Sistimi ea terata e 3 e sebelisoang terateng ea sefate kapa thapo ea spacer, e entsoe, ea lekoa le ho tšoauoa ho latela ICEA S-121-733, e leng maemo a Tee Wire le Messenger Supported Spacer Cable.Sistimi ena ea 3-layer e na le thebe ea conductor (layer #1), e lateloe ke sekoaelo sa 2-layer (layers #2 le #3).