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Old 01-02-2012, 05:20 PM   #1
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need advise


a couple of years ago I bought a 110 spa that's rated at 15 amps. however the installation instructions recommended using a 20 amp dedicated circuit. I was out of spots for breakers in the panel so I bought a quad breaker (2- 30s and 2-20s) and replaced the dual 30 being used for the dryer.
Now I would like to install a ceiling fan in the living room and face the same problem. I have one more dual 30 breaker for my AC unit and could replace it with another quad breaker.
My panel I think is a 200 amp because the service disconnect breaker is a dual 100.
In your opinion would this be safe to do?
I will attach a photo of my panel.
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Old 01-02-2012, 05:33 PM   #2
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need advise


Quote:
Originally Posted by Merlyn View Post
My panel I think is a 200 amp
out of spots for breakers in the panel
bought a quad breaker
replaced the dual 30
one more dual 30
could replace it with another quad breaker.

In your opinion would this be safe to do?
In my opinion... you need another (larger) panel or a sub panel.
Looking at the house as a whole unit... is there a concentration of power users
(HVAC, Dryer, Water Heater, Range) in one area of the house?


hth

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Old 01-02-2012, 05:52 PM   #3
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Could you not tie into an existing circuit, the fan shouldn't require to much power.

What ended up on the other 20A of your quad breaker.
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Old 01-02-2012, 06:06 PM   #4
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It's very likely that is a 100 amp service.
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Old 01-02-2012, 06:09 PM   #5
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need advise


You have a 100 amp service. You do not add the the two handles together. The double 100 amp breaker means you have 100 amp service.
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Old 01-02-2012, 07:04 PM   #6
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Ceiling fans are very low wattage. Like 100 watts or like a table lamp.

No need for additional circuits. Look at the wattage on the box.
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Old 01-02-2012, 11:04 PM   #7
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You have what's known as a split bus panel. The main breaker and the breakers above are all connected to the supply bus and the service entrance cable to your meter. This type of panel is considered less safe since there is generally no breaker protecting the service entrance cable from over current. In your case you have the *potential* of 240 amps being drawn through the meter. The actual load may be significantly less, but you have no way to be certain.

You need to look at the service entrance cable to determine the actual maximum rated capacity of the cable. If the service entrance cable is sized for the 100 amp main breaker you should definately be looking at upgrading the panel. Do you have a seperate main breaker at the meter?

To clarify, joined breakers are for 240v loads, like your main. You have 100 amp 240v main breaker, which is equal to 200 amps at 120v, assuming it could be perfectly balanced across both 120v legs.

http://www.armstrongssupply.com/wire_chart.htm

** 3-Wire residential services, allowable ampacities
Copper AWG Aluminum AWG Service Ampacity
4 1 100
3 1 110
2 1/0 125
1 2/0 150
1/0 3/0 172
2/0 4/0 200
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Old 01-03-2012, 12:21 AM   #8
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You said you replaced your dryer with a quadplex are you sure because it should have been a triplex so the 2 20 amp lines don't have an internal trip.

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