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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
Use the table below as a guide to select cables and
circuit breakers with appropriate ratings for your oper-
ating voltage.
6
5
0
P -
C
M
a
. x
C
o
t n
n i
u
o
u
s
R
M
S
M
a
. x
B
r u
t s
R
M
S
M
a
. x
P
e
a
k
D
r u
n i
g
B
r u
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.
I
R
=
x
pk
total cable
r u
e r
t n
R
t a
n i
g
s
1
1
5
V
2
3
0
V
1
0
0
8
A
4
A
1
0
A
R
M
S
R
M
S
1
5
A
8
A
1
8
A
R
M
S
R
M
S
2
2
A
1
1
A
2
5
A
t s
P
E
A
K
P
E
A
K
!
Safety Issues
Pay close attention to these important electrical and
safety issues.
V
R
M
S
R
M
S
P
E
A
K
earth
ground
chassis
ground
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