Standard of equipment design is 220 V, 50 Hz, 35 degree celsius , as every electronic item is designed on one standard however while designing it is considered that 20% +- fluctuation will not affect the useful life of the equipment.

In Asian Countries Electricity is not stable as downgraded from high AC voltage to Low AC Voltage. In summer when electricity consumption is more voltage fall from 220V to 180 V and in winter when electric consumption is low voltage go to 255 to 290 volts.

Stabilizer can maintain the electricity from 250 v to 220 v and same from 200 v to 220 v if variation is less or more it would trip and AVR maximum range to trip is 300 volt. In Asian countries recommended is AVR as voltage of wapda goes beyond 300 v

If weather is not stable then it would need settings of module to maintain required temperature inside chamber. This problem is also in other brands of conveyor oven however those products is not energy efficient.

Yes

Accessories are not provided as most of the time Standards did not fit on customised requirements and others customers may get better warranty on their location