ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
220/230/240V 60Hz Systems
by gfretwell. 09/16/18 12:37 PM
Acronis Backup 2017
by gfretwell. 09/16/18 12:46 AM
Inspection camera help
by Bill Addiss. 09/15/18 11:32 AM
Tingle off the water spigot
by Trumpy. 09/15/18 03:24 AM
Lighting Load questions
by HotLine1. 09/14/18 07:04 PM
New in the Gallery:
Plug terminals
Housebilding DIY wiring
Who's Online Now
0 registered members (), 32 guests, and 23 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Label or the manual #213825
08/02/14 11:48 AM
08/02/14 11:48 AM
G
gfretwell  Offline
OP
Member
Joined: Jul 2004
Posts: 9,287
Estero,Fl,usa
An interesting issue came up over on one of the Usenet groups

There is a Sea Breeze mini split air conditioner that has an installation manual that says it should be connected with 6 gauge copper. The label says "minimum circuit ampacity" is 26 amps. So who do you believe?
The breaker size is 50a.
http://www.irproducts.biz/documents/SB-NewMultiZone.pdf


Greg Fretwell
Work Gear for Electricians and the Trades
Re: Label or the manual [Re: gfretwell] #213826
08/02/14 12:19 PM
08/02/14 12:19 PM
HotLine1  Online Content

Member
Joined: Apr 2002
Posts: 7,024
Brick, NJ USA
Greg:
Well, in the real world....the nameplate wins. I would rarely see an install manual; I would ask for it if I had a question, and hope the HO had it.

They may have sized the branch circuit based on the OCP?



John
Re: Label or the manual [Re: gfretwell] #213827
08/02/14 01:11 PM
08/02/14 01:11 PM
G
gfretwell  Offline
OP
Member
Joined: Jul 2004
Posts: 9,287
Estero,Fl,usa
Quote
They may have sized the branch circuit based on the OCP?



Clearly that is what happened. ... in the 60c column


Greg Fretwell
Re: Label or the manual [Re: gfretwell] #213829
08/03/14 01:57 AM
08/03/14 01:57 AM
Scott35  Offline

Broom Pusher and
Member
Joined: Oct 2000
Posts: 2,708
Anaheim, CA. USA
Curiosity query...

What was the Intensity level of Flames emitted (by the Usenet Members), when the reply Message stating:
"#10 THW Cu. is Adequate and Compliant"
was posted to the Thread???
laugh yay rolleyes bash

--Scott (EE)


Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!
Re: Label or the manual [Re: gfretwell] #213830
08/03/14 02:04 AM
08/03/14 02:04 AM
G
gfretwell  Offline
OP
Member
Joined: Jul 2004
Posts: 9,287
Estero,Fl,usa
One guy in particular still will not let it go.

They are off on a "continuous load" side track now.
I tried to explain that motor circuits already have the 125% of FLA requirement and this would be part of the minimum ampacity calculation.

I explained I would trust the engineer who did that calculation more than a tech writer who might not have English as his first language.


Greg Fretwell
Re: Label or the manual [Re: gfretwell] #213844
08/11/14 08:28 PM
08/11/14 08:28 PM
A
anothermarty  Offline
New Member
Joined: Feb 2006
Posts: 3
MA
Label for outdoor unit only... all the inside coils grab power from the outdoor unit.

Now why its ok to use 14/3 or4 between inside and outside can start another argument smile

Re: Label or the manual [Re: gfretwell] #213845
08/11/14 10:54 PM
08/11/14 10:54 PM
HotLine1  Online Content

Member
Joined: Apr 2002
Posts: 7,024
Brick, NJ USA
Correct me if this is wrong....
The inside unit (fan coil) is fed from the outside unit (condenser) and there is factory OCP for the fan coil feed within the condenser.

Most of the units I have seen have 'factory' wiring from the Cu to the FC.



John
Re: Label or the manual [Re: gfretwell] #213846
08/12/14 01:15 AM
08/12/14 01:15 AM
G
gfretwell  Offline
OP
Member
Joined: Jul 2004
Posts: 9,287
Estero,Fl,usa
I have 2 of these mini splits and one the inside units runs on low voltage that could be run with bell wire Spec'ed as thermostat cable. It is a very small load (a little fan and an electronic board).
The other uses line voltage but just at a few amps.


Greg Fretwell
Re: Label or the manual [Re: gfretwell] #213847
08/12/14 02:06 AM
08/12/14 02:06 AM
A
anothermarty  Offline
New Member
Joined: Feb 2006
Posts: 3
MA
A few amps x 4-5 inside line voltage coils adds up Read the specs 3.5x up to 5 so about 17 amps total inside plus 26 out 50 amps seems right


Re: Label or the manual [Re: gfretwell] #213848
08/12/14 01:01 PM
08/12/14 01:01 PM
G
gfretwell  Offline
OP
Member
Joined: Jul 2004
Posts: 9,287
Estero,Fl,usa
The conductors going to each inside unit only carry the current to that unit. That is why they can be #14.
As for the outside unit, that is specified on the label and you have to trust the engineer who computed it.


Greg Fretwell

Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Admin
Admin
NY, USA
Posts: 3,516
Joined: October 2000
Show All Member Profiles 
Top Posters(30 Days)
Admin 13
Trumpy 11
sparky 10
Popular Topics(Views)
249,289 Are you busy
187,226 Re: Forum
176,586 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.025s Queries: 15 (0.004s) Memory: 1.0129 MB (Peak: 1.1959 MB) Zlib enabled. Server Time: 2018-09-19 20:37:27 UTC