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POWER
DISTRIBUTION
If
a
new power
service
is
being
installed for the
650 System,
it
is
suggested
that the
service be large
enough
to
handle
any
future
expansion
of the
system
For
single
-phase
power
the
service should be three wire.
The
third
wire
is
for
grounding and
must
not
carry current
from
any source
For
three-phase
power
the
service should be four wire.
The
fourth
wire
is
for
grounding
only
and
must
not
carry current
from
any source
Typical wiring
diagrams
are
illustrated
on pages
36
and
37.
Suitable protective
devices should
be
installed
on
the line
.
Typical
examples
are
as
follows:
A.
Three
-pole safety
switch -fuse
combination equipped
with
superlag
fuses.
B.
Circuit
breaker
with a
Heinemann
curve
1
trip
or
equivalent.
If
circuit
breakers are
used, their contacts should
be rated so
that
a high
current
fault will
not
cause
contact welding.
If
these protective devices
are
located outside
of the
machine room,
it
is
desirable
that
a
remote means
of
operation be provided
in the
machine area
.
This
is
a
safety
precaution
so
all
650
power
may
be
cut
off
quickly
Lightning Pro
tection
It
is
recommended
that
the
customer
install
lightning protection
on
his
secondary
power
source when:
A.
the
utility
company
installs
lightning
protectors on
the
primary,
B
.
primary power
is
supplied
by an overhead
power
service,
C
.
the
area
is
subject
to
electrical
storms
or equivalent
type
power
surges
A
recommended
type
of
service protector
to
be
installed
is
the
G.E.
Pellet-
Type,
Model
9LA15A1
or
Model 9LA15A4,
or
its
equivalent.
One
of either
model
is
required
for
single-phase
and two
of
either
model
is
required
for
three-phase.
The
determination as
to
whether
lightning protection
is
desirable, the selection of
the
service protector
needed and
its
proper
installation
are
to
be
made
by
the
customer.
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