# Power systems unclear voltages

I was looking at this problem:

"A balanced delta connected impedance load with (12+j9)Ω per phase is supplied by a balanced three-phase 60 Hz, 208-V source "

I do not wish to ask for help at solving this, rather, I want to know how to interpret the "208 V source" statement. If someone gives me that statement I will immediately think it means
$$V_{an} = 208 V \angle 0º$$ and we can just get $$V_{bn}$$ and $$V_{cn}$$ by adding $$\angle +240º$$ and $$\angle +120º$$ respectively.

However I have seen people interpreting this as $$V_{LL} = 208 V$$, what reason do they have to conclude it refers to LL and not LN, the problem does not sate it.

• Normally, unspecified voltage three-phase voltage is considered to be LL. But this depends on individual. Nov 30, 2021 at 21:19

Note the problem specifies the load is "delta connected". There is no neutral connection to measure phase voltage ($$V_{LN}$$) against.
Also note the supply frequency is 60 Hz. 208 V is a common line voltage ($$V_{LL}$$) in the US (which uses a 60 Hz supply), with corresponding phase voltage of 120 V. You are using a US text (Sarma et al, from another post) so you can expect to see examples of US practice.
So the problem is asking about $$V_{LL} = 208 V\;$$.