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ContinuousWave: Small Boat Electrical
Secondary Power Distribution Wiring
|Author||Topic: Secondary Power Distribution Wiring|
posted 06-16-2010 08:50 PM ET (US)
The [audio entertainment device] I want to install has a red
posted 06-17-2010 02:49 PM ET (US)
Depends. If the stereo switch is double pole it will likely have power and neutral run to the switch and you can just connect to the switch. If it is a single pole switch then you will have to run one lead to the neutral common located somewhere in your boat in addition to the stereo switch.
If you eliminate the in-line fuse in your radio lead then be sure to replace the fuse for the branch circuit that powers your stereo switch with one of a similar rating. If the stereo switch is not on its own branch circuit then leave the in-line fuse in your radio lead.
posted 06-17-2010 08:34 PM ET (US)
Most secondary power distribution panels have a battery negative bus which is used to accumulate and connect the many negative power branch circuits. If a power control switch has the battery negative wired to the switch, this circuit is typically only provided to illuminate a lamp in the switch circuit. It is not intended as a place to wire secondary loads.
You can wire the positive feed to a secondary load to the switch that is intended to control that load. The recommended wiring practices for small boats is described and illustrated in an article in the REFERENCE section.
posted 06-17-2010 09:04 PM ET (US)
I do not see much value (or even much logic) in connecting devices which have their own ON-OFF switch to a secondary branch circuit which is controlled by its own ON-OFF switch. This is especially true of modern electronic devices where the ON-OFF switch is actually an electronic switch, and, if the there is no power supplied to the device, the switch loses its memory of what state it was in and reverts to OFF. All this does is require that you turn on two switches to get the device to transition to the ON state. If you want to have a device where you have to turn two switches to ON in order to power the device, then wire the device to a branch circuit with a power control switch. Otherwise, wire the device to the secondary power distribution bus.
posted 06-17-2010 10:46 PM ET (US)
I don't see an absolute need in the switch redundancy - BUT - using a secondary branch circuit switch - makes that switch a "master" - turn it off and all components connected to that branch circuit are switched off. --- Jerry/Idaho
posted 06-17-2010 10:57 PM ET (US)
Jerry--I agree that a master OFF switch for a branch circuit can be handy if you have several devices connected. If only one device is connected to the circuit, having two power switches wired in series seems a bit illogical. It wouldn't be as bad if the device had a mechanical type power switch which remembered its state even when the power was off. So many of these modern devices have electronically operated power switches. If you turn off the power to the device, the device also turns itself off. The next time power is restored to the branch circuit, you have to turn the device back on, again.
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