5A Junction box

JDW: 
 

Are 5amp junction boxes acceptable on a 6amp lighting circuit?

I personally wouldn’t use them as they are too small, but if they are already fitted are they acceptable? 

Is it actually possible to overload them?

It wouldn’t be in my house, my lighting circuit loads are less than one amp.

JDW: 
 

Are 5amp junction boxes acceptable on a 6amp lighting circuit?

I personally wouldn’t use them as they are too small, but if they are already fitted are they acceptable? 

Is it actually possible to overload them?

It wouldn’t be in my house, my lighting circuit loads are less than one amp.