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Anonymous Poster

Necessary to Connect Fuse at Negative Terminal of a DC Voltage System?

09/23/2010 12:52 AM

In one of the projects i had to design a dc distribution board..In the control circuit i had put only one fuse at the positive side..i have a doubt whether to install a fuse on the negative side of the control circuit..control voltage is 120v dc...
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lyn
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#1

Re: Is it necessary to connect a fuse at the negative terminal of a dc voltage syste

09/23/2010 12:58 AM

This is why I'm glad the we only have two equinoxes per year.
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TonyS
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Re: Is it necessary to connect a fuse at the negative terminal of a dc voltage syste

09/23/2010 1:28 AM

If the neutral is grounded no if not yes

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wareagle
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#3

Re: Necessary to Connect Fuse at Negative Terminal of a DC Voltage System?

09/23/2010 12:40 PM

Lynch, you are too funny.
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Tornado
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#4

Re: Necessary to Connect Fuse at Negative Terminal of a DC Voltage System?

09/23/2010 1:08 PM

There are also two solstices, so his cup runneth over...

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PeterT
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#5

Re: Necessary to Connect Fuse at Negative Terminal of a DC Voltage System?

09/23/2010 3:25 PM

DC distribution systems are typically run ungrounded. Battery chargers today usually include ground fault detection for this reason - the system can continue to operate if the DC becomes grounded inadvertently, but there is an alarm so you can troubleshoot and correct it before you have more problems.

Therefore, both the DC+ and DC- should be fused, because the fuse in the positive side won't protect everything in your circuit in the event of a shorted component.

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Previous in Forum: Difference Between XLPE and Paper Cable?   Next in Forum: 132 KV HT Transformer Queries
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