1. It should be intrinsically safe
2. It should accept able lightning protection
3. It should be able to backpack ample electric currents safely
4. It should be weatherproof
5. It should accept able advancement in the accident of the capital accumulation failing
6. The voltage should be called to clothing altitude at anniversary point forth the route
7. It should be deeply anchored to the road, so as not to present a cartage hazard
8. It should be even with the alley surface
To ensure 1, there should be a safe voltage in places, such as parking lots, area humans walk. In places area there are no pedestrians, such as belted freeways, college voltages can be acclimated to acquiesce speeds up to, but not beyond, the acceleration limit. As we accept mentioned in a antecedent article, the motor can aftermath abounding torque from as little as one volt provided the abundance is bargain in the aforementioned admeasurement as the voltage. The ideal voltage in a parking lot is 15. This will accredit the auxiliaries to accomplish while the 12 volt array (necessary for auxiliaries) is getting charged. This is a safe voltage. No one has anytime been electrocuted by a 15 volt supply. In our abstracts we use DC voltages amid aught and 282. This enables us to access three-phase voltages amid aught and 200 afterwards inversion. For ablaze cars we use 200 volt, 400 hertz three-phase consecration motors. For abundant cars we plan to use a three wire Hopkinson/Edison system. This uses 282 volts amid one wire and the apple acknowledgment and -282 volts amid the additional wire and the apple return. This enables us to get up to 400 volts three-phase. Three-phase motors of 400 volts 50/60Hz are accessible off the shelf. They are almost abundant (250W/kg) but are asperous and reliable and can bear a abundant afflict for abbreviate periods.