Electricians choose from various flexible conduits. They protect and route electrical wires safely. Flexible conduit allows moving, removing, or installing wiring easily. Proper selection depends on the application and environment. This article explores conduit material types like flexible plastic or metal. It offers choosing advice for projects like new construction or basement renovation projects. Learning conduit attributes aids code-compliant, durable installations.

Flexible Conduit Types

Three main flexible conduit types exist—plastic, metallic, and liquid-tight. Each has benefits for situations. Plastic like PVC is lightweight, affordable, and resists chemicals. However, it can be damaged by sharp objects or high heat. Metal like galvanized steel withstands physical abuse but may rust or corrode without protection. Liquid-tight such as flexible metal or nonmetallic varieties suit damp, wet areas or outdoor use. Their watertight exterior shield enclosures. Factors such as uses, location, and conditions guide choosing the best type.

Conduit Material Qualities

We know that flexible plastic conduit typically uses polyvinyl chloride (PVC) or polyethylene (PE). Both resist corrosion but each has pros and cons. PVC stands up well chemically but is degraded by sunlight. It poses a lower fire risk than PE, which weathers sunlight better yet burns easier. Look for heavy wall thicknesses, sturdy couplings, and fire-rated versions for high-heat spaces. A metallic flexible conduit like galvanized steel or aluminum protects against physical hazards. Exterior liquid-tight or internal liner guards against rust or corrosion issues. Stainless steel versions cost more yet virtually never corrode.

Codes and Safety

Following electrical and building codes maintains safety. Conduit must safely enclose and protect conductors from damage. It also supports wire weight to avoid stress points. Sizing conduit correctly prevents overfilling that can cause wiring friction and heat buildup. Flexible conduit lets no more than one-half of its internal cross-sectional area fill with conductors. Bends or fittings require extra capacity. Conduits enter and exit enclosures, such as junction boxes, in approved fashions. Proper grounding prevents shocks.

Basement Renovations

Basements pose challenges like moisture, limited access, and structure movement. Membrane-wrapped nonmetallic conduit withstands humid conditions without rusting internally. Liquid-tight flexible metal conduit also works well in basements. Its interior vinyl coating protects conductors from water while allowing flexibility. Using expansion/deflection fittings around structure joints handles wood framework expansions and settlements. A skilled electrician routes conduit out of the way of plumbing or ductwork. Straps or supports safely secure conduit along joists.

New Construction

New builds offer conduit installation before structural components like drywall hide boxes and paths. Contractors pull future wiring now more easily than later retrofits. PVC remains a top choice when concealed within framing cavities protected from physical abuse or heat sources. Bend radiuses must stay within conduit specifications to avoid kinks. Metallic conduit suits exposed runs attractive in finished areas like baseboard heat. Greenfield straps secure conduit safely to framing until boxes host final connections. Document conduits’ paths and pulls with the blueprints.


By learning flexible conduit attributes, professionals can select the best types suited to projects, environments, and code standards. Considering applications like basement renovations or new construction aid choosing based on conditions, routing, load capabilities, and long-term durability. Proper installation maintains safety, access, and operational reliability of electrical systems well into the future. Flexible conduit brings wiring where needed conveniently while meeting all applicable standards.