Three feet clearance is needed in front of electrical service equipment.
120v or 240v. 120v is one leg of the main panel, and 240 is two legs of the main panel. 120v is lights,outlets. 240v, dryer,stove.
I don't know if you are trying to ask if you can run a 240V panel off a GFCI or run a 120 V sub panel off of a GFCI. Can you clarify please,,,Thanks
Junction box for what? Do you mean a sub panel?
if i have a breaker that has a 120/240v and my dryer has a 240v plug can i change the receptacle to a 240v
You don't. Electric devices like outlets have voltage and current ratings that should not be exceeded. Also, the 240V would have to be run from the main panel and may require a different size wire depending on the current required.
120v or 240v. 120v is one leg of the main panel, and 240 is two legs of the main panel. 120v is lights,outlets. 240v, dryer,stove.
In North America it takes two "hot" wires to obtain 240 volts.
there isnt a high leg in a three phase 480v panel only on 240v panels
I don't know if you are trying to ask if you can run a 240V panel off a GFCI or run a 120 V sub panel off of a GFCI. Can you clarify please,,,Thanks
Junction box for what? Do you mean a sub panel?
Whatever the market will bear. If a guy is charging too much, get someone else. The real issues are things like accessability and how much space is in your breaker panel and how large is the electric service into the house. If your breaker panel is full and you need more space the electrician may need to put in a larger panel. Too many questions, not enough information to answer your original question. Sorry.
240V appliances, such as range, dryer, air conditioner.
if i have a breaker that has a 120/240v and my dryer has a 240v plug can i change the receptacle to a 240v
You don't. Electric devices like outlets have voltage and current ratings that should not be exceeded. Also, the 240V would have to be run from the main panel and may require a different size wire depending on the current required.
First off, this is for a single phase 120/240V system only. The ground and neutral can be bonded at the receptacle but not instead of bonding them at the panel.You should always have them bonded together at the panel in a single phase 120/240V system. Otherwise you risk having a floating neutral in your system.
240 volts require 2 poles on a panel - 120V each pole - so the answer on "how" is that you can't.
A 220V should be grounded like every other fixture, through a green or bare wire to the neutral bus in the main panel.