It's been a week and as the QotD is usually a week for students, I'll
throw in my thoughts.
1) If you are not the person designated and/or the person with the skill and authority to do tie-ins, politely inform the event electrician that you will get the correct person to do the
tie-in. You work for the
house, so follow the rules of the
house.
2) Double check that the person that handed you the
tails is the person with the event that actually knows what kind of
power they need. Verify what they need.
3) Verify that the
tails being provided are color coded correctly for the event equipment. If in doubt, have the person from the event
hand you a Hot when asked, then another Hot, then the
Neutral then the
Ground. This way the event personnel are responsible for their own gear if they were in error. Big red caution lights go off in my head when I see
Cam-Lok connectors that are covered in vinyl colored tape of a different color then the Cam color, makes me ask WHY ?.
4) Connect as per color once all concerns are addressed, or connect as per the event electricians direction. If something seems amiss, be prepared to
meter the
tie-in at the
tails.
5) If the blue is not used, either cap it or if no capability to cap exists, open up the
company switch and remove the blue feed
wire from that
phase lug. If the
switch has live wires,
switch off at the appropriate
breaker, lock and tag prior to working in the
disconnect. If the blue
tails wire is
bundled,
mark it with a "Not Used and Connected" flag, white 2"
gaff would be my choice.
In truth, I run into this all the time with audio gear and simply cap the non-used tail. If it's a
one-off I rarely
mark it (my bad) as I'm the only electrician dealing with the
tie-in.