Each country has its own electrical wiring code so it depends where the question comes from.
Check the national electrical code. See the link below.
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The grounding of all electrical equipment is very important. So much so that it is an electrical code rule required in any electrical installation.
Different colours mean different things in different countries, but in the UK remember Mr Brown is a live wire.
Check the national electrical code. See the link below.
It is a electrical code rule taken from the National Electrical Code book. It has to do with multi wire branch circuits.
Wire gauge capacity is taken from a table in the electrical code book.
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Beats me, the National Electrical Code does not list a #9 awg wire.
The grounding of all electrical equipment is very important. So much so that it is an electrical code rule required in any electrical installation.
The utility company is not governed by the electrical code and wire sizing. They use the reasoning that they are on call 24 hours a day 7 days a week. If there is a problem of a wire burning off due to overloading from under size wire, they will come and replace it, no charge to the customer. A contractor can not give this guarantee. He is governed by the electrical code for wire sizes and by the electrical inspector for approval of his installations.
The minimum size wire that can be paralleled together stated in the electrical code book is a #3 copper conductor.
Different colours mean different things in different countries, but in the UK remember Mr Brown is a live wire.
The amperage ratings for wire, that electricians use, are found in the electrical code book. For Canada the book is the Canadian Electrical Code and for the US it is The National Electrical Code book. Sections of these books might be found on line using these titles.There are calculations for the amperage rating that a wire is given that involve many inputs that include cross sectional area, diameter and length. If you want to give it a try, see related links below.
NO!!! It's not only unsafe, it's also against the electrical code regulations.