ok, here is a small taste of one of the many cabinets i've been working on. today i started on this one. it's a 40 ckt (circuit) heat trace panel that requires 208v(olts). there are 40 ckts dedicated to the heat tracing, which by the way is where a pipe has to be heated to whatever temperature for whatever reason, this panel controls the temperature via the heating elements and the RTD's (resistance temperature detection). first thing is to take the drawings for the panel and check the BOM or bill of material. next make sure everything is mounted where it's supposed to be and the right parts were used. next is making sure that the equipment is tight and snug. after that you do a point to point wire inspection and ohm them out to make sure all connections are correct and that the termination points are not frayed. then you take make shift RTD's and insert them into the RTD terminals as seen on the left side of the panel. the fake RTD's are the maroon looking thingamabobs. after that, hook up service power and power up the panel load the applicable software and test every heat trace circuit. after all checks out and problems fixed, remove fake RTD's, heat shrink the wire tags, blow shop air throughout the panel then vacuum out the bottom basin. done.
in most cases. this panel has not only an air conditioner (on the right side panel) but also has what's called purge air. what that is is this: the panel is going in a hazardous location. ie there are flammable gases present so they hook the panel up to an air line and have positive pressure in it to prevent any of the ambient outside air to enter the enclosure.
i like my job.
