Blue Sea Systems PN 8195 Manual De Usuario

 

  Determine the proper wire size for each branch circuit using the chart  
  below. Verify that the standard circuit breakers installed in the panel are  
  correct for each branch circuit. Remove and replace any that are    
  incorrectly sized. The circuit breaker must have a rating less than the  
  allowable amperage of the wire, yet greater than the circuit’s 
  continuous current.

  Connect each branch circuit hot (black) to the appropriate load terminal.  
  Connect each branch circuit neutral (white) to one of the screws on the  
  neutral bus. Connect each branch safety ground wire (green) to one of  
  the screws of the safety ground bus.

  Do not confuse the neutral current carrying wires (sometimes called  
  ground) with the green normally non-current carrying wires (sometimes  
  called grounding). These two wires must be connected only at the source  
  of power, nowhere else.

Use the wire sizing chart below to determine the proper branch 

and feed circuit wire sizes.

Next, connect a minimum 16 AWG red wire from the screw on the side of 
the shunt positive terminal to the meter positive terminal and connect a 
black or yellow wire from the shunt negative terminal to the meter 
negative terminal. There should be a 1 ampere fuse in both sense wires 
near the shunt terminal. Be certain that on all 4 shunt connections the 
wire ring terminals sit directly on the brass blocks of the shunt without any 
washers in between.

  Connect a negative return wire from both negative buses on the panel  

to DC negative.

The panel is supplied with a meter and switch to monitor the voltage of 
three separate sources, usually the batteries. Connect a minimum 16 
AWG red wire from each source to be monitored to each of the 
corresponding input wires of the switch. There should be a 1 ampere fuse 
in each positive wire near each source.

 

  Determine the proper wire size for each branch circuit using the  

 

  guidelines in step 4. Verify that the standard 15 amp circuit breakers  
  installed in the panel are large enough for each branch circuit. Remove  
  and replace with a higher amperage any that are undersized. Connect  
  the positive (red) branch circuit wires to the load terminals of each circuit  
  breaker. Connect each negative (black) branch circuit wire to the DC  
  Negative Bus. DO NOT CONFUSE THE DC NEGATIVE BUS WITH THE  
  DC GROUNDING BUS.

Connect the yellow negative wire to the panel negative bus.

To activate the label lights by the boat’s battery switch, connect the red  
positive wire to the DC panel positive bus.

To activate the label lights by an independent switch or breaker, connect 
the red positive wire to the load side of the switch or breaker.

6. Optional—install grounding system wire

  The grounding wire (bare, green or green with yellow stripe and normally  

  non-current carrying) should not be confused with the negative ground  

  wire (black or yellow and normally current carrying). 

  In Boatowner’s Illustrated Electrical Handbook, Charlie Wing identifies  

  three purposes of DC Grounding:

  1.  Holding conductive housings of low voltage (under 50 volts) DC    
    devices at ground potential by providing a low resistance return    
    path for currents accidentally contacting the device cases. 
  2.  Providing a low resistance return path for electrical current,  

 

    preventing stray currents that may cause corrosion.
  3.  Grounding metal electrical cases to prevent emission from inside  
    or absorption from outside of radio frequency noise (RFI).

  ABYC requires that grounding wires be sized no smaller than one wire  
  size under that required for current carrying conductors supplying the  
  device to which the grounding wire is connected.

This panel is supplied with LEDs pre-installed in all optional branch 
positions. For future expansion of the panel remove the positive leg of 
the LED from the negative bus and connect it to the load side of the 
corresponding branch circuit breaker.

Remove and replace the existing 8-16V DC voltmeter with an 18-32V DC 
voltmeter (PN 8240). Connect the existing meter sense wires to the   
new meter, Red Positive wire to “+” and Yellow Negative wire to “-”.

This Blue Sea Systems electrical distribution panel is furnished with 15A 
circuit breakers for DC branch circuits. These ratings will satisfy the vast 
majority of marine circit protection situations. As shown in the Wire Sizing 
Chart, even 16 AWG wire, which is the minimum wire size recommended by 
ABYC, has an allowable amperage greater than 20A.

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.  Does  the circuit run in an engine space or non engine space. 
3.  Calculate Famps (Feet x amps). Multiply circuit length by max. current.
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) use 3%; all other loads use 10%.
5.  Starting in the column which has the right voltage and voltage drop,  
  run down the list 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 size.

Example
a. 

A 12 volt system at 10% drop with a 40’ circuit  x 45 amps = 1800   

 

Famps. A wire size of 8 is required.

8704 Rev. 008

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