9
Newmar • 1580 Sunflower Ave, Suite 100, Costa Mesa, CA 92626
Phone: 714-751-0488 • E-mail: [email protected]
A minimum circuit breaker to use for this system is a 20A, D-curve (note, a 20A C-curve breaker will
not
discriminate with the rectifier fuse). Therefore, when used with the 2.5mm
2
cable supplied, a 20A, D-curve
breaker should be used.
Alternatively, a 32A C-curve breaker, or greater, can be used. However, AC cable provided may have to
be replaced for a larger cable
1
.
If a fuse is used upstream, then any BS88 or NH g style fuse, of 20A or greater rating will discriminate.
6.5.
DC Cabling
CAUTION:
Use extreme care when fitting batteries & their connections. Remove all jewelry
and rings from oneself prior to commencing the installation. Always use insulated tools when fitting
batteries and take extreme care not to short terminals when working on them.
6.5.1.
Terminal Block Labeling
Note:
Your Centurion II Load & Battery Terminal Blocks maybe labeled differently than shown in photos
on the following page. Some Centurion II shelves’ terminal blocks are identified by Numbers which are
the
Live or Hot
terminals and the words
Batt. Common
or
Load Common
which are the
Return
or
Ground
terminals – see polarity table below.
System Voltage
“Numbered’ (AKA: Live or Hot)
‘Common’ (AKA: Return or Ground)
-48 VDC
-
+
+24 VDC
+
-
6.5.2.
Terminal Block Max Wire Size/Recommended Torque Specification
Connection
Max AWG
Recommended Torque
AC Input
8
10.5 in/Lbs.
AC Earth
2
22 in/Lbs.
Loads 1 – 8
8
10.5 in/Lbs.
Loads 9 - 16
10
10.5 in/Lbs.
Note:
A larger breaker may be used even though in theory it may appear that the 2.5mm wire is not
fully protected. In fact, it is protected on two accounts. Firstly, it is protected by the rectifier input
fuse (which is only a short distance away). Secondly, the rectifiers are power limited on their input.
Therefore, they can never be overloaded. As a result, the wire can never be over-loaded by the
rectifier – it can only see fault current. As a result, depending on local authorities, only fault current
protection may be catered for by the upstream protective device.