Indoor unit
- Thread starter codequestion
- Start date
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MAC702
Senior Member
- Location
- Clark County, NV
At my level, the cost difference is negligible, and I haven't even run the numbers to see which is cheaper. I prefer a cord-and-plug for reliability and I like to see the plug sitting in front of me while I'm working on a machine, especially when diagnostics will have you connecting and disconnecting several times. Same reason I prefer a pull-out instead of a switch-type disconnect at the unit outside. I set the pull-out physically on top of the machine. It also helps me remember to turn the machine on before I leave. I've never made that mistake... :lol: :ashamed:
I'm not going to address the OP's only recently-revealed 25A "engineered" circuit. He's an electrical engineer. I should be asking him how to do it.
FWIW, the cords I see and use on these are not homemade SO cords. They are appliance whips with molded plugs.
- Occupation
- Licensed Electrician
Well that is a bad idea.
- Location
- Placerville, CA, USA
- Occupation
- Retired PV System Designer
And a code violation to boot!
The MOCP is not a recommendation; it is a listing requirement enforceable by the NEC.
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- Location
- Connecticut
- Occupation
- Engineer
I don't see this as a code violation. The Goodman manual calls the MOCP the maximum "RECOMMENDED" fuse or circuit breaker size.
It further states to size wires and fuses properly in accordance with the NEC. It doesn't appear to be a listing requirement to me.
And why would you want to take responsibility for oversizing the overcurrent projection recommended by the manufacturer?
To me, if you do, you've just voided all warranties should problems arise by doing so.
JAP>
- Location
- Connecticut
- Occupation
- Engineer
Putting a 25 amp rated overcurrent device ahead of something that recommends 15 doesn't seem to me to be installing the unit per the instructions.
JAP>
- Location
- Connecticut
- Occupation
- Engineer
CYA is all that is.
To me although maybe not a code violation by doing otherwise, you're always better off to follow the Manufacturers recommendation.
If the wiring in the unit were to fry for some unknown reason and cause damage , I'd have a stiffer leg to stand on if the investigator found it was protected by the recommended OCPD rather than 10 amps above the recommendation , where I wouldn't stand a chance.
JAP>
Mgraw
Senior Member
- Location
- Opelousas, Louisiana
- Occupation
- Electrician
I disagree. From the installation instructions:
"Use a separate fused branch electrical circuit containing properly sized wire, and fuse or circuit breaker. The fuse or circuit breaker must be sized in accordance with the maximum overcurrent protection specified on the unit rating plate. An electrical disconnect must be provided at the furnace location."
kwired
Electron manager
- Location
- NE Nebraska
- Occupation
- EC
Off topic a little but a good example - what is purpose of requiring semiconductor fuses in the supply circuit of VFD's besides complying with instructions?
In such application if motor is drawing too much current drive protects itself and shuts down. If a front end component of the drive shorts out - it is toast whether you had a semiconductor fuse installed or not. Some fuses may reduce how spectacular that failure may be, but is still toast.
To sell more expensive fuses.
MAC702
Senior Member
- Location
- Clark County, NV
Hmmmm, who do I pay to make my AFCI fuses mandatory?
codequestion
Banned
- Location
- MD, USA
Do soft start prevent voltage drop due to voltage drop from long distance cable run?
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Your right, that is way off topic.
More like riiiiinnnnggggg... hello....I need you to get over here...fire marshall is here and found the cause of what burnt my house down is the wiring inside my furnace you just wired for me the other day....me ... sorry ... that's not my problem... I wired it per code......that maybe but we already called the furnace manufacturer and they aren't taking responsibility for the fire....we told them yes they were because the fire started in the faulty wiring in the unit they sold us and we were going to sue their pants off.....they then asked us what size OCPD the installing electrician put in and the fire Marshall found that you put in a 25 amp breaker instead of the 15 amp they recommended so now they're blaming you because you put in a breaker larger than what they recommended...and I'm now going to sue your pants off...me... click...dddduuuuuhhhhhhhhhhhhhh....
Mgraw
Senior Member
- Location
- Opelousas, Louisiana
- Occupation
- Electrician
kwired
Electron manager
- Location
- NE Nebraska
- Occupation
- EC
One can replace furnace in your little story with VFD and 25 amp breaker with semiconductor fuse and leave the rest of the wording as is and you are telling almost same story just with different equipment involved.
Not sure if you are absolutely serious or joking?
It will lower overall voltage drop on the branch circuit during starting because it limits current, but motor still sees reduced voltage during starting.
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