Power to shed

[Revans]

https://www.reduceimages.com/download.php?image=96863db543

Trying to power a shed....the pic shows circuit coming from house. Cannot tell what circuit these wires are on....can I turn off main breaker and then safely make the connection from thr house to the shed
Thanks

 

[Snoonyb]

Welcome.

Since the hot (black) conductor and the grnd. (bare copper) are connected in the same wirenut, you need to do some more investigation.

 

[Revans]

That’s the line going to the shed....no power....I put a wirenut on them for protection.
The black and white wires are ‘live’, but I can’t determine what circuit they’re on...don’t want to strip them to get more bare wire for a multimeter...can I turn off the main breaker and join the wires from the house to the shed..safely?

 

[JoeD]

You can do that but you need to determine which breaker they are on. They won't be connected directly to the main.

 

[Snoonyb]

If you have the grnd. and the hot connected in a single wirenut, and you haven't tripped a breaker, something is defiantly wrong and you need to correct that before you proceed.

If you are not familiar with working behind the dead front panel, hire an electrician.