Multi Switch panel wiring help

[ohanacreek]

Started the rewire project on my 700-4 today. Replacing fuse panel wit this waterproof relay/ fuse box.





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Looks familiar

 

[Admin]

 

[Tramguage1]

This thing may be expensive, but it's a high quality part.

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[JTW]

Looks familiar

Yup..

 

[allgm1]

I hadn't even thought of running multiple light switches from 1 fuse. Makes sense though. I could just come off a 30A fuse on the block and supply the switches for light bar, rear lights, and dome lights. That gives me 360 Watts for lights. I plan to be under 250W with a.

just don't try all of this on a 14 ga wire. you can run 30 amp fuses all day long as long as you have the wiring to handle it.

 

[Tramguage1]

New 50" 480watt light bar on its way. $83 shipped.

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[IdahoPioneer]

just don't try all of this on a 14 ga wire. you can run 30 amp fuses all day long as long as you have the wiring to handle it.

True that. I've already calculated the different wire sizes I'll need for each circuit.

 

[JTW]

This thing may be expensive, but it's a high quality part.

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Is it just me or do the constant hot circuits seem to be lite on their wire size? I guess I have a tendency of over doing things but I don't like electrical problems. And the ground wire for the fuse panel seemed lacking.

 

[Tramguage1]

The ground wire is only for the relays, so the current draw is pretty low. 12ga relay output wires are good for 20 amps. And constant 16 GA. should handle 10 amps.
I just ordered a 480 watt light bar that should draw 40 amps at 12vdc. I will run this through a heavier relay that I will control from my switch panel.

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[JTW]

The ground wire is only for the relays, so the current draw is pretty low. 12ga relay output wires are good for 20 amps. And constant 16 GA. should handle 10 amps.
I just ordered a 480 watt light bar that should draw 40 amps at 12vdc. I will run this through a heavier relay that I will control from my switch panel.

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I didn't think about the relays needing a ground.. it had me all out of sorts. I do wish the constant wires were heavier as I plan to have my soundbar on a constant circuit. It did however only come with a 15 amp inline fuse even though it's a 400 watt max output bar. So we'll see how it much it actually pulls.

 

[Tramguage1]

I didn't think about the relays needing a ground.. it had me all out of sorts. I do wish the constant wires were heavier as I plan to have my soundbar on a constant circuit. It did however only come with a 15 amp inline fuse even though it's a 400 watt max output bar. So we'll see how it much it actually pulls.

I think the wattage you are talking about is the output of the radio not the wattage of current draw of the sound bar.

 

[JTW]

I think the wattage you are talking about is the output of the radio not the wattage of current draw of the sound bar.

That makes more sense.. I don't really understand where the difference is though.

 

[ohanacreek]

That makes more sense.. I don't really understand where the difference is though.

Amps=watts/volts
Watts=Amps*Volts
Volts=watts/amps

7,000,000 watt home service @17500v is 400amps its dropped to 120/240 for use in home and is limited to 400amps which only gives you 96000watts(240)/48000watts(120)

[electricians correct me please]

9000 watt dbl oven on 240v is 37.5 amps

480watt light bar at 12v is 40amps

Sometimes you will have a device that will change voltage to get more wattage output with fewer amps.

Amps affect wire size drastically. Amps are the main measure of electrical force/current.

 

[Tramguage1]

Not sure this will help!

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[Tramguage1]

@joeymt33 or @Hondasxs @ohanacreek I need to remove the first drawing I posted its incorrect. I uploaded a revised drawing . Thanks

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[JTW]

Amps=watts/volts
Watts=Amps*Volts
Volts=watts/amps

7,000,000 watt home service @17500v is 400amps its dropped to 120/240 for use in home and is limited to 400amps which only gives you 96000watts(240)/48000watts(120)

[electricians correct me please]

9000 watt dbl oven on 240v is 37.5 amps

480watt light bar at 12v is 40amps

Sometimes you will have a device that will change voltage to get more wattage output with fewer amps.

Amps affect wire size drastically. Amps are the main measure of electrical force/current.

Exactly.. so a 400 watt sound bar should have an amperage of 33+ amps and decent sized wire. But it has smaller wire than I'd expect and a 15 amp inline fuse on it. So clearly it's not drawing what they're implying or I'm misunderstanding what the 400 watt output on a stereo means.

 

[ohanacreek]

Exactly.. so a 400 watt sound bar should have an amperage of 33+ amps and decent sized wire. But it has smaller wire than I'd expect and a 15 amp inline fuse on it. So clearly it's not drawing what they're implying or I'm misunderstanding what the 400 watt output on a stereo means.

Short answer Sound bar probably won't draw more than 10-15 amps. It's a function of the voltage changes within the amp.

wetsounds10

Long answer, get far more complicated depending on amplifier design. There are probably a couple of voltage transformers in that sound bar.

Remember my residential supply example?
You can transmit a lot of electrical power/force long distances, over relatively small cables by upping the voltage considerably. 765,000volts in some cases, then through transformers it gets dropped down at substations and then at the pole or pad mount transformers near your house to 120/240.

Here are a couple of wiki pages that should help. IMO I have a basic understanding of electricity, I'm sure there are some knowledgeable electricians or EEs who can correct me and expand what I've said.

Amplifier - Wikipedia

Audio power - Wikipedia

Electric power transmission - Wikipedia


Electricity can screw you up, and burn stuff down, just ask Polaris and be careful.
I have a friend who has no short term memory after a run in with 3-phase, 600v range power and a co-worker who walked into an electrical room just in time to be involved in another contractors arc flash incident and was burned badly and lost vision in one eye.

 

[Tramguage1]

this is what happened to an opossum thet got into an elevator machine room and got across the 480 volt incoming power, probably fuse it around a hundred amps

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[JTW]

Lol.. yeah, I bet that was a shocking experience!

 

[Tramguage1]

Very stinky too

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[allgm1]

this is what happened to an opossum thet got into an elevator machine room and got across the 480 volt incoming power, probably fuse it around a hundred amps

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that 480 is some bad arse stuff, one leg of that to ground is 277v, trust me it will make your hair stand up straight.