300 Volt wire vs 600 Volt wire

Reply

  #1  
Old 10-04-18, 03:03 PM
Member
Thread Starter
Join Date: Oct 2018
Location: USA
Posts: 1
300 Volt wire vs 600 Volt wire

Hi, looking for some electrical insights.

I am replacing my forced air AC and gas furnace with three ductless heat pump split systems.

Each system has multiple air handlers and runs on 20 amp circuits. So in other words, I need to have four 20 amp circuits.

I am hoping to re-use the cable and breaker for the existing AC circuit. It is comprised of a 50 amp breaker connected by a 6 awg AL cable that is rated for 300 volts (not 600 volts).

I had planned to run the existing circuit to a new sub-panel, where I would install three 20 amp breakers. From that sub panel I would run 12 awg copper to each system.

Here is my question:
1) Is the existing cable, rated for 300 volts, sufficient - or do I need to replace with a 600 volts cable? (each system runs on 230 volts)
2) Can I run three systems with MFA of 20 amps on a 50 amp breaker?

Thanks, Mike
 
Sponsored Links
  #2  
Old 10-04-18, 04:08 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 45,583
Welcome to the forums.

Can I run three systems with MFA of 20 amps on a 50 amp breaker?
Hmmmm....... that would be close. If that was copper I'd say fine. Being aluminum.... it may be borderline. As long as two didn't try to start at the same time.... it should be ok.
300v rated wire is fine.
 
Reply

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
Display Modes