Frequently Asked Questions

AMERICAN FITTINGS Corporation is committed to the growth and development of the electrical industry. This area of our website is designed to help the electrical professional stay on top ofcurrent application and regulatory issues.

This area will be updated on a regular basis to provide tips for installation and usage of AMFICO products, as well as regulatory information from the Federal Government regarding the industry.

CURRENT INDUSTRY TOPICS

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When “Lower Costs are Available on Buy American Projects”,  What’s the Law ?

UNDERSTAND THE “TWENTY-FIVE PERCENT COST WAIVER”

The ARRA contains an exception allowing a project to use foreign products only if the use of  products produced in the United States will increase the cost of the “overall project” by more than 25%. This does not mean that the exception applies if the cost of the product will be 25%
greater than foreign products; rather the cost of U.S. made product must increase the cost of the entire project by more that 25%. Indeed, it is longstanding precedent of the FHWA’s Buy America provision – upon which the ARRA’s Buy America provision is based – that “the 25  percent differential applies to the total bid for the entire project, not just the bid prices for the steel or iron products.”

Both the interim regulation and the OMB guidance replicate this requirement and apply the 25 percent differential to the entire construction project. 

Read More Here → 


 

 

What is EMT Conduit?

Conduit, usually fabricated of steel, which encloses electrical wiring, thereby protecting the wiring from outside damage. The difference between electrical metallic conduit and electrical metallic tubing (EMT) is that conduit is heavy-walled and usually has threaded ends; in contrast, tubing is thinner and is not threaded. Between these two is an intermediate metallic conduit (IMC), which is 25 percent lighter and less costly than EMT; it may be threaded or thread-less.

EMT tubing manufactured in the United States is from steel, and is welded then, normally galvanized plated. Since AMERICAN FITTINGS EMT fittings are manufactured from steel and are fully machined they are the fitting of choice for total integrity in industrial applications. Unlike zinc die cast fittings which crack when fully torqued and are inconsistent in fit form and function, steel fittings will never “crack under pressure”.


 

What Are Typical Applications for Flexible Metal and Liquid Tight Conduits & Fittings?  

Typical applications for liquid tight conduit and liquidtight fittings include the wiring of machine tools, motors, transformers, food processing equipment, robotics, air conditioning units, illuminated store front signs and billboards, etc. The flexible metallic conduit and fittings protect conductors from mechanical damage due to vibration
and movement, and seal out cutting oils, coolants, water, dust, etc.
Applications such as these can be found in, but are not limited to,industries such as:

• Machine tool manufacturers
• Electric power generating plants
• Waste treatment facilities
• Paint manufacturing facilities
• Automobile manufacturing facilities
• Aerospace industries
• Breweries
• Food processing plants
• Dairies
• Pulp and paper mills
• Petroleum refineries
• Chemical and petrochemical plants


 What is the Buy American ACT and It’s Application?

The Buy America provision of the ARRA mandates that “none of the funds appropriated or
otherwise made available by this Act may be used for a project for the construction,
alteration, maintenance, or repair of a public building or public work unless all of the iron,
steel, and manufactured goods used in the project are produced in the United States.

WHAT DOES THIS MEAN?

Generally speaking, the ARRA Buy America requirement provides that:

  1. No foreign iron, steel, and manufactured goods are permitted;
  2. For use in a project for the construction, alteration, maintenance, or repair of any public building or public work;
  3. If the funding for the project is made available by the ARRA

The manufacturing and assembly of the parts featured fully conform to the Buy American, Buy American Provisions, Trade Agreements Act and the American Recovery and Reinvestment (ARRA) and section 1605 of that act, Public Law 111-5. A requirement for all federally funded projects and many state and municipal jobs. Material Certs are furnished upon request. Read More Here → 


Hints on Selecting the Right Conduit and Cable Fittings

Conduit and cable fittings are available in a variety of materials such as malleable iron, steel and die-cast zinc. Material selection is usually a personal choice based on past experience or specification requirements. Regardless of the material, all fittings must pass the same mechanical and electrical performance tests at independent testing laboratories such as Underwriters Laboratories (UL) or Canadian Standards Association (CSA).

Many fitting manufacturers are developing new products or redesigning existing fittings that can be considered “labor savers.” These products will reduce the electrical contractor’s installation time. When purchasing fittings, contractors should expect consistent quality, performance and ease of use.

UL and CSA monitor electrical codes and revise their listing or certification specifications to comply with revisions or additions. Products that have been tested and listed by an independent testing facility will perform the same function as domestic manufactured products.Listed or certified foreign-made fittings must pass the same functional requirements as nationally produced fittings. UL and CSA provide follow-up inspection services for listed or certified fittings in many other countries such as India and China. UL and CSA require that all application information and special instructions be printed on the smallest carton label. Types of conduit and/or cable will be noted on the label.


 

Ground Hubs and Their Use

Grounding Hubs or sometimes called bushings are intended for use with threaded rigid or intermediate metal conduit and an aluminum or copper lug for connecting a bonding or grounding wire. Never exceed or reduce the wire capacity specified on the lug or carton label. Bushings have insulated throat for abrasion protection when pulling wire, black or brown colored insulator rated for 150 degrees C, other colors rated 105 degrees C. The set screw in the Bushing assures bonding to the conduit.

When installing a Grounding Bushing to rigid or intermediate metal conduit, a locknut must be used on the inside and outside of box or enclosure. Assemble the Bushing hand tight and with wrench, or similar tool, tighten additional 1/4 turn; tighten set screw and assemble bonding or grounding wire. Note: the Bushing lug may be rotated to prevent interference with box or enclosure. Tighten screw securely after repositioning lug. Grounding Bushings provide electrical continuity required by the NEC for service entrance and circuits rated over 250 volts.


Why Do Some Fittings Require Taping to be Underwriters Laboratories (UL) Listed?

Raceway systems such as EMT and rigid conduit are permitted by most codes to be embedded in concrete. The solid exterior of these conduits eliminates the possibility of concrete entrance, however, the termination with the connector or coupling can be susceptible to concrete entering the raceway. Included in the UL testing procedure is assembly of the connector or coupling to the conduit, pouring of Portland-type concrete over test samples enclosed in form box, vibrating the concrete surface, and after concrete drying examine the connections for concrete entrance. Although compression style connectors and couplings pass these tests in all trade sizes because of gland ring design, set screw type may have difficulty conforming to UL requirements. When the set screw is tightened onto the conduit, the fitting material will “yield”, or stretch, enough to create an opening at the conduit/fitting connection. Set screw fittings in the smaller (1/2″, 3/4″, and 1″) trade sizes are less likely to stretch to the point that would permit entrance of concrete. However, 1-1/4″ and larger size fittings will yield enough so that concrete can enter the raceway. UL will accept product carton marking that specify “Concrete-Tight When Taped” on fittings that cannot pass the fore- mentioned testing since the tape prevents entrance of concrete into the raceway. The taped joint must completely encircle the conduit/fitting connection.


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Last Update: November 1, 2013
 
 

 

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