Please assure me I'm not going to burn my house down.


I recently bought some new mono class D amps to replace a stereo class D. I had a pair of identical diy power cords connected to the stereo amp and my preamp.

Well, with monos I was obviously going to use the identical power cords. So I needed a new PC for my pre, as the older diy version I had laying around just used thhn wire from Lowe’s and didn’t sound great. So, after some thought and research, I decided to make a PC out of cat 5 plenum cable. I kept it in its blue sleeve (containing 4 twisted pairs) and then I braided 3 lengths together for each conductor. I then took those three braids and braided them. What I have sounds incredible and I’m fairly confident that it is safe electrically.

Please reassure me. Or tell me I forgot about x, and that I should cease and desist. Or laugh at how cheap I am...

But really, I’m not going to start a fire here, am I? 8 conductors per length x 3 lengths for each conductor equals 24 strands of 24awg. Which equals 10awg for each conductor...
toddverrone

Showing 2 responses by jea48

The actual insulation around the wire itself is Teflon... I think the blue outer sleeve is PVC.
Not from my experience. The outer jacket is Teflon and the insulation around the wire is PVC. It is the outer jacket of the cable that is plenum rated.

In the case of Belden they stopped using Teflon for the outer jacket of their plenum rated cable years ago. Belden developed their own outer jacket material. It is called Flamarrest®.
Outer Jacket Trade Name Outer Jacket Material
Flamarrest® LS PVC - Low Smoke Polyvinyl Chloride

//

That said, this was just meant to be an experiment to see what I think about multiple solid gauge conductors, separately insulated and braided together to form larger conductors. I’ll probably do something similar out of 20 or 18 gauge 600v wire. Any recommendations? OCC or the like would be nice.

There are quite a few cable company manufactures that make after market power cords for audio equipment that use multiple paralleled individually insulated solid core wire for each of the two current carrying conductors of their cords.

Examples of aftermarket power cords using multiple insulated solid core conductors.

PS Audio
http://www.audioadvisor.com/prodinfo.asp?number=PSPWAC5

Pangea Audio AC 9SE MKII Signature Power Cable
http://www.audioadvisor.com/prodinfo.asp?number=PGAC9S2

Audioquest
https://www.crutchfield.com/S-wi4RnpruA6y/p_703NRG23F/AudioQuest-NRG-2-3-ft.html

Shunyata
METALS AND CONDUCTORSCCC
- COMPUTER CONTROLLED CRYOGENICSPROPRIETARY PROCESSESVTX™
 ConductorsShunyata Research’s exclusive VTX™ conductors are made in the shape of virtual tubes. The core of the conductor is completely hollow minimizing skin effects and random eddy currents. They are produced using OFE Alloy-101

http://www.shunyata.com/images/technical_features/pdfs/pwr_tech_201509.pdf
Not sure of their actual construction design. I couldn’t find any actual pictures.

Note in all cases the outer protective insulation covering the hot and neutral conductors/wires is PVC and rated for mains power handling applications.


toddverrone OP 121 posts                                             02-20-20172:26pm

@jea48
check this:

http://www.southwire.com/ProductCatalog/XTEInterfaceServlet?contentKey=prodcatsheet393

That is the wire I used. The outer jacket is high temp smokeless PVC and the individual wire insulator is FEP or what is commonly referred to as Teflon. I promise I did my homework
It’s good the outer jacket of the cable is PVC . At least for the way you are using the cable it gives a little better physical abuse protection.

Yes, it says the insulation cover for each 24 gauge wire is FEP. Though if you scroll down the page it says the insulation is thermoplastic, which is PVC. I wonder if it is thermoplastic with a layer of Teflon over that?

toddverrone OP 121 posts                                      02-20-2017 10:39am

I promise, if you do the research you can confirm, cat 5 that is UL listed is rated to 300v

Yes, you are correct. But at very low amperage, rated in ma. Example, the ringer voltage on a telco phone system. The voltage on the ringer circuit can averages around 90 volts AC. It can go as high as 140Vac, possibly 150Vac. But the current is very low in the ma range. The circuit is also fuse protected which limits the current.

Again the cat5e cable was never designed/tested/manufactured/UL Listed to be used as a mains 120Vac power cord. If for what ever reason the cord faulted the current available from your electrical panel could be in the hundreds of amps before the branch circuit breaker could react and hopefully trip open breaking the fault. Will all the paralleled #24 gauge wires survive the event? What limiting fuse protection do you have to protect the parallel 24 gauge wire of the power cord?
If the fault is an arcing fault the breaker will never trip as long as the continuous current draw is below the breaker handle rating. Of course the same is true for any power cord. One reason for NEC code AFCI (Arc Fault Circuit Interrupter) branch circuit protection.

Bottom line..... You feel safe with the power cord you have assembled. The PVC outer jacket on the cat5e helps. I personally would not build a power cord using cat5e data cable. I would also not recommend anyone reading this thread do so either.
.