magdyfayad
Member
frequently , i hear this statement " do not care for AC connection but must care for DC connection "
who say this statement wants to connect " L " terminal and " N" terminal any connection for AC connection , but for DC it must connect the positive terminal to a certain terminal and the negative terminal to a certain terminal
but i have some questions :
1- if this statement is correct , why the devices which worked by AC marked their terminal by " L" & " N " ??
2- what happen for AC devices if i reverse the connection for " L" & " N " ?? I know if the ground is connected to the nuteral and when i reverse the plarity , then the body of this device will be have a voltage , is there any thing more ?? i.e : if i reverse the polarity for AC devices , they also work , or not work , or damage ?? or different from some devices to another and what is the difference ??
3- the contactors either operate by AC or DC , we do not care for their connection , as if i reverse the connection for " L " & " N " or for " +ve " & " -ve " the contactors will also work , which means the statement is not always right , am i correct ??
4- when i must care for the connection for both AC & DC devices ?? what is the theory for this ??
thanks in advance
who say this statement wants to connect " L " terminal and " N" terminal any connection for AC connection , but for DC it must connect the positive terminal to a certain terminal and the negative terminal to a certain terminal
but i have some questions :
1- if this statement is correct , why the devices which worked by AC marked their terminal by " L" & " N " ??
2- what happen for AC devices if i reverse the connection for " L" & " N " ?? I know if the ground is connected to the nuteral and when i reverse the plarity , then the body of this device will be have a voltage , is there any thing more ?? i.e : if i reverse the polarity for AC devices , they also work , or not work , or damage ?? or different from some devices to another and what is the difference ??
3- the contactors either operate by AC or DC , we do not care for their connection , as if i reverse the connection for " L " & " N " or for " +ve " & " -ve " the contactors will also work , which means the statement is not always right , am i correct ??
4- when i must care for the connection for both AC & DC devices ?? what is the theory for this ??
thanks in advance