Installation
61287722G1-5B
21
Alternative Grounding Method
The
following
is
an
alternative
grounding
method
if
MGN
is
not
available.
Article
800
‐
11c
of
the
National
Electrical
Code
(NEC)
states
for
the
purpose
of
grounding
the
point
of
entry
for
communications
wiring
and
cables
should
be
within
20
feet
(6.1
meters)
of
the
electrical
service
entry
point.
Where
this
is
impractical,
a
separate
grounding
electrode
should
be
installed
in
compliance
with
Article
800
‐
40
‐
(b)(3)
and
bonded
in
compliance
with
Article
800
‐
40(c)
and
(d).
Briefly
stated:
• A
copper
clad
steel
ground
rod
should
be
driven
into
the
earth
at
least
8
feet
(2.4
meters)
deep.
• An
Earth
Resistance
Megger
Test
Set
is
used
to
determine
the
resistance
of
the
earth
electrode.
The
NEC
requires
this
ground
rod
conduction
to
earth
to
be
no
more
than
25
ohms
of
resistance.
If
25
ohms
cannot
be
achieved
with
a
single
electrode
(ground
rod),
a
secondary
electrode
must
be
used
and
bonded
to
the
primary
electrode
using
a
12
AWG
minimum
copper
ground
wire.
• The
secondary
electrode
must
be
spaced
at
least
8
feet
(2.4
meters)
from
the
primary
electrode.
• The
12
AWG
ground
wire
should
be
connected
to
the
ground
rod
with
a
UL
Listed
ground
clamp.
Local Power Source Wire Run
WARNING
!
•
Before
making
any
power
connections
to
this
equipment,
verify
the
power
is
off
(fuse
removed/breaker
tripped).
•
This
equipment
should
only
be
operated
from
the
type
of
certified/listed
power
supply
recommended
by
the
manufacturer.
CAUTION
!
•
Use
caution
when
routing
wires
and
cables.
Avoid
severe
bending
and
routing
over
sharp
edges.
Use
grommet
material
when
possible
to
avoid
wear
on
cable
insulation.
•
To
reduce
the
risk
of
fire,
use
minimum
no.
26
AWG
telecommunications
line
cord.
Installation
of
the
Limited
Power
Source
(LPS)
will
be
dictated
by
on
‐
site
conditions
and
local
telephone
company
practices.
Refer
to
and
the
following
steps
to
complete
the
installation.
1. Install
the
Local
Power
Source
(LPS)
wire
run
from
the
SBU
ONT
to
the
connector
of
the
LPS
via
the
customer
provided
PVC
conduit
(or
method
used
by
your
local
telephone
company).
For
power,
ADTRAN
recommends
using
16
AWG
wire
at
a
maximum
of
100
feet
(30.5
meters).
For
alarm
signals,
ADTRAN
recommends
using
24
AWG
wire.
Do
not
plug
in
the
UPS
green
connector
at
this
time.
This
will
be
done
after
the
subscriber’s
wire/
cables
are
terminated
during
turn
‐
up
and
testing.
2. If
necessary,
tie
wrap
both
the
12
AWG
ground
wire
and
LPS
wire
run
to
the
buried
fiber
drop
cable
riser
conduit.
Summary of Contents for 1287722G1
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Page 10: ...Total Access 372 Small Business Unit ONT Installation and Maintenance Guide x 61287722G1 5B ...
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