Welcome, Guest
Username: Password: Remember me
  • Page:
  • 1

TOPIC: 120 phase in 120/240 50amp

120 phase in 120/240 50amp 19 Aug 2017 17:42 #1

  • aspen1880
  • aspen1880's Avatar Topic Author
  • Offline
  • Elite Member
  • Elite Member
  • Posts: 926
  • Thank you received: 119
I understand there are 4 wires: Neutral, ground, 120, and 120.

are the two 120 wires 180degrees out of phase, similar to
the two 120 legs of a home electrical panel?

Please Log in or Create an account to join the conversation.

Novurania 335DL. 30HP. WKRP in cincinnati. Previously: Bayliner 3818 in PNW.

120 phase in 120/240 50amp 19 Aug 2017 17:50 #2

  • Ruffryder
  • Ruffryder's Avatar
  • Offline
  • Moderator
  • Moderator
  • Posts: 7639
  • Thank you received: 1418
single phase service... yes similar to
the two 120 legs of a home electrical panel?

Please Log in or Create an account to join the conversation.

Joon, Kathy, Jaden & Tristan
93 3058
92 2855
91 Fourwinns 205
Longbranch WA
Life is Good

120 phase in 120/240 50amp 19 Aug 2017 20:28 #3

  • aspen1880
  • aspen1880's Avatar Topic Author
  • Offline
  • Elite Member
  • Elite Member
  • Posts: 926
  • Thank you received: 119
if you put the VOM black lead onto one of the hot 50a wires,
and the VOM red lead onto the other hot 50a wire: does the voltage read 240
or does it read as zero?

Please Log in or Create an account to join the conversation.

Novurania 335DL. 30HP. WKRP in cincinnati. Previously: Bayliner 3818 in PNW.

120 phase in 120/240 50amp 20 Aug 2017 19:04 #4

  • johnrupp
  • johnrupp's Avatar
  • Offline
  • Premium Member
  • Premium Member
  • Mechanicsburg, PA
  • Posts: 288
  • Thank you received: 20
Yes, it is single phase 120/240 service just like your house. The two hots are 180 degrees out of phase. To test that dock is correctly wired volt meter should read 240 hot to hot and 120 either hot to neutral.
The following user(s) said Thank You: aspen1880

Please Log in or Create an account to join the conversation.

John Rupp
1989 2455 Ciera Sunbridge
5.8 OMC Cobra

1989 3288
Starshine

120 phase in 120/240 50amp 21 Aug 2017 13:51 #5

  • 2850Bounty
  • 2850Bounty's Avatar
  • Offline
  • Platinum Member
  • Platinum Member
  • Posts: 24479
  • Thank you received: 1121

aspen1880 wrote: I understand there are 4 wires: Neutral, ground, 120, and 120.


Think in terms of two legs, each @ 120 vac (often referred to as L1 and L2 or Line 1 and Line 2)
Then you'll have one Neutral ...... and one Earth Ground.

Please Log in or Create an account to join the conversation.

Rick E. Portland, Oregon
2850 Bounty Sedan Flybridge model
Twin 270 HP 5.7's w/ Closed Cooling
Volvo Penta DuoProp Drives
Kohler 4 CZ Gen Set
  • Page:
  • 1
Moderators: Jim GandeeRuffryder
Time to create page: 0.083 seconds
Powered by Kunena Forum