Prime Conduit FAQs - The five questions posted most recently:

We are looking at a swimming pools pump room project that requires wiring in an environment that contains muriatic acid. I did look at your corrosion resistance table but did not see muriatic acid listed. Is your PVC conduit and enclosures listed for this environment?

Fri, 20 Jan 2012 19:15:00 GMT

Muriate Acid also know as Hydrochloric Acid (HCL) is unacceptable for PVC raceways when it is at 100% concentrations. PVC conduit is good to use at concentrations of 37% or less.

Would like to know if you have any technical info on installations where waterproofing the ducts is necessary. This particular installation has ducts buried below the water table and would normally be submerged. If expansion joints are installed, are they water tight?

Fri, 20 Jan 2012 19:15:00 GMT

Conduit is designed for wet locations as is evidenced when it is in direct burial or concrete encasement applications.� Furthermore, the expansion fittings have two o-rings and they are suitable for wet locations.� However, in most direct burial or concrete applications, expansion fittings are not required as they take on the expansion/contraction rate of the earth or concrete and thus become ineffective.

I have a contractor who would like to know if primer must be used when connecting Sch40 PVC. In other words, will PVC cement work without the primer and is it considered to be installed correctly without the primer?

Fri, 20 Jan 2012 19:14:00 GMT

The National Electric Code does not require primer to be used in addition to PVC solvent cement.� However, primer will aid the assembly and ensure the quality of the joint, as it better prepares the joint for solvent cementing.

I couldn't find any information on 8" P&C Duct Type EB or DB in your on-line information. Do you still make 8"?

Fri, 20 Jan 2012 19:13:00 GMT

The only 8" duct that we offer is the 8" Schedule 40 non-UL listed conduit in 10 or 20 ft lengths.� Part numbers are 59618 followed by -010 for a 10 ft length or -020 for a 20 ft length.� Furthermore, this can be concrete encased.

I received a call from a local engineering firm. They are running conduit under a bridge in a high voltage application. (I am not the electrical rep, just trying to help this guy out). Anyway, they are considering using either fiberglass or PVC and have asked what are the advantages to using the PVC over the fiberglass for this application.

Fri, 20 Jan 2012 19:13:00 GMT

Fiberglass is usually used in bridge crossing because they can have a larger distance between support. In addition, fiberglass is available for bullet resistance. People will shoot at the pigeons under bridges.�

Besides those two facts there is not an advantage for one over the other.