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SD-8 Alternator Feed 30A Inline Fuse Location

 
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Airdog77



Joined: 24 Nov 2013
Posts: 78
Location: Northern Virginia

PostPosted: Sat Apr 21, 2018 7:14 am    Post subject: SD-8 Alternator Feed 30A Inline Fuse Location Reply with quote

Bob,

In your response on the Z13 Battery Bus Protection question in a very recent post, you reminded us that
Quote:
Recall that circuit protection is for WIRES . . . and that the protective device is installed as close as practical to the SOURCE of energy that puts the wire at risk.

A friend of mine asked me a question on my Z-13/8 configuration that stumped me, so I thought I'd ask you.

In keeping in line with your statement above, in Z-13/8 why is the inline 30A fuse for the SD-8 wire connection from the battery contactor to the SD-8's S704-1 relay placed within 6 inches or less from the battery contactor, when the SD-8 is the source of energy?

Wade


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user9253



Joined: 28 Mar 2008
Posts: 1200
Location: Riley TWP Michigan

PostPosted: Sat Apr 21, 2018 7:24 am    Post subject: Re: SD-8 Alternator Feed 30A Inline Fuse Location Reply with quote

There are two sources of energy, the battery and SD-8. The SD-8 is self current limiting. It can put out perhaps 10 amps at most. Its output does not need to be fused. The battery can put out hundreds of amps and possibly do lots of damage. Placing the fuse near the battery will minimize the danger.

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PostPosted: Sat Apr 21, 2018 7:25 am    Post subject: SD-8 Alternator Feed 30A Inline Fuse Location Reply with quote

On 4/21/2018 10:14 AM, Airdog77 wrote:
Quote:


Bob,

In your response on the Z13 Battery Bus Protection question in a very recent post, you reminded us that
> Recall that circuit protection is for WIRES . . . and that the protective device is installed as close as practical to the SOURCE of energy that puts the wire at risk.
A friend of mine asked me a question on my Z-13/8 configuration that stumped me, so I thought I'd ask you.

In keeping in line with your statement above, in Z-13/8 why is the inline 30A fuse for the SD-8 wire connection from the battery contactor to the SD-8's S704-1 relay placed within 6 inches or less from the battery contactor, when the SD-8 is the source of energy?

Wade

I'm not Bob, but an alternator wire should be big enough to handle

everything an alternator can throw at it, meaning the alternator can't
damage it. But... The battery *can* damage it, so the protection is at
the potential source of the damage.

That help?

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Airdog77



Joined: 24 Nov 2013
Posts: 78
Location: Northern Virginia

PostPosted: Sat Apr 21, 2018 7:36 am    Post subject: Re: SD-8 Alternator Feed 30A Inline Fuse Location Reply with quote

Makes all the sense in the world.... now that you guys explained it!!

Crystal clear. Always good to learn something new!

Thanks Joe & Charlie!

Cheers,
Wade


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