SK Electricians Starter Tools Meets IBEW Specifications 18-Pc. Set "tester lights touching white ground" Questions

...tester ''lights up'' in my outlet box when I touch the white common wire and black not wire with the two tester leads, as it is supposed to. However,it also ''lights up'' when I touch the black hot ...

...tester with the hot wire, if you touch 2 wires and nothing happens, assume they are white and neutral. so the last one is hot. Only in a very modern fuse box where everything is polarized, ( and you ...

...tester to check for power. When i touch the black and ground wire it lights up. when i touch the black and white it doesnt lite up. when i touched the white and ground it lit up. what does this mean? ...