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Two circuits in panel inoperative

I just installed a new QOC20U100F panel & the power surges (lights flicker) with the breaker in #7 & #19. When I move the breaker (hot attached) to any other location it works fine. Does this mean the panel is defective? Thanks

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  • davesyellow8 Dec 09, 2008

    Thank you for the quick response! I'll follow your advice as I'm sure you're right. That was my first thought also & spent a couple hours working back to the panel.

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Not likely check the neutrals on those circuits the chance that 7&19 are bad and everthing in between is good is almost impossible. i would check the wires very close and also inspect the neutral buss connections both main connections and circuit connections

Posted on Dec 09, 2008

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I'd be on the hunt for a burned fuse I could replace, on those two circuit panels. If no fuse(s) can be found, I would be sad to think the circuit board itself got fried, and new ones can be goofy expensive, so here's to you finding a burned fuse!!

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I have a Proform 625 treadmill that I had to move. I unplugged the unit, slid it to where I needed it to go and plugged it back in. When I did so, the console powers on, but the display flickers and the...


You can try the following:
a. Make sure that the power cord is plugged into a surge suppressor, and that the surge suppressor
is plugged into a properly grounded outlet (see page 9). Use only a single-outlet surge suppressor
that meets all of the specifications described on page 9. Important: The treadmill is not compatible
with GFCI-equipped outlets.
b. After the power cord has been plugged in, make sure that the key is fully inserted into the console.
c. Check the circuit breaker located on the treadmill
near the power cord. If the switch protrudes as
shown, the circuit breaker has tripped. To reset the
circuit breaker, wait for five minutes and then press
the switch back in.
d. Check the on/off switch located on the treadmill near
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1 Answer

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First the part number QOC20U100F is a flush mount panel cover. The panel you have is most likely a :QO116M100. No you cannot replace the breaker as the bus in the panel is only rated for 100A. In addition I believe this is a 20CKT panel. If you're gonig to a 200A service you'd probably want more spaces than that. Home Depot and Lowes both carry 200A panels with starter set of breakers at reasonable price. The QO panels are a bit better than the Homeline
Here is a link to manual for their panels. :
http://static.schneider-electric.us/assets/DIGEST/load-centers.pdf

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1 Answer

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Fuses, Switches, Circuit Breakers And Relays Most vehicles use one or more fuse panels. This one is located on the driver’s side kick panel tcca6p01.jpg

It is possible for large surges of current to pass through the electrical system of your vehicle. If this surge of current were to reach the load in the circuit, this surge could burn it out or cause severe damage to the vehicle’s electrical system. It can overload the wiring, causing the harness to get hot and melt the insulation. To protect vehicle wiring, fuses, circuit breakers and/or fusible links are typically installed into the power supply wires throughout the electrical system. These items are nothing more than a built-in weak spot in the system. When an excessive amount of current flows through a circuit it causes an increase in heat throughout the wiring. Fuses and circuit breakers are designed as the weak link in the system and will disconnect the circuit to prevent damage to the components contained within that circuit. Components are equipped with connectors so they may be replaced in situations where they were damaged due to a power surge.
The following are descriptions as to how fuses and circuit breakers protect the electrical system:
  • Fuse- A fuse is a weak link in the system designed to create an open circuit when the amperage flowing through that circuit exceeds the limits of the fuse. As the amperage increases, the conductor within the fuse heats up and eventually melts and breaks apart. This open circuit interrupts the flow of current and protects the components in the circuit.
  • Circuit Breaker- A circuit breaker is a "self-repairing" fuse. It will open the circuit in the same fashion as a fuse. The surge creates heat the same way that a fuse is affected. When the surge subsides and the circuit cools down, the circuit breaker will reset and allow current to flow through the circuit. Typically circuit breakers do not need to be replaced.
  • Fusible Link- A fusible link (fuse link or main link) is a short length of special, high temperature insulated wire that acts as a fuse. When an excessive electrical current passes through a fusible link, the thin gauge wire inside the link melts, creating an open to protect the circuit. To repair the circuit, the link must be replaced. Some newer type fusible links are housed in plug-in modules, which are simply replaced like a fuse, while older type fusible links must be cut and spliced if they melt
CAUTION
Always replace fuses, circuit breakers and fusible links with identically rated components. Under no circumstances should a protection device of higher or lower amperage rating be substituted.
---
I would get a fuse tester that can test fuses while still installed and powered up. It will light if the fuse is blown when applied to the two tabs that are exposed on fuses that are installed in your Ford product.

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