Blue Sea Systems PN 8261 Marine GPS System User Manual

Marine Electrical Prod
DC Power Distribution Panel
PN 8261 8 Position Water Resistant
PN 8262 4 Position Water Resistant
Panel Speci cations
Material: 0.100” 5052-H32 Aluminum Alloy
Primary Finish: Chemical Treatment per Mil Spec C-5541C
Final Panel Finish: Graphite color 2 part textured Polyurethane
Fuse Holder: Accepts commonly available AGC (fast acting) and
MDL (slow blow) 1-1/4” x 1/4” glass fuses.
Fuses: 15 Ampere AGC (fast acting) fuses installed.
Amperage Rating: Switches and Fuse Holders,
20 amperes maximum for 12 volt system
15 amperes maximum for 24 volt system
Cumulative Rating: 45 Amperes
Voltage Rating: Panels are rated for 12 or 24 volts DC.
Circuit Indicator: LED embedded in switch, rated 100,000 hour 1/2 life
Panel Depth: 2-3/4” 69.90mm
PN Inches Millimeters
Overall Dimensions: 8261 9-3/8 x 3-3/4 238.00 x 95.30
8262 5-1/4 x 3-3/4 133.40 x 95.30
Mounting Centers: 8261 8-17/32 x 2-29/32 216.90 x 74.20
8262 4-13/32 x 2-29/32 112.30 x 74.20
Water Resistant: Will withstand the water exposures normally
encountered in above deck applications: Salt spray,
rain, hose washdowns, momentary immersions.
The Purpose of a Panel
There are ve purposes of a marine electrical panel:
• Power distribution
• Circuit (wire) protection
• Circuit ON/OFF switching
• Metering of voltage and amperage (In panels with meters)
• Condition Indication (circuit energized)
Blue Sea Systems Inc. Phone (360) 738-8230
425 Sequoia Drive Fax (360) 734-4195
Bellingham, WA 98226 USA E-mail
Document 9836 Rev.F
@It is not possible within the scope of these instructions to fully acquaint
the installer with all the knowledge of electrical systems that may be
necessary to correctly install this product. If the installer is not
knowledgeable in electrical systems we recommend that an electrical
professional be retained to make the installation.
@If the panel front is to be exposed to water it must be properly sealed to
the instrument panel surface. The included gasket must be in place
and the panel screwed down tight.
@The panels must not be installed in explosive environments such as
gas engine rooms or battery compartments as the switches are not
ignition proof.
@The main positive connection must be disconnected at the battery post
to avoid the possibility of a short circuit during the installation of this
distribution panel.
Any Blue Sea Systems product with which a customer is not satis ed
may be returned for a refund or replacement at any time.
Useful Reference Books
Calder, Nigel, 1996: Boatowner’s Mechanical and Electrical Manual,
2nd edition, Blue Ridge Summit, PA: TAB Books, Inc.
Wing, Charlie, 1993: Boatowner’s Illustrated Handbook of Wiring,
Blue Ridge Summit, PA: TAB Books, Inc.
Related Products from Blue Sea Systems
PanelBack Insulating Covers
High Amperage Fuses and Circuit Breakers for positive feed wires
High Amperage Battery Switches
Terminal Blocks and Common Bus Connectors
AC Distribution Panels
DC Distribution Panels
AC and DC Voltmeters and Ammeters
1. Calculate the maximum sustained amperage of the circuit. Measure
the length of the circuit from the power source to the load and back.
2. Decide whether the circuit runs in an engine space or non engine
space. Engine spaces are assumed to be at 50 degrees C, non engine
spaces are assumed to be at 30 degrees C.
3. Multiply the maximum current times the length of the circuit to calculate
Famps (Feet x amps).
4. Base the wire on either the 3% or 10% voltage drop. In general, items
which affect the safe operation of the boat and its passengers (running
lights, bilge blowers, electronics and distribution panel supply circuits)
use 3%; all other loads use 10% (cabin lights, bait pumps).
5. Starting in the column which has the right voltage and voltage drop
shown at the top, run down the list of numbers until arriving at a value
which is greater than the calculated Famps. Move left to the Ampacity
column to verify that the total amperage of the circuit does not exceed
the maximum allowable amperage of the wire size for that row. If it
does, move down until the wire ampacity exceeds the circuit
amperage. Finally, move left to the wire size column to select the wire
a. A 12 volt system at 10% drop with a 40’ circuit x 45 amps = 1800
Famps. A wire size of 8 is required.
b. A 24 volt system at 3% drop with a 10’ circuit x 100 amps = 1000
Famps. A wire size of 6 is required.
Note: This chart assumes wire with 105°C insulation rating and AWG wire sizes.
*Metric wire sizes may be used if of equivalent circular mil area.
Wire Sizing Chart