A “dead front” switchboard is one _____.

The number of phone calls arriving at a switchboard each hour has been recorded and the following frequency distribution has been developed. Class Interval Frequency 20-under 40 30 40-under 60 45 60-

The voltage meter and current meter on the main switchboard shows ( <br/>). A: phase voltage and phase current of generator B: line voltage and line current of generator C: line voltage and line current of crane D: line voltage and line current of shore power