TRACTION AND AUXILIARY EQUIPMENT Clause Samples

TRACTION AND AUXILIARY EQUIPMENT. 3.1. Electrical components installed on the trolleybus shall be protected against over- voltage and short-circuit current. The protection shall preferably be assured by current-breaking apparatus that are reset automatically, remotely or manually. 3.2. Electrical components shall be protected against commutation or atmospheric over-voltage. 3.3. Current-breaking apparatus shall provide interruption of particular damaged circuits. 3.4. If any circuit includes single current-breaking apparatus, it shall be installed in the positive wire of the circuit. 3.5. All electrical circuits and circuit branches shall be of dual wiring. The trolleybus body can be used for current return grounds only for low voltage electrical circuits. 3.6. Battery cases, accumulator covers and battery compartment trays shall be made of non-flammable or self extinguishing materials. 3.7. Electrical components energized by the trolley line voltage shall have additional insulation from the body and transmission. 3.8. Electrical components with exemption of traction resistors shall be protected against penetration of moisture and dust inside the body and on insulated and current conducting parts. 3.9. At rated climate conditions for dry and clean trolleybus insulation resistance of electrical circuits when all rotating machines and apparatus are switched on shall not be less than: (a) body to high voltage electrical circuits 5 MΩ (b) high voltage electrical circuits to low electrical circuits 5 MΩ (c) body to positive pole of low voltage electrical circuits 1 MΩ 3.10. Wiring, cabling and apparatus 3.10.1. Only multi-line wires shall be used for high voltage circuits. All high voltage DC wiring shall have insulation rated for 3,000 V DC or AC. 3.10.2. Mounted wiring and cabling should not be stressed mechanically. 3.10.3. Wiring insulation shall not propagate burning. 3.10.4. Wiring of different voltages shall be mounted separately. 3.10.5. Cabling conduits shall be made of non-flammable material. 3.10.6. Cabling tubes located under the floor shall exclude propagation of water and dust. 3.10.7. Cabling and wiring located under the trolleybus shall be inserted into conduit protecting against water and dust. 3.10.8. Fastening and arrangement of wiring and cables shall exclude damage (fraying) of insulation. Grommets of elastomeric material shall be provided at points where wiring penetrates metal structure to exclude insulation damage. Radius of bound tubes containing wiring shall be five ex...