He said it was at a Starbucks, not really sure what is typical for them for equipment. VFD's (larger ones anyway) would most likely be on HVAC, but I could see cooking or other heating equipment possibly being solid state controlled and have some similar non linear characteristics and non linear lighting loads.
It’s exactly what you’d expect from a compact crowded little commercial kitchen. A lot of small appliances, food warmers, mini fridges, ice machine etc....No VFDs.
I’m thinking about going back there sometime during off-peak hours on my own time and investigate a little more.
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In what type of setting?
In a Mall?
In a Strip Mall?
In a Barnes and Noble Book Store?
In a ???
What is the world beyond the confines of the Starbucks?
Hello all!
Big fan of the forum, but first post.
I received a service call last week at a Starbucks from an HVAC tech concerning a breaker that was apparently “sparking really bad” when he was attempting to verify voltage in the panel for an Ice machine. I figured it was simply a loose connection. When I got there I found out the store is essentially BRAND NEW, having just been renovated and only re-opened for five days.
Now, I locate the panel of the breaker in question and hear a cacophony of erratic buzzing from this panel when I opened it. It sounded load based, coming and going quite randomly, but seemed to be coming mostly from the 2p breakers, but it was very hard to tell. I tried putting my(gloved)hand on whichever breakers I thought the buzzing was coming from, thinking maybe loose connection, but nothing. It was unnerving.
Brand new. Brand new electrical service? New electrical panel and breakers?
OR,
Existing electrical panel? Existing circuit breakers?
Aluminum bus?
My first thought when I started reading your posted message, the panel is existing, the bus is AL and a circuit breaker to AL bus connection is arcing under load due to a poor connection.
Then I listened to the sound on the video you provided in your next post. It kind of sounds like a digital repeating signal to me.