Neutral Sections are provided to isolate different phases of power supply in adjoining OHE fed by adjacent substations, which are normally connected to different phases of supply. Short Neutral Section Assembly PTFE Type. • Short neutral section is light weight contact wire insulator of composite type (Resin bonded glass fiber core protected with wear resistance ceramic beads) with Poly Tetra Fluro Ethylene, known as PTFE as shown in figure 1. These should be as per RDSO,s drg. No. (i) ETI/OHE/SK/551- Arrangement of neutral section for conversion with short neutral section. (ii) ETI/OHE/SK/552- Arrangement of short neutral section at existing feeding post. • Speed of trains under such neutral section assembly is 200 kmph. • This assembly has advantages of ease of installation even on flat curved locations and substantially reduced maintenance. • The lengths of PTFE type neutral sections are 9.0 m, 5.0 m and 3.736 m. Locations NS 400 m 200 m i. PTFE type short neutral section is erected on level tangent track, flat curves and difficult locations. ii. The stagger of short neutral section is zero at support. iii. The PTFE type short neutral section is located on track at a distance of at least 400 meter, after the stop signal and 200 meter before the stop signal as shown in figure below. Maintenance 1 a. Check any cracks on anti- torsion tube to messenger clamp. b. Check free movement of telescopic anti- torsion tube. 2 a. Check earthing lug for any flash mark and loose connections etc. b. Ensure that earth wire is provided with lug. 3. a. Check ceramic beads for any crack. b. Clean carbon deposits under ceramic beads by wiping with cotton cloth soaked in petrol. 4. Check clearances between: a. Arcing horn and arc catcher (horizontal clearance maximum 320mm). b. Arc catcher and ceramic bead (vertical clearance minimum 170mm). 5. Check burning of arc traps and arcing horns. 6. Check complete bracket of PTFE for any abnormality. 7. Check flash marks on structure bond connected between PTFE mast and rail. 8. Measure earth resistance twice in a year, it should be less than 10 Ohms.