Working with the 250-3 EPR CPE Cable
The 250-3 EPR CPE is a W/GRND tray cable that comes with FR-EPR flame retardant insulation, made of ethylene-propylene rubber. Now, this is not just any ordinary specification as it complies with ICEA and UL requirements. It has conductors made of copper, which is Class B, stranded and tinned. Now the main specialty of this cable is that it is flame retardant and you can even get it ordered to be more efficient by getting it with a jacket that is also flame retardant, low smoke and zero halogen. Perhaps, this may not be your usual cup of tea, but when it comes to wiring, it is best to not settle for anything but the best.
Copper cables may sometimes come with a heavy price and people opt to buy aluminum cables at that time. The reason is that the copper industry has a very volatile output and if one has the time, one can wait for copper prices to go down. However, most of the time, people cannot wait for long and if you do not want to compromise, then buy the copper cables regardless of the price tag. Moreover, copper is the preferred material for residential purposes and so if you want to rewire your house, then choose copper.
However, this does not limit the 250-3 EPR CPE for residential purposes alone as this cable can be used for hazardous locations and can be used in wet locations as well as for underground systems. They can be used for power distribution, general wiring and raceways. Most often, the voltage rating has to be around 600V but there are cables that can serve even 2kV. Also, the insulation is abrasion resistant, so you can use these in applications that take a lot of beating from general and constant use.
The temperature ratings for the cables are determined by the insulation and the jacket provided. So if you want the cable to be used in more extreme temperatures, then the material should have passed the industry required tests. You can also get listings for cold temperatures such as -200C to -700C if the cables pass the cold bend test at the given temperatures. However, the cold bend testing is not as harsh as the cold impact testing, but they get the job done. However, all that the buyer has to be aware of is the requirements for the job and check whether the cable has the necessary markings.
Some of the standards that you can further look out for are NEMA, ASTM, VW-1 rated and IEEE ribbon flame test. These tests are done to make sure that the cable is up to any task that you give it and that it can handle any kind of environment, be it dangerous or domestically safe. Not all electrical engineers might give you the insight into the cables and that is why it is essential to find out for yourself as much as you can before taking the cable into your hands.