ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
110.26
by gfretwell. 02/18/18 12:14 AM
2018 Code Explained
by Potseal. 02/14/18 03:16 PM
Air Compressor feeder conductor sizing
by Potseal. 02/14/18 03:11 PM
New in the Gallery:
Housebilding DIY wiring
SE cable question
Who's Online Now
0 registered members (), 9 guests, and 8 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Page 1 of 2 1 2
Supported fittings #210285
06/07/13 05:12 PM
06/07/13 05:12 PM
akmaster  Offline OP
Member
Joined: Jun 2012
Posts: 70
alaska
Here is a question that is probably been changed since I looked it up but if I have a 2" T, do I not have to come out with at least two trade size conduits unless the fitting is supported? I am thinking it is required that there be at least two trade size conduits exiting or the fitting had to be supported...I have a 2" T with two 1-1/2" and a 2" connected to the T.

Please quote article if possible.

thanks very much,

Greg

Last edited by akmaster; 06/07/13 05:24 PM.

Don't drive and TEXT! Drive now TALK LATER!
2017 / 2014 NEC & Related Books and Study Guides
Re: Supported fittings [Re: akmaster] #210289
06/07/13 09:08 PM
06/07/13 09:08 PM
HotLine1  Offline

Member
Joined: Apr 2002
Posts: 6,926
Brick, NJ USA
Ak:
Try this from 2011, 314.23-(E)

"(E) Raceway Supported Enclosure, Without Devices,
Luminaires, or Lampholders. An enclosure that does not
contain a device(s) other than splicing devices or support a
luminaire(s), lampholder, or other equipment and is supported
by entering raceways shall not exceed 1650 cm3
(100 in.3) in size. It shall have threaded entries or have
hubs identified for the purpose. It shall be supported by two
or more conduits threaded wrenchtight into the enclosure or
hubs. Each conduit shall be secured within 900 mm (3 ft) of
the enclosure, or within 450 mm (18 in.) of the enclosure if
all conduit entries are on the same side.

Exception: The following wiring methods shall be permitted
to support a conduit body of any size, including a conduit
body constructed with only one conduit entry, if the
trade size of the conduit body is not larger than the largest trade size of the conduit or tubing:
(1) Intermediate metal conduit, Type IMC
(2) Rigid metal conduit, Type RMC
(3) Rigid polyvinyl chloride conduit, Type PVC
(4) Reinforced thermosetting resin conduit, Type RTRC
(5) Electrical metallic tubing, Type EMT


John
Re: Supported fittings [Re: HotLine1] #210291
06/08/13 10:15 AM
06/08/13 10:15 AM
akmaster  Offline OP
Member
Joined: Jun 2012
Posts: 70
alaska
Thanks John,
This is what I was looking for. I am interpreting this as meaning that the fitting is considered supported as long as ALL conduits are the same trade size as the fitting..

So no RE's...I.E. 2" T with one 2" and two 1" conduits unless it is supported within 3'?

Thanks

Greg


Don't drive and TEXT! Drive now TALK LATER!
Re: Supported fittings [Re: akmaster] #210323
06/10/13 06:59 PM
06/10/13 06:59 PM
akmaster  Offline OP
Member
Joined: Jun 2012
Posts: 70
alaska
Hi,
I am asking for a little clarification on 314.23-(E)...

Is this saying that only ONE conduit must be trade size?

I have a 2" T with a 2" RGS coming into the T and 3/4" and 1" conduits leaving the other two entries...

This article used to say at least two conduits had to be trade size...

Can someone clarify what is legal?

It seems to read that any conduit must be trade size of the fitting..

Thanks for your help.

regards

Greg


Don't drive and TEXT! Drive now TALK LATER!
Re: Supported fittings [Re: akmaster] #210324
06/10/13 09:55 PM
06/10/13 09:55 PM
G
gfretwell  Offline

Member
Joined: Jul 2004
Posts: 9,180
Estero,Fl,usa
The easy answer is support it within 3' on either side of the conduit body (<100 cu/in) and it doesn't matter.

The exception allows you to virtually ignore the conduit body if it is the same as the raceway size and the raceway is supported properly. It is just a bump in the pipe that requires no special support.
As soon as you start hanging devices you are moving down to (F) and you need support at 18" from both sides or 12" if it is one pipe (d).


Greg Fretwell
Re: Supported fittings [Re: akmaster] #210327
06/11/13 10:18 AM
06/11/13 10:18 AM
akmaster  Offline OP
Member
Joined: Jun 2012
Posts: 70
alaska
Thanks Greg,
I understand your first sentence but the second is still bugging me..

If supported within 3' you can use any size conduit?

Thanks again...sorry for being hard headed!

regards,

Greg

Last edited by akmaster; 06/11/13 10:22 AM.

Don't drive and TEXT! Drive now TALK LATER!
Re: Supported fittings [Re: akmaster] #210329
06/11/13 11:48 AM
06/11/13 11:48 AM
G
gfretwell  Offline

Member
Joined: Jul 2004
Posts: 9,180
Estero,Fl,usa
Let's look at it again.

Quote
(E) Raceway Supported Enclosure, Without Devices,
Luminaires, or Lampholders. An enclosure that does not
contain a device(s) other than splicing devices or support a
luminaire(s), lampholder, or other equipment and is supported
by entering raceways shall not exceed 1650 cm3
(100 in.3) in size. It shall have threaded entries or have
hubs identified for the purpose. It shall be supported by two
or more conduits threaded wrenchtight into the enclosure or
hubs. Each conduit shall be secured within 900 mm (3 ft) of
the enclosure, or within 450 mm (18 in.) of the enclosure if
all conduit entries are on the same side.


The base article does not say "conduit body" at all so there is no "size" defined beyond "<100 cu/in".
This means it could be a Bell box if that was what you wanted to use and you could still support at it 3" from both sides or 18" if both conduits come from the same side.

It is when you get down to the exception for conduit bodies that the conduit size comes in.

Quote

Exception: The following wiring methods shall be permitted
to support a conduit body of any size, including a conduit
body constructed with only one conduit entry, if the
trade size of the conduit body is not larger than the largest
trade size of the conduit or tubing:
(1) Intermediate metal conduit, Type IMC
(2) Rigid metal conduit, Type RMC
(3) Rigid polyvinyl chloride conduit, Type PVC
(4) Reinforced thermosetting resin conduit, Type RTRC
(5) Electrical metallic tubing, Type EMT


Greg Fretwell
Re: Supported fittings [Re: akmaster] #210330
06/11/13 12:07 PM
06/11/13 12:07 PM
G
gfretwell  Offline

Member
Joined: Jul 2004
Posts: 9,180
Estero,Fl,usa
There is one interesting ramification. The article does not say solvent welded so you might argue you could not use a PVC "glue in" enclosure that wasn't a conduit body unless it was otherwise supported. If you had a threaded entry box with male adapters on the PVC it would be legal according to the way the code is written.

Look for a proposal there.

The other significant thing is the conduit body exception removes the 100 cu/in restriction.
A 6" conduit body will exceed 100 cu/in but it can still be supported by 6" conduits at normal support intervals. You just can't use smaller conduits for support.


Greg Fretwell
Re: Supported fittings [Re: akmaster] #210331
06/11/13 01:26 PM
06/11/13 01:26 PM
akmaster  Offline OP
Member
Joined: Jun 2012
Posts: 70
alaska
OK Greg...thanks for the clarification... so say I have an FS box with an outlet in it..a 3/4 rigid from the top and 3/4 from the bottom...box is in free air..conduits threaded in and one hole strap within 3' of FS box...does the box need to be supported or is it considered supported by the conduits?



Don't drive and TEXT! Drive now TALK LATER!
Re: Supported fittings [Re: akmaster] #210332
06/11/13 02:00 PM
06/11/13 02:00 PM
G
gfretwell  Offline

Member
Joined: Jul 2004
Posts: 9,180
Estero,Fl,usa
OK you changed the game a little when you put a device (other than a splice) in the enclosure.
Now you are in 314.23(F).
Your support, on both sides, now needs to be 18" or less.

Quote
(F) Raceway-Supported Enclosures, with Devices, Luminaires,
or Lampholders. An enclosure that contains a
device(s), other than splicing devices, or supports a luminaire(
s), lampholder, or other equipment and is supported by
entering raceways shall not exceed 1650 cm3 (100 in.3) in
size. It shall have threaded entries or have hubs identified for
the purpose. It shall be supported by two or more conduits
threaded wrenchtight into the enclosure or hubs. Each conduit
shall be secured within 450 mm (18 in.) of the enclosure.


I still would be more picky if you were talking about a receptacle. That box better not move when I grabbed it and gave it a twist.



Greg Fretwell
Page 1 of 2 1 2

Featured:

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

 

Member Spotlight
HCE727
HCE727
Delaware County, PA, USA
Posts: 186
Joined: November 2005
Show All Member Profiles 
Top Posters(30 Days)
Admin 9
Popular Topics(Views)
244,028 Are you busy
181,022 Re: Forum
171,266 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.024s Queries: 16 (0.005s) Memory: 1.0294 MB (Peak: 1.2138 MB) Zlib enabled. Server Time: 2018-02-20 13:19:16 UTC