AI
L
URE!