ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Potseal 11
Recent Posts
1913 American Electrician's Handbook
by annemarie1. 07/27/17 03:10 PM
600 KW 120/208 3 Phase Y protection
by Yooperup. 07/24/17 12:20 PM
Green House wiring
by ghost307. 07/20/17 09:10 AM
Permit Snafus...AHJs and Contractors Jump in
by HotLine1. 07/18/17 08:06 PM
New in the Gallery:
Housebilding DIY wiring
Popular Topics(Views)
239,365 Are you busy
174,822 Re: Forum
167,212 Need opinion
Who's Online Now
0 registered members (), 62 guests, and 4 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
Page 1 of 2 1 2
#104813 - 11/16/03 09:24 AM AC Unit Installed on Roof Top  
Joe Tedesco  Offline
Joined: Oct 2000
Posts: 2,749
Boston, Massachusetts USA
I don't think that this work was done by an electrician, and it looks like there may have been no permit secured or the benefit of an inspection here in Boston on North street!

What about the vent here? Anything to discuss concerning the proximity to the unit?

[Linked Image]

Joe Tedesco, NEC Consultant

2017 / 2014 NEC & Related Books and Study Guides

#104814 - 11/16/03 09:28 PM Re: AC Unit Installed on Roof Top  
electricman2  Offline
Joined: Nov 2003
Posts: 269
Thomasville, NC USA
Is that white box the disconnect?. Also,wonder why he left all that flex coiled up?


#104815 - 11/16/03 09:50 PM Re: AC Unit Installed on Roof Top  
crash  Offline
Joined: Oct 2003
Posts: 147
Calgary Canada
It is the disconnect, some of the weather-proof enclosures (for this purpose), that I have seen have tiny drain holes in the bottom and are constructed so water will not enter the top, but will drain out the bottom. Laying the enclosure on its side defeats this. Not to mention other code issues. But I don't think the disconnect and flex are the big danger here.

#104816 - 11/17/03 05:17 AM Re: AC Unit Installed on Roof Top  
Big Jim  Offline
Joined: Jul 2003
Posts: 394
Denver, CO USA
The unit is a heat exchanger, there is no transfer of air into the building. I don't think the proximity of the vents is a problem except possibly the combustion vent could be hot and pose a hazard to the service person.

#104817 - 11/17/03 06:16 AM Re: AC Unit Installed on Roof Top  
ThinkGood  Offline
Joined: Aug 2002
Posts: 1,081
Milwaukee, WI
Could that be a sewer line vent? Stinky...

(Or is that vent part of the HVAC system?Still, it seems too close to the unit.)

[This message has been edited by ThinkGood (edited 11-17-2003).]

#104818 - 11/17/03 10:22 AM Re: AC Unit Installed on Roof Top  
seeks  Offline
Joined: May 2002
Posts: 25
bufalo, ny 14228
There should be a receptacle within 25 feet for maintenence persons to plug in to.


#104819 - 11/17/03 12:11 PM Re: AC Unit Installed on Roof Top  
ThinkGood  Offline
Joined: Aug 2002
Posts: 1,081
Milwaukee, WI
Is the puddle from condensation or from rain? How deep can the water get? Should the unit be raised up on blocks?

#104820 - 11/18/03 09:11 PM Re: AC Unit Installed on Roof Top  
John Steinke  Offline
Joined: Apr 2001
Posts: 518
Reno,Nv., USA
The vent loks like the sort used to vent a gas water heater, space heater, etc. As such, it may include an inner sleeve for "out" and an outer sleeve for "fresh air in."

That coiled flex and "Bell" box look to be some design to allow the equipment to be operated fron some distance away. Is there another unit nearby that might work together with this one, and for which a serviceman might want to control from one point?

#104821 - 01/03/04 03:14 PM Re: AC Unit Installed on Roof Top  
Steve Wiggins  Offline
Junior Member
Joined: Jan 2004
Posts: 2
Waco, Tx
The elect whips come extra long and coiled up like that. It saves an extra step by not cutting it to length. The disconnect box was probably mounted on the unit at one time but the service person had to remove it to gain access to the controls.

Vent pipe is not a problem.

Obviously the owner doesn't care because there was no permit pulled and the equipment looks like a cheap piece of scratch & dent. A lot of rental apartments are this way and worse. But see the employees of the property managers are exempt from regulation in most states [Linked Image]

#104822 - 01/20/04 09:02 AM Re: AC Unit Installed on Roof Top  
electure  Offline

Joined: Dec 2000
Posts: 4,260
Fullerton, CA USA
This unit looks like it was just thrown on the roof. It should sitting atop a structural member that will hold the additional weight.
The Liquidtite, as in any other conduit, can't have >360° of bend between pull points, much less remain coiled.
(We actually know a guy that lives on North Street in Boston [Linked Image] I can't imagine him letting this remain in his neighborhood!)...S

Page 1 of 2 1 2

Member Spotlight
dallas, texas, USA
Posts: 67
Joined: January 2002
Show All Member Profiles 

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


Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.017s Queries: 15 (0.003s) Memory: 0.8178 MB (Peak: 0.9930 MB) Zlib enabled. Server Time: 2017-07-27 22:42:23 UTC