A/C Breaker size

[Greg Fretwell]

I can see this going both waysCertainly 240.4(B) would make this OK with nothing else considered but you run up against 110.3(B). The label does say 58a Max.

[rgallahorn]

??

(C) Protective Device Rating Not to Exceed the Manufacturer's Values. Where maximum protective device ratings shown on a manufacturer's overload relay table for use with a motor controller are less than the rating or setting selected in accordance with 440.22(A) and (B), the protective device rating shall not exceed the manufacturer's values marked on the equipment.

[Paul W. Abernathy]

Originally Posted by Greg Fretwell

I can see this going both waysCertainly 240.4(B) would make this OK with nothing else considered but you run up against 110.3(B). The label does say 58a Max.

AHHHH...but does it...lol.......how about some pictures of this phantom "DATA PLATE"...lol

[Paul W. Abernathy]

Originally Posted by rgallahorn

??

(C) Protective Device Rating Not to Exceed the Manufacturer's Values. Where maximum protective device ratings shown on a manufacturer's overload relay table for use with a motor controller are less than the rating or setting selected in accordance with 440.22(A) and (B), the protective device rating shall not exceed the manufacturer's values marked on the equipment.

To be quite honest with you....I have never seen a Manufacturer give a value that is not a standard listed value in regards to the OCPD.....remember now you are mingling OCPD's and Overload Relays in those statements...so I will assume you are just refering to the last portion.

It is important to know as greg stated that in many cases the breaker is " Increased " for specific reasons.....again I do not recall ever seeing a rating of an HVAC unit which I believe is in question here as 58A....may be the plates data for the amp draw......which then would make the "increasing" the size OCPD apply.....Now...if we are talking about multiple motors and a feeders OCPD..then that can't be increased per the NEC...so it would be a case of downsizing the breaker....but thats too much information.

[rgallahorn]

Paul,
Frequently I see data plates that have a labeled max and min allowing a range.

[Speedy Petey]

Originally Posted by rgallahorn

Paul,
Frequently I see data plates that have a labeled max and min allowing a range.

Paul's comment was that when it is stated "Max fuse or circuit breaker", it is ALWAYS a common fuse or breaker size.
When the "Minimum circuit ampacity" is listed it is the actual circuit ampacity.

I have never seen different in the hundreds of A/C units I have wired.

[David Nice]

Originally Posted by pabernathy

AHHHH...but does it...lol.......how about some pictures of this phantom "DATA PLATE"...lol

For obvious reasons I don't take pictures of data plates, but I read them with a magnifying glass. It did indeed read 58 amps for MAX breaker size.

[Michael Larson]

Originally Posted by dnice

For obvious reasons I don't take pictures of data plates, ...

Not obvious to me, why?

[David Nice]

Originally Posted by mlarson

Not obvious to me, why?

Data Plate facing house. No room for a camera, which is often the case.

[Michael Larson]

Originally Posted by dnice

Data Plate facing house. No room for a camera, which is often the case.

I use a macro setting that focuses to less than 10 in. from the lense. Canon S2

[Paul W. Abernathy]

Originally Posted by rgallahorn

Paul,
Frequently I see data plates that have a labeled max and min allowing a range.

Not what I am speaking of....the Max and Min refer to two different things...Minimum Ampacity and Maximum OCPD ( or fuse )...two different things.

[Paul W. Abernathy]

Originally Posted by dnice

For obvious reasons I don't take pictures of data plates, but I read them with a magnifying glass. It did indeed read 58 amps for MAX breaker size.

David,

Not for me to say the obvious...but I take pictures of them all the time and with my 5.0 megapixel camera I have no problem reading them and it is just nice to keep with the records in case you are going back to the office and possible looking up additional info...life manufacturers numbers and so on...

But then again....I am not doubting you fella....only giving education as it is not my inspection...

[Roy D. Cooke, Sr]

Originally Posted by pabernathy

David,

Not for me to say the obvious...but I take pictures of them all the time and with my 5.0 megapixel camera I have no problem reading them and it is just nice to keep with the records in case you are going back to the office and possible looking up additional info...life manufacturers numbers and so on...

But then again....I am not doubting you fella....only giving education as it is not my inspection...

I do also take pictures mainly for my use and protection .
I get places where I can not read the oil tank or AC.
My $99:00 kodiac will go as close as 4 inches and I can blow that picture up on the Camera to confirm I have the info I need .
Liked it so much bought a spare holds 985 pictures so I can take pictures of every thing does a great job.
... Cookie

[Paul W. Abernathy]

Cool Roy....I just dont want David to think I was rippin him..I was not David. I was only saying ( in my way ) that it is very hard for someone like me or speedy to give comments on it because we see ALOT of them and in regards to dwellings I am simply not used to seeing anything that says 58A only.....chances are if it is real old....report it as beyond its life and move on....otherwise all I was saying is it is very strange to see a nameplate for an HVAC unit that does not have a Min Amp and Max OCPD rating listed on the plate...thats all.

[Richard L. Bennett]

I would make a quick call to Carrier

Here is how I read it

Max BKR does not say max current. Come down one standard size if stated current will be with in the bkr limits

What I see the Carrier doing is saying under their breath is do not use a 60 amp bkr

Sure would like to see how this one works out

rlb