INSTALLATION (continued)
1 --- 5
Do not manually operate the transfer switch
until both power sources are disconnected:
open both circuit breakers.
TableC. Maintenance handle positions on 150–1200 amp. transfer switches. .
Tran sfe r Switc h
Position
J–design 150---600 A
Interlocked Shafts 1
Link between contact
shafts prevents closing
both N & E contacts
H–design 800---1200 A
Interlocked Weights 2
Lobes prevent
closing both N & E
contacts
Maintenance
Handle Shaft Indicators
N
o
r
m
a
l
E
t
t
h
f
t
hub
l
o
b
e
l
o
b
e
weight hub up
E=O
uppercontacts open
N
orma
l
Nlink
contact sha
f
ts
hub
l
o
b
e
l
o
b
e
weight
hub
up N=C
lowercontacts closed
Load
E
up
E=O
uppercontacts open
L
o
a
d
Disconnected
N
down
N=O
lowercontacts open
E
m
e
r
g
e
n
c
y
E
down
E=C
uppercontacts closed
E
mergency
N
down
N=O
lowercontacts open
Note 1: The hub and contact shaft turn in oppositedirections through a cam follower mechanism.
Note 2: The hub and contact shaft turn in the same directions.
Note: If Normaland Emergency connections are reversed this operation is also reversed.