Current requirements, Safety issues – Meyer Sound 650-P User Manual
Page 4
4
Current Requirements
The 650-P presents a dynamic load to the AC mains
which causes the amount of current to fluctuate be-
tween quiet and loud operating levels. Since different
types of cables and circuit breakers heat up (and trip) at
varying rates, it is essential to understand the types of
current ratings and how they correspond to circuit
breaker and cable specifications.
The maximum continuous RMS current is the maxi-
mum RMS current over a duration of at least 10 sec-
onds. It is used to calculate the temperature increase in
cables, which is used to select cables that conform to
electrical code standards. It is also used to select the
rating for slow-reacting thermal breakers.
The maximum burst RMS current is the maximum
RMS current over a one second duration. It is used to
select the rating for most magnetic breakers.
The maximum instantaneous peak current during burst
is used to select the rating for fast-reacting magnetic
breakers and to calculate the peak voltage drop in long
AC cables according to the formula
V
pk
drop
=
I
pk
x
R
total cable
Use the table below as a guide to select cables and
circuit breakers with appropriate ratings for your oper-
ating voltage.
s
g
n
i
t
a
R
t
n
e
r
r
u
C
P
-
0
5
6
V
5
1
1
V
0
3
2
V
0
0
1
S
M
R
s
u
o
u
n
i
t
n
o
C
.
x
a
M
A
8
S
M
R
A
4
S
M
R
A
0
1
S
M
R
S
M
R
t
s
r
u
B
.
x
a
M
A
5
1
S
M
R
A
8
S
M
R
A
8
1
S
M
R
t
s
r
u
B
g
n
i
r
u
D
k
a
e
P
.
x
a
M
A
2
2
K
A
E
P
A
1
1
K
A
E
P
A
5
2
K
A
E
P
The minimum electrical service amperage required by a
system of Meyer speakers is the sum of their maximum
continuous RMS
currents. We recommend allowing an
additional 30% above the minimum amperage to prevent
peak voltage drops at the service entry.
TROUBLESHOOTING NOTE: In the unlikely case that
the circuit breakers trip (the white center buttons pop
out), do not reset the breakers! Contact Meyer Sound for
repair information.
Safety Issues
Pay close attention to these important electrical and
safety issues.
Use a power cord adapter to drive the 650-P
from a standard 3-prong outlet (NEMA 5-15R;
125V max).
earth
ground
chassis
ground
The 650-P requires a grounded outlet. Always use
a grounding adapter when connecting to un-
grounded outlets.
Do not use a ground-lifting adapter or cut the AC
cable ground pin.
Keep all liquids away from the 650-P to avoid hazards
from electrical shock.
Do not operate the unit if the power cables are frayed or
broken.
Tie-wrap anchors on the amplifier chassis provide strain
relief for the power and signal cables. Insert the plastic
tie-wraps through the anchors and wrap them around the
cables.
The cabinet, exposed electronic circuitry, and drivers
can receive protective treatment that permits safe use in
wet conditions. Additionally, a rain hood can be fitted to
shield cables and electronics. Do not install a unit out-
doors without weather protection! Contact Meyer Sound
for more information.