Ocal PVC Coated Systems Installation Practices for PVC...

Ocal Installation InstructionsElectrical Division 1

Ocal PVC Coated SystemsOcal PVC Coated Systems

Installation Installation Practices for PVC Practices for PVC Coated Conduit Coated Conduit

and Fittingsand Fittings



• PVC coated conduit is installed much in the same manner as rigid galvanized steel conduit, but, special precautions are needed for a damage-free installations.

• Manufacturers offer hands-on training and this is recommended.

• The following slides demonstrate the correct methods to install this product.

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Presentation Notes�

Contact NEMA manufacturers directly to obtain training for proper installation techniques. �



Steps to a proper PVC coated Conduit and Fitting Installation

1. Clamping2. Cutting3. Threading4. Bending5. Assembly



CLAMPING - TOOLSIt is recommended to use a yoke style vise with manufacturers supplied adapters (jaw inserts) for clamping pvc coated conduit. These adapters provide greater clamping force and prevent pipe spinning during threading.

JAWS23 – for RIDGID 23 or 40A Yoke vise

JAWS76 – for Rothenberger Yoke Vise

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• If jaw-type or chain-type vises are used, a field manufactured clamp can be made.

• Use a piece of rigid conduit one size larger than the PVC coated conduit. This “nipple” without threads should be 6”-8” in length.

– It is important to grind away any rough edges on the “shells”

– Scoring the interior will help grip the pvc coating.

– See steps to field fabricate in next slide.

CLAMPING - TOOLS

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Care should be taken when creating your own clamps. Make sure there are no rough edges that would damage the PVC coating.�



CLAMPING - TOOLS

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These pictures detail the cutting of conduit in sections to create the clamps.�



CLAMPING - TOOLS

Tri Stand chain vise using field fabricated ½

shells.

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These pictures detail the proper clamping using the chain type vise. �



Cutting - Tools - Bandsaw• Band saws are typically used for cutting

conduit. When using a band saw, the cut results in the PVC being flush with the conduit. This will not allow a threader to start on the end.

• Remove about ¼” of the PVC using a knife.

• A band saw cutter will usually not cut the conduit at a “perfect” 90°

angle (the accuracy of this cut depends heavily on the skill of the operator).



Cutting - Tools - Roller Style Cutter • A roller style cutter is

preferred.• It cuts at 90°.• It removes about ¼” of the

PVC at the same time as cutting.

• No additional PVC removal will be necessary.

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Cutting - Tools - Roller Style Cutter

Roller Pipe Cutter

•P70045C Up to 2”

•P70060C Up to 4”

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These pictures show a typical roller style cutter cutting conduit secured with a chain type vise. The bottom photo shows the PVC removed from the end by the cutter, which allows a threader to start. �



Threading - Tools

• PVC coated conduit has a larger OD than galvanized rigid conduit.

• Standard dies will not fit over the PVC coating.

• It is recommended to purchase special dies from the PVC coated conduit manufacturer.

• Scoring the PVC will help eliminate clogging dies.

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Without Scoring With Scoring

Threading - Tools

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The scoring lines shown in the bottom center photo allow for threading to occur without clogging. �



• Standard dies may be modified to accommodate PVC coated conduit.

• The throat/collar (guide sleeve) must be made larger by 0.1” to allow the larger OD PVC coated conduit to enter.

Threading - Tools

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Won’t fit regular die

Threading - Tools

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Threading - Reamers - Tools• Following the cutting and threading operation,

ream the conduit with normal tools used with galvanized rigid conduit.

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Bending – Manual • Hand bending small sizes is acceptable. • Do NOT use any type of lubricant on the shoes.

• Use an EMT bender one trade size larger than the conduit being bent. For example, when bending ¾” trade size PVC coated conduit, use a trade size 1” bender.

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Bending - Electric

A bender made specifically to bend PVC coated conduit is preferred. For trade sizes larger than 2, a hydraulic bender should be used.

Do NOT use any type lubricant on the shoes.

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Bending - HydraulicMost manufacturers of hydraulic benders offer special shoes for PVC coated conduit. If conventional shoes are used, their sides must be modified to allow for the coating thickness.This is not recommended as it can create a safety hazard.

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There may be limitations on the sizes 5 and larger, contact the manufacturer for factory supplied bended conduit. �



Assembly - Tools - InstallationPVC coated conduit requires special wrenches to protect the coating. Pipe wrenches with extra fine teeth, strap type wrenches and slip-joint pliers with special jaws should be used to avoid damaging the PVC coating.

P70159C 10” long

P70160C 14” long

P70161C 18” long

P70162C 24” long31355 up to 2”

31370 up to 5”

J442 - 12”handle ½”-1-1/4”

J460 – 16”handle 1-1/2”-2-1/2”

Presenter�


Photos include fine teeth pipe wrench, strap type wrench, and slip joint pliers with special jaws. �



Assembly - Thread Protection– Where corrosion protection is

necessary and the conduit is threaded in the field, the threads shall be coated with an approved electrically conductive, corrosion resistant compound.

– Zinc rich paint, conduit manufacturers supplied coatings, or listed coatings should be used.

Presenter�


NEC 300.6A requirements are as noted in this slide. �



Assembly - Special Care - Sleeves• Sleeves on PVC coated conduit

couplings and fittings are provided to insure a continuous coating. Sleeves shall not be cut off or split. The lengths of the sleeves are covered by NEMA RN-1 Section 3.5.

• In cases where two sleeves meet, each sleeve is permitted to be trimmed equally to allow the two sleeves to fit flush.

• To make installation easier, silicon sprays may be used on the inside diameter of the sleeve

Presenter�


It is important to reference NEMA RN-1 for the manufacture of PVC coated conduit and fittings to insure consistent product constructions. �



Assembly - Special Care• Since the threads are not visible during

installation, take extra care to be sure that threads are fully engaged and made up wrench tight.

•Treadles fittings shall NOT be

used with PVC coated conduit.

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The Listing label will contain a requirement “For Use With Threaded Fittings Only”. �



Assembly - Special Care - Patching• In cases where the PVC coating is damaged

during installation, these areas shall be patched following the PVC coated conduit manufacturers instructions.

Presenter�


The picture details one manufacturers patching products. These may vary by manufacturer. Use only the PVC coated conduit manufacturers patching materials on their conduit only. Do not mix manufacturers products. �



Special Care- Grounding and Bonding

When expansion joints are used in PVC coated conduit systems, it is recommended to use one that has an internal bonding jumper.

The use of an expansion joint without an internal bonding jumper, requires removing portions of the PVC coating where the external jumper is attached followed by repairing the areas by patching the exposed metal.

Very messy

Presenter�


Internally jumpered expansion fittings allow for cleaner installations and avoid messy patch work. �

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