As 411A mentions here, correct.
Regarding the 727 accident - UAL 1969 off Santa Monica...
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Was one of our favorite classroom subject for F/Es then.
The plane had been dispatched with 1 GEN INOP.
It was a 727C or was not, but here was a slight difference between the two.
Battery switch and galley power switch next to each other.
Both switches were NOT GUARDED.
NOTE - After the accident, all airlines installed a GUARD on the BAT switch.
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They got down to ONE GEN operating - it tripped, overload.
The flight engineer intended to switch galley power OFF.
He confused the two switches, and got the BAT switch OFF.
Cockpit became dark, nothing electrical operating.
In these days there was NO standby attitude indicator SAI.
NOTE - After accident, all airplanes got requirement for SAI with battery.
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A part of the story I got from a UAL pilot... is it a legend...?
Apparently, SAI equipment had been offered for UAL airplanes as option.
But would have cost a lot of money. So they said NO.
Daughter of the UAL idiot that decided not to install SAI, was a F/A aboard.
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Happy contrails