Designer69
Senior Member
Hi I have run into a problem that will probably cost me some money from my salary so I was wondering if anyone here might have quick-fix solution I hadn't thought of..
5 terminal units w/ box fans and electric heating coils were supplied at 208/3ph but due to a coordination problem I had wired them on the dwgs to 480V/3ph panels.
there is not enough capacity to re-wire them to 120/208v panels since the dry-type xfmr for those would be undersized to handle the combined load of roughly 50KW.
although the fans alone can be rewired to 120/208 panels since they are minimal loads (1/3hp each), however the elec. htrs are the prob. they amount to most of the load which again is around 50kw.
the best quick fix solution we have so far is to disable the elec. htrs on the TU's, wire the fans to 208 panel and order new duct mtd elec. heaters rated at 480V and install them down stream.
I spoke to a rep from Titus and he said they would probably work at 277V.
any way to get 277V/3Ph from a 277/480V/3ph panelboard?
appreciate it.
5 terminal units w/ box fans and electric heating coils were supplied at 208/3ph but due to a coordination problem I had wired them on the dwgs to 480V/3ph panels.
there is not enough capacity to re-wire them to 120/208v panels since the dry-type xfmr for those would be undersized to handle the combined load of roughly 50KW.
although the fans alone can be rewired to 120/208 panels since they are minimal loads (1/3hp each), however the elec. htrs are the prob. they amount to most of the load which again is around 50kw.
the best quick fix solution we have so far is to disable the elec. htrs on the TU's, wire the fans to 208 panel and order new duct mtd elec. heaters rated at 480V and install them down stream.
I spoke to a rep from Titus and he said they would probably work at 277V.
any way to get 277V/3Ph from a 277/480V/3ph panelboard?
appreciate it.