SINGLE-MODE FIBER - An optical waveguide in which only one mode propagates due to its small core diameter of approximately 9 microns.
SINTERED - Usually refers to curing of PTFE. To cause to become a coherent mass by heating without melting.
SIS - XLP (cross-linked polyolefin) switchboard wire.
SJ - 300 volt junior service rubber insulated UL approved portable cord, rubber jacket. 18 AWG two conductor through 16 AWG four conductor.
SJO - 300 volt junior service rubber insulated UL approved portable cord, Neoprene® jacket. Neoprene® is a trademark of the DuPont de Nemours Co.
SJT - 300 volt junior service vinyl insulated UL approved portable cord, vinyl jacket.
SJTO - 300 volt. Same as SJO except all thermoplastic construction.
SKELETON BRAID - Widely separated braid of fiber, copper, or steel may be used to hold core together, for reinforcing jacket or for shielding.
SKIN EFFECT - In an alternating current system, a phenomenon that occurs at increased frequencies causing an increase in resistance of the conductor causing the outer skin to carry most of the current. The phenomenon increases in intensity the higher the frequency.
SLEEVING - A braided, knitted, woven tube.
SNCCS - Abbreviation for silver-covered nickel-covered copper-clad steel.
SO - A 600 volt senior service Neoprene® jacket UL approved portable cord; 18 AWG two conductor through 10 AWG four conductor. Neoprene® is a trademark of the DuPont de Nemours Co.
