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What Is Flex Conduit?

Aug. 16, 2022

Contents

1. What is flexible conduit used for?

2. How does flexible conduit work?

3. Where can I use flexible PVC conduit?

4. How do you secure a flex conduit?

5. Can flexible conduit be used outdoors?

6. Can you run Romex in flex conduit?

7. Is a flexible non metallic conduit?

8. Does Flex need to be strapped?

9. Can I run Flex outside?

 

What is flexible conduit used for?

Reduced wall flexible conduit can be used in flexible metal raceway systems for electrical power, communication cables, motor leads, listed assemblies and wire fixtures and manufactured wiring systems.


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How does flexible conduit work?

Flexible Metal Conduit (FMT) and Liquid-tight Flexible Metal Conduit (LFMC): Flexible metal conduit has a spiral construction which allows the conduit to bend easily, simplifying installation in walls or other structures.

 

Where can I use flexible PVC conduit?

Some code-compliant PVC fittings can be used with ENT inside walls, floors, some ceilings or encased in concrete. Outdoor flexible nonmetallic tubing is strong, watertight, non-corrosive and weighs less. Metal or plastic boxes can be used with nonmetallic conduit. Always run a ground wire when using PVC conduit.

 

How do you secure a flex conduit?

You simply insert the connector until the conduit is firmly in place and then use a screwdriver to tighten the screw. As the screw tightens, a metal band will tighten around the fitting and hold the connector firmly in place.


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Can flexible conduit be used outdoors?

Flexible Metal Conduit is a helically injury, flexible tubing usually made from aluminum. Because it can not be used outside or in other wet areas, Flexible Metal Conduit is rather restricted in its usefulness, yet there are a couple of applications where it is the clear selection.

 

Can you run Romex in flex conduit?

Yes, NM cable can be in conduit. In fact. NEC calls for it to be in conduit, when protection from physical damage is required.

 

Is a flexible non metallic conduit?

Flexible plastic conduit is also sold as LFNC, liquid-tight nonmetallic conduit. Plastic conduit can be heated and bent to non-standards shapes, or pre-formed bends and elbows can be used. Use proper fittings to join and terminate rigid plastic conduit tubing, and protect it from damage too.

 

Does Flex need to be strapped?

The general rule for securing and supporting FMC is to fasten it within 12 inches of the box and secure it no further than every 4.5 feet. If the FMC is installed above an accessible ceiling, exception 4 allows the support spacing to be increased to 6 feet “from the last point where the raceway is securely fastened”.

 

Can I run Flex outside?

There’s no actual Regulation preventing you from using flex inside or out on any part of an installation. The same rules apply to flex as to any other type of cable, fit for purpose etc. Precautions have to be taken to prevent separation or spreading of individual wires when making fine wire terminations.


Zhejiang Flexible Technology Co., Ltd. has developed into a leading manufacturer in the flexible conduit market. We are professional in producing flexible conduits. Welcome your any inquiries. Feel free to contact us.