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Showing results 1 to 25 of 134
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Search: Posts Made By: fairbank56
Forum: Electrical Systems 10-05-2012
Replies: 6
Views: 763
Posted By fairbank56
Re: Fusing to the size of the wire....

Not necessarily. It can be either way depending on the situation. Because of the wire sizing requirements of 12 volt circuits, the wire can typically handle way more current than the load requires....
Forum: Electrical Systems 09-28-2012
Replies: 22
Views: 2,660
Posted By fairbank56
Re: Alternator Output Wire

While a battery disconnect switch is only an ABYC requirement for batteries with a CCA greater than 800 amps, I strongly suggest NOT bypassing the switch and connecting your battery directly to the...
Forum: Electrical Systems 09-27-2012
Replies: 16
Views: 1,513
Posted By fairbank56
Re: Grounding Batteries to Eng. Block

That might be what they are refering to but that's technically incorrect. They are not the same as clearly stated in ABYC rules, "DC grounding systems shall not be used as a return conductor".

...
Forum: Electrical Systems 09-26-2012
Replies: 16
Views: 1,513
Posted By fairbank56
Re: Grounding Batteries to Eng. Block

While the DC negative (DC grounded conductor) may be connected to ground, they are not the same. DC grounding conductors are normally non-current carrying.

Eric
Forum: Electrical Systems 09-26-2012
Replies: 16
Views: 1,513
Posted By fairbank56
Re: Grounding Batteries to Eng. Block

In what context was he using this statement as it relates to the DC system on a boat???

Theoretecally and ideally, earth ground is an infinite source or sink of charge which means it can give...
Forum: Electrical Systems 09-26-2012
Replies: 20
Views: 1,497
Posted By fairbank56
Re: What size AC breaker?

This is as stated in ABYC rules which are recommended standards for boat wiring in the U.S.



The maximum ampacity rating of copper wiring is based on its physical size as well as the...
Forum: Electrical Systems 09-26-2012
Replies: 20
Views: 1,497
Posted By fairbank56
Re: What size AC breaker?

You have no other choice except to unplug as you said. That may or may not be feasable depending on your requirements. The main problem that Iv'e seen with shore power connections/cables is due to...
Forum: Electrical Systems 09-26-2012
Replies: 20
Views: 1,497
Posted By fairbank56
Re: What size AC breaker?

If there is not a standard current rating of a breaker equal to the maximum allowable current for the conductor, the next larger standard current rating may be used, provided it does not exceed 150...
Forum: Electrical Systems 09-26-2012
Replies: 20
Views: 1,497
Posted By fairbank56
Re: What size AC breaker?

Only if the boat is equipped with a reverse polarity indicator or isolation transformer. If not, the branch circuit breakers must be douple pole.

Eric
Forum: Electrical Systems 09-26-2012
Replies: 20
Views: 1,497
Posted By fairbank56
Re: What size AC breaker?

A dual simultaneous trip circuit breaker is an ABYC requirement for 120vac single phase shore power feed.

Eric
Forum: Electrical Systems 09-26-2012
Replies: 20
Views: 1,497
Posted By fairbank56
Re: What size AC breaker?

It is protected by the breaker in the shore based distribution panel that feeds the shore power receptacle.

Eric
Forum: Electrical Systems 09-24-2012
Replies: 3
Views: 352
Posted By fairbank56
Re: what connector?

What second locknut? There's only one. Just use a PL-258 that has a narrow midsection like the one Defender sells. Never had an issue with running out of threads. There's supposed to be a solid...
Forum: Electrical Systems 09-22-2012
Replies: 37
Views: 6,198
Posted By fairbank56
Re: How do Shunts work?

You'd be reversing the polarity of the voltage measured across the "charge" shunt and you can't just reverse the brown and green wires that measure that voltage.

Eric
Forum: Electrical Systems 09-22-2012
Replies: 37
Views: 6,198
Posted By fairbank56
Re: How do Shunts work?

The way this Microlog DMM-1 monitor is wired, with it's dual shunt, seems rather unusual to me. Even when the alternator is charging, it's going to monitor load current through the left side of the...
Forum: Electrical Systems 09-19-2012
Replies: 37
Views: 6,198
Posted By fairbank56
Re: How do Shunts work?

Because the starter current path is from battery negative to the center connection of your dual shunt, through the shunt, to your engine block, through the starter and back to the battery positive....
Forum: Electrical Systems 09-19-2012
Replies: 37
Views: 6,198
Posted By fairbank56
Re: How do Shunts work?

Be careful with this installation. There are cautions in the installation manual about this. Depending on your setup, you could be sending full starting current through the shunt which could be...
Forum: Electrical Systems 09-18-2012
Replies: 37
Views: 6,198
Posted By fairbank56
Re: How do Shunts work?

The "standard" types used on boats are more accurate than that resistor (±1% tolerance and ±60ppm/°C). Typical rating for marine shunts are resistor accuracy of less than ±.25% and ±20ppm/°C...
Forum: Electrical Systems 09-18-2012
Replies: 37
Views: 6,198
Posted By fairbank56
Re: How do Shunts work?

The shunt you have is actually a dual shunt (two back to back shunts). The large blocks are brass, the bars are soldered to the brass blocks and are a precision resistance alloy called manganin which...
Forum: Electrical Systems 09-18-2012
Replies: 37
Views: 6,198
Posted By fairbank56
Re: How do Shunts work?

Very misleading. The resistance value of a 100 amp 50 millivolt shunt is .0005 ohms, well well below 1 ohm. A 1 ohm shunt would cripple a 12 volt system very quickly. Most shunts are rated at 50...
Forum: Electrical Systems 09-18-2012
Replies: 37
Views: 6,198
Posted By fairbank56
Re: How do Shunts work?

A shunt is just a resistor that produces a voltage drop when current passes through it. The voltage drop is measured and displayed as current.

Eric
Forum: Electrical Systems 08-16-2012
Replies: 31
Views: 2,246
Posted By fairbank56
Re: Redoing shore power correctly

You can use 14 for the short pigtail wire because as per ABYC that size single conductor wire not bundled, sheathed or in conduit and outside of engine compartment can safely handle 35 amps of...
Forum: Electrical Systems 08-16-2012
Replies: 31
Views: 2,246
Posted By fairbank56
Re: Redoing shore power correctly

Do not connect your safety grounds through that chincy ground screw. You need to provide another connection point within the junction box and pigtail another wire to that point. You can safely use 14...
Forum: Electronics 08-12-2012
Replies: 15
Views: 1,736
Posted By fairbank56
Re: ICOM SSB and ADSP filter kit?

Since this is new to you, I assume you're not too familiar with SSB communications. Because of the type of modulation and frequency range used, it is highly subject to atmospheric noise, both natural...
Forum: Electrical Systems 08-06-2012
Replies: 31
Views: 2,246
Posted By fairbank56
Re: Redoing shore power correctly

Last I heard, the requirement was delayed til Dec 31st of this year.

Eric
Forum: Electrical Systems 08-06-2012
Replies: 31
Views: 2,246
Posted By fairbank56
Re: Redoing shore power correctly

A reverse polarity indicator is also an ABYC requirement as are ELCI's (equipment leakage circuit interrupter) on new installations. Even though you have a minimal AC system, you may want to consider...
Showing results 1 to 25 of 134

 

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