Electrical Conduit Types, Applications, Codes, Standards


Here we explain the many different types & uses of metal electrical conduit, rigid and flexible, or conduit made from aluminum, stainless steel, PVC-coated steel, stainless steel. We comprise ips for scrutinizing & installing electrical conduit in houses and electric conduit cutting, bending, installing hints

This article series clarifies both electrical electrical conduit and plastic or non-metallic electrical conduit goods, and answers fundamental questions about installing electric conduit. Electric conduit is plastic or metal rigid or elastic tubing used to track electrical cables in a construction.


Electrical Conduit Types

        → Wiring outlet

Steel electric conduit and tubing (EMT) are used for several decades to protect electric wiring from mechanical damage and also to supply electromagnetic field or electromagnetic interference shielding for wiring and circuits of different kinds.

Vendors of EMT stage to its high re-cycled material (63 percent ) and its recyclability at the end of its lifetime.

       → Size of Conduit

The selection of electric conduit substances and possessions is big and is designed equally for specific applications like corrosion or moisture immunity.

The interior diameters of all conduit vary in the nominal diameter dimensions, and comprise 23/32″, 21 32″, 5/8″, 39/64″, 37 64″, and 2 1/16″ inside real measurements.
The wall thickness of electric conduit materials ranges one of 1/8″, 7/64″, 3/32″, 5/64″, 1/16″ and 3/64″
Rigid conduit is marketed largely in 10 ft. lengths with 5 ft. lengths available typically for its larger-diameter sizes.


EMT, Electrical Metallic Tubing, Thin-wall metal conduit

The most frequent sort of electric conduit for home wiring is your thin-wall type. It’s joined to additional lengths of conduit and also to boxes by pressure-type fittings.

EMT Conduit comes in just two metallic kinds:

The cables used will be just like the person conductors utilized in steel armor plastic and cable sheathed cable. Wires in conduit need to follow regular coding. In a two-wire electric circuit you want one black cable, one white cable, and a single ground cable.

The overall process of using thin wall conduit is like the usage of metal armor cable. The huge distinction is that conduit can’t be”snaked” through openings in walls and ceilings.

You should have complete access to joists and studs to put in electric conduit. So you probably will not wish to use it unless your regional code demands it.

From the U.S. producers of EMT or Electric Metallic Tubing include Allied, Calbrite, and Granger-Approved manufacturers.


FMC, Flexible metal electrical conduit


Flexible metallic conduit or FMC, is a helically-wound elastic metal electric wiring conduit, frequently made using aluminum like the ALFlex™ conduit shown here.

Adaptive metallic electrical conduit can be used chiefly in commercial and industrial building world wide. In residential uses you will find FMC utilized to connect with an electrical oven or electric cooktop.

This conduit can be marketed as LFMC or liquid-tight flexible metallic conduit.

LFMC is explained from the U.S. National Electric Code NEC® Article 350 and has to comply with UL 360 from the U.S. or CSA C22.2 No. 56 at Canada.

Flexible metallic conduit can be purchased in rolls and cut to the essential length, combined with proper fittings.




Pre-Wired Flexible Electrical Conduit Whips


What’s the Difference between Flexible Metal Electrical Conduit and Armored Cable or “BX” Wiring?

Flexible metallic conduit offered for electric wiring (preceding photograph above) is marketed vacant, and is bigger in diameter than pre-wired armored cable like the 12/3 Armorlite® armored cable revealed here.

This electric cable is pre-wired using THHN/THWN conductors and is meant for use in cable trays also includes a green-insulated floor cable.

Watch out. Don’t use set-screw kind connectors with this specific cabling.

Doing so risks pinching the cable end and clipping to the cables, causing a brief circuit.


FMC and LFMC Standards, Codes, Installation Guidelines


The next Standards govern FMC and LFMC

UL 1, Flexible Metal Conduit, Abstract: These requirements cover elastic steel and aluminum conduit created for use as metal raceway for cables and wires in compliance with the National Electric Code, NFPA 70.
UL 360, Liquidtight Flexible Metal Conduit

1.2 This conduit is for software where flexibility of this conduit is essential during installation, operation, or maintenance and the included conductors require protection against vapors, liquids or solids.

1.3 This conduit is circular in cross section, using an outer liquid-tight, nonmetallic, sunlight-resistant coat over an interior elastic metallic center, and is for use in wet, dry, or oily places where the conduit is exposed but isn’t subject to physical harm.

Conduit which isn’t marked with a fever designation or is indicated”60 C” is for use at temperatures not in excess of 60°C (140°F).

Conduit that’s for use in fatty or dry places at a temperature greater than 60°C (140°F) is indicated”____C sterile, 60 C moist, 70 C oil res” or”____C sterile, 60 C moist, 70 C oil immune” with”80 C” or”105 C” inserted as the dry-locations temperature.

1.4 Conduit that’s marked”80 C 60 C moist, 60 C oil res” or”80 C 60 C moist, 60 C resistant” is for use at 80°C (176°F) and reduced temperatures in atmosphere, also 60 °C (140°F) and reduced temperatures at which subjected to water, oil or coolants — which is, to cutting oils and so on in machine-tool and other industrial uses.

1.5 Conduit indicated according to 24.4(g) is limited to usage in petroleum free surroundings.

1.7 These requirements don’t cover liquid-tight flexible nonmetallic conduit. Flexible nonmetallic conduit is covered in the Standard for Liquid-Tight Flexible Nonmetallic Conduit, UL 1660, along with the fittings for this particular conduit are covered in the Standard for Conduit, Tubing, and Cable Fittings, UL 514B.

1.8 These requirements don’t cover elastic tube.

1.9 These requirements don’t cover electrical nonmetallic tubing (ENT).

UL 467 on Grounding and Bonding
This Standard applies to grounding and bonding equipment to be used in accordance with the Canadian Electrical Code, Part I, CSA C22.1, in Canada, the National Electric Code, NFPA 70, at the USA, along with the Standard for Electrical Installations, NOM-001-SEDE, at Mexico.

1.2 This Standard applies to the next grounding and bonding equipment:

a) floor clamps, bonding apparatus, grounding bushings, water-meter shunts, grounding electrodes, and the like used at a grounding system;

b) equipment for making electrical connections between
I) the grounding conductors used in electric power systems, non-current-carrying metallic parts of electric equipment, armored grounding cables, metal raceways, and the like; and
ii) grounding electrodes;

c) equipment for making electrical connections between
I) the grounding conductors used in telecommunications systems like phone, radio, CATV, network electricity broadband, and the like; and
ii) grounding electrodes;

d) hospital grounding Trainers and breeding grounding cord assemblies (such as Mexico and the USA, see Annex a);

e) bonding apparatus for producing electrical connections between
I) that the hex head of a brass fitting utilized in a piping system according to 250.104 of NFPA 70; and
ii) the grounding electrodes; and
f) intersystem bonding terminations for linking intersystem bonding and grounding conductors for different systems according to NFPA 70.

Additionally, NEMA, the National Association of Electric Equipment and Medical Imaging Manufacturers has generated a number of criteria and setup processes, bulletins and manuals such as FMC and LFMC for example

IMC: Intermediate Metal Conduit

Intermediate Metallic Conduit or IMC is lighter weight, metallic conduit and can be ranked as more powerful compared to other rigid conduit. IMC was initially made by Allied Tube & Conduit.

IMC, supplied in both threaded IMC and non-threaded IMC forms, is a rigid metallic conduit tube, commonly hot-dipped stainless steel or stainless steel. The inside of stainless steel IMC is generally coated with an anti-corrosion coating.

Threaded IMC is linked with threaded couplings, C condulets, sweeps and pops. The tube is cut with a pipe cutter or tube cutter, after which ribbons cut utilizing a ribbon cutting instrument. When trimming IMC, be careful to eliminate burrs on the tube inside that would otherwise harm electric wires being pulled through the conduit.

IMC is typically utilized in hazardous places, and in its own stainless steel formula, IMC is broadly utilized in the food and drink sector, in chemical plants, in decorative and pharmaceutcial sectors, in refineries, in paper and pulp mills, in coastal and marine sites, in other corrosive environments.

An benefit of IMC is its own bigger interior diameter compared to RMC of the exact same nominal dimensions, which makes it easire to pull wires.

IMC comes in such forms

LFMC: Liquid Tight Flexible Metallic Conduit Whips, Pre-Wired

Pre-wired Excels in residential Programs (Picture above right) are Found linking air conditioner & heat pump blower components to their external power supply. There the elastic whip averts problems with vibration-loosened relations in the conduit.

Levels that transcend the laws of mathematics as well as the properties of these substances.

Should you induce flexible conduit or even a pre-wired conduit Whip to bend too intensely over too brief a radius like in its link to some rigid surface that the conduit will gradually crack, as Tim Hemm’s picture (left) illustrates.


RMC Rigid Metal Electrical Conduit – threaded metal electrical conduit

Rigid metallic conduit is a heavier gauge steel electric conduit utilizing threaded couplings and fittings and is the thickest, or stiffest of these conduit substances used for electric wiring.

A normal RMC and frequently the sole RMC residential program would be to enclose the electric service entrance wiring from the electric firm’s overhead wires in the mast-head to the electric panel mounted on the construction wall.

RMC is sold in the straight lengths and to pre-formed sweeps and bends at 90° and 45° angles.

Rigid metal conduit and its mandatory couplings, bends, sweeps, and Condulets that allow wiring insertion & splicing are offered in the following kinds and alloys:


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