question??? / RHW - IMC Fill

[jusme123]

08 code
# 12 wire, type RHW-2 without outer covering, fixture wire. how many can fit in a 3/4" intermediate metal conduit (IMC).

a. 12
b. 8
c. 6
d. 9

 

[chris kennedy]

RHW-2 is not a fixture wire.

 

[LEO2854]

08 code
# 12 wire, type RHW-2 without outer covering, fixture wire. how many can fit in a 3/4" intermediate metal conduit (IMC).

a. 12
b. 8
c. 6:grin:
d. 9

type RHW-2 without outer covering, fixture wire does not appere in article 402.3 Fixture wires. what do you mean by type RHW-2 "without outer covering"

6 #12 RHW-2 can fit in a 3/4 (IMC)Page 70-719

 

[chris kennedy]

type RHW-2 without outer covering, fixture wire does not appere in article 402.3 Fixture wires. what do you mean by type RHW-2 "without outer covering"

6 #12 RHW-2 can fit in a 3/4 (IMC)Page 70-719

9 without covering, see notes pg 70-722.

 

[iwire]

10 .........................

 

[chris kennedy]

10 .........................

.0260in.??10=.260

?IMC@40%=.235

How do you figure 10 Bob, little extra soap?

 

[iwire]

.0260in.??10=.260

?IMC@40%=.235

How do you figure 10 Bob, little extra soap?

I used the figure for 1" IMC not 3/4"

That being the case I revise my answer to 6.

3/4" IMC 0.235

12 RHW 0.0353

.235/.0353=6.657

 

[augie47]

I'd have to go with Chris on RHW-2 WITHOUT outer covering..... 9

 

[iwire]

Using the 2008 NEC looking at Table 5 on page 70-676.

RHW-2* = 0.0353

At the bottom of Table 5 on page 70-679 it tells us

*Types RHH, RHW, and RHW-2 without outer covering.

Page 70-722 is in Annex C and is not part of the code.

 

[cadpoint]

Box of Rocks here, to lazy to get da book from da car!

I thought the last letter, in this case "W" was for only the outside jacket covering the inside insulated wire, thus making it a poorly written question; reflecting poor use of these wires in a real world application.

:roll:, What do I know... only First COC...

 

[chris kennedy]

At the bottom of Table 5 on page 70-679 it tells us

*Types RHH, RHW, and RHW-2 without outer covering.

Right, so RHW-2*=.0260.

 

[iwire]

Right, so RHW-2*=.0260.

I am not following you Chris, where are you getting .0260?

 

[augie47]

Bob,
Am I mistaken that on pg 676 that although the heading has the *, the RHW-2 does not, however, on pg. 677 the THW-2 is followed by the * and on 677 the area is 0.260

 

[iwire]

I am not following you Chris, where are you getting .0260?

Never mind, I see it now.

Thanks

 

[iwire]

Bob,
Am I mistaken that on pg 676 that although the heading has the *, the RHW-2 does not, however, on pg. 677 the THW-2 is followed by the * and on 677 the area is 0.260

I screwed up and went by the heading not the subsections.

 

[don_resqcapt19]

Box of Rocks here, to lazy to get da book from da car!

I thought the last letter, in this case "W" was for only the outside jacket covering the inside insulated wire, thus making it a poorly written question; reflecting poor use of these wires in a real world application.

:roll:, What do I know... only First COC...

The "W" is for a conductor that can be used in a wet location. It is not for the type of jacket.
The "R" is for thermoset (rubber) insulation, the H is for 75?C insulation (the addition of the -2 at the end of this insulation type says that it is a 90?C insulation, often 90?C is designated by "HH").

 

[LEO2854]

9 without covering, see notes pg 70-722.

Thanks Chris 9 #12s table c.4 page 70-719

 

[cadpoint]

The "W" is for a conductor that can be used in a wet location. It is not for the type of jacket.
The "R" is for thermoset (rubber) insulation, the H is for 75?C insulation (the addition of the -2 at the end of this insulation type says that it is a 90?C insulation, often 90?C is designated by "HH").

Thanks Don ! I did search for "Lettering" before I made my statement, an I do appreciate the insight!

 

[LarryFine]

... the addition of the -2 at the end of this insulation type says that it is a 90?C insulation, often 90?C is designated by "HH" ...

I thought the -2 suffix meant the dry temperature rating also applies in wet applications.

 

[jumper]

I thought the -2 suffix meant the dry temperature rating also applies in wet applications.

A quick glance at T310.13 seems to support this. 90 degrees in either.