@adarshmohanty where are you located that they are still using aluminum wiring? There are so many issues with aluminum wiring due to the expansion and contraction of the aluminum during peak power usage. There are also issues with heat, resistance and corrosion if it gets connected to copper terminals.
From your question, it looks like your household voltage is in the 220V range. 5000W/220V=23A (22.7) Now add a safety factor of 1.25 to it and you get 29A (28.75). So your wire needs to have an ampacity of around 30A.
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For my area of the world, that would mean I would need a #10AWG wire. That (in copper) has a cross section of 5.26mm so that would be a 6mm for your purpose. Your 8 sq mm falls between a 10AWG and an 8AWG from [https://www.lapptannehill.com/resources/technical-information/metric-to-awg-conversion-chart|here]
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For my area of the world, that would mean I would need a #10AWG wire. That (in copper) has a cross section of 5.26mm so that would be a 6mm for your purpose. Your 8 sq mm falls between a 10AWG and an 8AWG from [link|https://www.lapptannehill.com/resources/technical-information/metric-to-awg-conversion-chart|here]
It'll work but I'd go bigger if available.
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This "Is this still because of the aluminium cable or is it normal to get low voltage around this time since its peak summer time now" we really can't answer. We do not know what your power company supplies. I would imagine that they are having difficulty supplying sufficient power to the population during peak season.
@adarshmohanty where are you located that they are still using aluminum wiring? There are so many issues with aluminum wiring due to the expansion and contraction of the aluminum during peak power usage. There are also issues with heat, resistance and corrosion if it gets connected to copper terminals.
From your question, it looks like your household voltage is in the 220V range. 5000W/220V=23A (22.7) Now add a safety factor of 1.25 to it and you get 29A (28.75). So your wire needs to have an ampacity of around 30A.
For my area of the world, that would mean I would need a #10AWG wire. That (in copper) has a cross section of 5.26mm so that would be a 6mm for your purpose. Your 8 sq mm falls between a 10AWG and an 8AWG from [https://www.lapptannehill.com/resources/technical-information/metric-to-awg-conversion-chart|here]
It'll work but I'd go bigger if available.