alaskanassassin
Member
- Location
- Fairbanks, Alaska
Can anyone explain why the manufacture would recommend #8 conductor for installation. I came calculated 22 amps. Why would they recommend #8? Thanks Doug
Sizing conductors for 480VAC and 15KW heater
- Thread starter alaskanassassin
- Start date
- Status
kwired
Electron manager
- Location
- NE Nebraska
- Occupation
- EC
is it single phase or three phase? single phase would require #8.
RETRAINDAILY
Senior Member
- Location
- PHX, arizona
15000w/480v=31.25amp
alaskanassassin
Member
- Location
- Fairbanks, Alaska
It is one heater and three phase. It will be located ten feet from the feed.
SG-1
Senior Member
- Location
- Ware Shoals, South Carolina
One possibility is the device itself could require an oversized conductor to dissipate heat from it's terminals without exceeding the conductor temperature limits. Since it is so close to the source, you may want to check the temperature of the breaker terminals to ensure they do not exceed 75 degrees C after 3 or 4 hours of run time.
RETRAINDAILY
Senior Member
- Location
- PHX, arizona
424 i & ii
424 i & ii
424.3 (b) 424.11
424 i & ii
424.3 (b) 424.11
dmagyar
Senior Member
- Location
- Rocklin, Ca.
single phase or 3 phase
single phase or 3 phase
Looks like a goof on their part, unless it's a single phase heater, but rare. Amperage=KVAx1000/E ; 15000/480=31.25 X125%=39.06 amps
In three phase it's Amperage=KVAx1000/E x 1.73, 15000/(480*1.73)=15000/830.4=18.06 X 125%=22.57 amps
single phase or 3 phase
Looks like a goof on their part, unless it's a single phase heater, but rare. Amperage=KVAx1000/E ; 15000/480=31.25 X125%=39.06 amps
In three phase it's Amperage=KVAx1000/E x 1.73, 15000/(480*1.73)=15000/830.4=18.06 X 125%=22.57 amps
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