temperature probe

[Bogeygolf]

Need to sense temperature under floor. I put a nonmetalic conduit loop under the floor with pullrope. I will splice leads of bullet probe to wiring. I will then pull probe to desired location underground. This allows me to pull the probe out in the future. Does this break code on splice in conduit?

 

[Smart $]

Need to sense temperature under floor. I put a nonmetalic conduit loop under the floor with pullrope. I will splice leads of bullet probe to wiring. I will then pull probe to desired location underground. This allows me to pull the probe out in the future. Does this break code on splice in conduit?

Don't know. More details required to make a determiantion. In the meantime here are a few related sections:

300.13 Mechanical and Electrical Continuity ? Conductors.

(A) General. Conductors in raceways shall be continuous
between outlets, boxes, devices, and so forth. There shall be
no splice or tap within a raceway unless permitted by 300.15;
368.56(A); 376.56; 378.56; 384.56; 386.56; 388.56; or 390.7.

300.5 Underground Installations.

(B) Wet Locations. The interior of enclosures or raceways
installed underground shall be considered to be a wet location.
Insulated conductors and cables installed in these enclosures
or raceways in underground installations shall be listed for use
in wet locations and shall comply with 310.10(C). Any connections
or splices in an underground installation shall be approved
for wet locations.

(E) Splices and Taps. Direct-buried conductors or cables
shall be permitted to be spliced or tapped without the use of
splice boxes. The splices or taps shall be made in accordance
with 110.14(B).

300.15 Boxes, Conduit Bodies, or Fittings ?Where Required.
A box shall be installed at each outlet and switch
point for concealed knob-and-tube wiring.

Fittings and connectors shall be used only with the specific
wiring methods for which they are designed and listed.

Where the wiring method is conduit, tubing, Type AC
cable, Type MC cable, Type MI cable, nonmetallic-sheathed
cable, or other cables, a box or conduit body shall be installed
at each conductor splice point, outlet point, switch point, junction
point, termination point, or pull point, unless otherwise
permitted in 300.15(A) through (L).

Consult Code for A through L

300.16 Raceway or Cable to Open or Concealed Wiring.

(A) Box, Conduit Body, or Fitting. A box, conduit body,
or terminal fitting having a separately bushed hole for each
conductor shall be used wherever a change is made from
conduit, electrical metallic tubing, electrical nonmetallic
tubing, nonmetallic-sheathed cable, Type AC cable, Type
MC cable, or mineral-insulated, metal-sheathed cable and
surface raceway wiring to open wiring or to concealed
knob-and-tube wiring. A fitting used for this purpose shall
contain no taps or splices and shall not be used at luminaire
outlets. A conduit body used for this purpose shall contain
no taps or splices, unless it complies with 314.16(C)(2).

 

[GoldDigger]

Need to sense temperature under floor. I put a nonmetalic conduit loop under the floor with pullrope. I will splice leads of bullet probe to wiring. I will then pull probe to desired location underground. This allows me to pull the probe out in the future. Does this break code on splice in conduit?

Since the wiring does not actually go from one access box to another, the whole thing is somewhat problematic.

Conductors in raceways shall be continuous
between outlets, boxes, devices, and so forth.

I assume that this is actually instrumentation leads and not power wiring, and class 3 or lower limited power? Does that affect the applicability of that section?

Is the attachment of an end point device to its connecting cable a splice in the code sense?
Would the alternative be to find a temperature sensor with 20 foot leads attached? Not likely.....

 

[jumper]

725.3 Other Articles. Circuits and equipment shall comply
with the articles or sections listed in 725.3(A) through
(J). Only those sections of Article 300 referenced in this
article shall apply to Class 1, Class 2, and Class 3 circuits.

A conduit probe is probably a thermister or such.

 

[Smart $]

...
I assume that this is actually instrumentation leads and not power wiring, and class 3 or lower limited power? Does that affect the applicability of that section?

725.46 Class 1 wiring methods Article 300 Part I.

725.130 paraphrased, Class 2 and 3 load side of power supply can use either Class 1 wiring methods or the sections that follow. Of the latter, there are no requirements for splices.

Is the attachment of an end point device to its connecting cable a splice in the code sense?...

IMO, if it has wire leads, yes.