Expansion Fittings accommodate for conduit thermal expansion and contraction to compensate for length changes due to temperature variations in exposed conduit runs. Expansion joints are required when the temperature change is greater than 25°F (14°C).
What are the features of expansion fittings?
EXPANSION FITTINGS FEATURES-SPECIFICATIONS LISTED – File E22699 Applications TAF Series Expansion Fittings compensate for linear movement between two conduit joints in runs of EMT (electrical magnetic tubing) conduit. This series provides up to a maximum 4” conduit movement (2” in either direction).
What are Taf expansion fittings?
Applications TAF Series Expansion Fittings compensate for linear movement between two conduit joints in runs of EMT (electrical magnetic tubing) conduit. This series provides up to a maximum 4” conduit movement (2” in either direction).
What is an AF8 expansion fitting used for?
Applications AF/AF8 Series Expansion Fittings are for use with IMC or rigid conduit installations. The AF/AF8 Series prevents damage of the electrical installations typically used in buildings and bridges by compensating linear movement due to temperature fluctuation or structural movement.
How much conduit do I need for expansion fittings?
This series provides up to a maximum 4” and 8” conduit movement (2” and 4” in either direction). For applications involving IMC, a 15” minimum length of rigid conduit should be used entering the expansion fitting due to the slightly smaller O.D. of the IMC.
What is expansion fitting?
What is PEX fitting made of?
Can you replace Uponor fittings?
What is the purpose of expansion couplings?
Expansion couplings are used mainly to connect two pieces of pipe together.
When should I use conduit expansion fittings?
Expansion fittings are usually used where the straight run length is greater than 25 feet and expected temperature change is greater than 60°F. Rigid PVC conduit has a coefficient of expansion of 3.38 x 10-5 in./in./°F. A 10 foot length will change in length about 3/8" with a change in temperature of 100°F.
Where do you put expansion coupling?
0:110:53Expansion Joint In Electrical PVC Conduit - YouTubeYouTubeStart of suggested clipEnd of suggested clipWithout fail what happens is these joints are going to crack. Over time because of expansion andMoreWithout fail what happens is these joints are going to crack. Over time because of expansion and contraction. So what this electrician do is really smart you put this expansion sleeve which flexes up
How often do you need an expansion coupling?
Usually, expansion joints should be no farther apart than 2 to 3 times (in feet) the total width of the concrete (in inches). So for a 4 inch thick concrete slab, expansion joints should be no more than 8 to 12 feet apart.
How do you install expansion fittings?
0:242:45PEC-100 Expansion Coupling - YouTubeYouTubeStart of suggested clipEnd of suggested clipFirst I'm going to attach the slip coupling to the expansion. Coupling. Apply primer to theMoreFirst I'm going to attach the slip coupling to the expansion. Coupling. Apply primer to the telescoping portion of the expansion coupling. And the inside of the slip coupling.
Do I need an expansion coupling?
Expansion fittings are needed in abo- veground installations where temperature chang- es are anticipated to exceed 25°F (14°C). When the straight run length is greater than 25 feet and expected temperature change is greater than 60°F expansion fittings are usually needed.
What is a PVC expansion coupling used for?
When you need to repair PVC pipe that's in a hard to reach place or it is difficult to replace the whole pipe, we've got what you need. PVC expansion couplings are a unique, quick-repair for a leaking PVC pipe, and are simple to install.
Do you need PVC expansion joint?
A general rule of thumb is that for every 100°F temperature change in a 100 ft. run of PVC conduit, the conduit will undergo 3.6" of expansion or contraction. In installations where the expected temperature variation exceeds 25°F expansion joints must be used.
Can PVC expansion fittings be used underground?
PVC expands so much, that just a single 10 ft piece expands more than 1/4" in typical outdoor ambient temperature ranges. When used underground, I've rarely seen expansion fittings installed in the long runs below grade. And I'd expect sand to clog the piston, rendering it ineffective.
Do I need an expansion joint between old and new concrete?
Are Concrete Expansion Joints Necessary? Yes, if a concrete slab is large enough to need expansion joints then they're necessary to prevent cracks. As concrete expands and contracts it needs room to move. Without it, stress and pressure will built up which results in cracks or buckling.
What happens if you don't put expansion joints in concrete?
If you have a concrete floor in your commercial building, you know expansion joints are necessary to allow for the natural expansion and contraction that occurs from temperature changes. Without these joints, large cracks can travel across your floor, creating costly damage.
Can you add expansion joints after concrete is poured?
You can install concrete expansion joints before or after the concrete is laid. In the first instance, a flexible material is inserted along the length of the joint before the concrete is poured [link to how to lay a concrete slab].
Do I need a conduit expansion joint?
Section 352.44 of the National Electrical Code® (NEC) requires that expansion fittings be installed for PVC rigid nonmetallic conduit to compensate for thermal expansion and contraction where the length change is anticipated to be 6 mm (1/4 inch) or greater, in accordance with Table 352.44 of the NEC, in a straight run ...
Do you need PVC expansion joint?
A general rule of thumb is that for every 100°F temperature change in a 100 ft. run of PVC conduit, the conduit will undergo 3.6" of expansion or contraction. In installations where the expected temperature variation exceeds 25°F expansion joints must be used.
Does EMT need expansion joints?
Per my understanding, EMT doesn't require expansion couplings. The NEC doesn't implicitly indicate the use of couplings as it does in other conduit type sections e.g. PVC has a sub-section titled 352.44 Expansion Fittings.
When an expansion joint is used with metal raceways what must be provided?
300.7(B) Expansion Fittings. Raceways shall be provided with expansion fittings where necessary to compensate for thermal expansion and contraction.
Can PVC raceways be expanded?
PVC raceways are not the only type that could benefit from an expansion fitting. This rigid metal conduit expansion fitting was needed on the roof to compensate for thermal expansion. Go to Thomas & Betts for a look at an example of expansion/deflection fittings.
Can expansion fittings be used on PVC raceways?
Many electrician associate expansion fittings with PVC raceways only. Movement can occur for any type of raceway. Many people have no idea that expansion fittings may be needed on more than just PVC raceways.
How is cold expansion installed?
Cold-Expansion is installed by expanding the pipe (PEX-A) and collar which is installed over the end of the pipe using a power expansion tool. Manual hand tools are also available for small jobs. When the pipe and collar are expanded the fitting is inserted and held in position for a short duration allowing the pipe and collar shrink back down to create your connection.
What is a crimp fitting?
On the other hand, crimp fittings are installed using a copper crimp ring that goes on the outside of the Pipe (PEX-B or PEX-C). The connection is secured using a crimping tool that compresses the copper ring. For a more detailed understanding of how to install crimp fittings, see our blog here.
What is crimp PEX?
Crimp (F2159) Plastic PEX Fittings. There is confusion regarding crimp PEX standards, since there is a different standard ASTM 2159 for plastic and ASTM 1807 for metal. This is because the plastic standard requires a thicker wall than metal PEX fittings.
Can you use a pinch clamp on a crimp fitting?
Crimp fittings can also be installed with a Stainless pinch clamp which requires a different tool than crimp rings. For more information on how to use a Stainless Pinch clamp to Install Pex Fittings, see our blog here.
What is an AF8 expansion fitting?
AF/AF8 Series Expansion Fittings are for use with IMC or rigid conduit installations. The AF/AF8 Series prevents damage of the electrical installations typically used in buildings and bridges by compensating linear movement due to temperature fluctuation or structural movement. This series provides up to a maximum 4” and 8” conduit movement (2” and 4” in either direction). For applications involving IMC, a 15” minimum length of rigid conduit should be used entering the expansion fitting due to the slightly smaller O.D. of the IMC.
What is DF fitting?
DF Series Deflection Fittings compensate any directional movement between two conduit joints. These fittings can withstand sporadic vibrations channeled by rotating equipment or vehicular traffic. The DF Series allows for a ¾” contraction and extension movement as well as a 30° angular deflection to any direction and still maintain its structural integrity.
What is AFDF expansion?
AFDF Series Expansion/Deflection Combo Fittings compensates for linear and 3/4” level movement in any direction between two conduit joints in runs of IMC or rigid conduit. AFDF Series combines the DF style fitting with the AF style fitting for an additional 4” movement (2” in either direction) when the 3/4” linear movement in the DF is not enough. Helps prevent damaged conduit runs caused by temperature fluctuations and structural variations by assisting in movement.
What is PEX expansion?
PEX expansion fittings also referred to as “cold expansion ”, uses the expansion methods for connecting PEX tubing and fittings. The method advised by ASTM (F1960 standard specification) – uses a PEX expansion ring with a larger diameter pipe. An outer plastic sleeve is overlapped at the end of the pipe, expanded to insert a fitting.
Why do plumbers prefer expansion?
However, despite the pricing and form shortcomings, most plumbers prefer to work with expansion because installation is more efficient. There are fewer leaks, and it also seems to be more durable against extreme colds and frozen pipes, etc.
Why are plumbers using PEX pipes?
This is partly attributed to the fact that PEX can be more affordable and easier to work with.
What is expansion fitting?
Expansion fittings are intended for use with PEX-A tubing only, using expansion connection method. Poly expansion fittings in this category are a direct replacement for Uponor/Wirsbo EP series poly fittings and are compatible with hePEX and AquaPEX tubing brands as well as RAUPEX from Rehau and Mr. PEX tubing. These fittings are manufactured to ASTM F1960 standard, are lead-free compliant and are NSF certified for potable water applications.
What is PEX fitting made of?
A: Like most poly PEX fittings on the market, including Uponor, these are made using Radel polyphenylsulphone (PPSU) polymer, which has a long history of use in plumbing, medical and aerospace industries.
Can you replace Uponor fittings?
A: Yes. They can replace Uponor fittings and can be installed using Uponor, Milwaukee and Everhot expander tools. Just like Uponor fittings, they require appropriate size expansion rings and are installed in the same manner.
