Marine@360
Member
- Location
- Philadelphia
- Occupation
- Electrical Designer
We utilize 440/120V, 3PH, 3W ungrounded systems on board the vessels, will a GFCI receptacle or circuit breaker function properly with (2) 60V conductors?
GFCI
- Thread starter Marine@360
- Start date
- Location
- New Jersey
- Occupation
- Journeyman Electrician
How do you derive 120 volts from 440 volts?
Marine@360
Member
- Location
- Philadelphia
- Occupation
- Electrical Designer
Transformer
Marine@360
Member
- Location
- Philadelphia
- Occupation
- Electrical Designer
I would like to insert a diagram but I do not know how to insert a PDF
ramsy
NoFixNoPay Electric
- Location
- LA basin, CA
- Occupation
- Service Electrician 2020 NEC
If vessel electrical generators operate > 60Hz, no sure if GFCI outlets are listed for it.
hillbilly1
Senior Member
- Location
- North Georgia mountains
- Occupation
- Owner/electrical contractor
An alternate path is required for a gfi to work. So if the system is ungrounded, where would the alternate path be? Unless it is to another circuit.
ramsy
NoFixNoPay Electric
- Location
- LA basin, CA
- Occupation
- Service Electrician 2020 NEC
If compatible GFCI devices exist for 120D/60V systems, requirements are usually adopted from ABYC regulations.
If installed in a head, galley, machinery space, or on a weather deck, the receptacle shall be protected by a Type A (nominal 5 milliamperes) Ground Fault Circuit Interrupter (GFCI).
Carultch
Senior Member
- Location
- Massachusetts
Take a screenshot of the relevant sections of the diagram. You can embed most standard image formats.
If you want to upload a spreadsheet to support a question, I recommend uploading it on Google Sheets, and linking it.
kwired
Electron manager
- Location
- NE Nebraska
- Occupation
- EC
Yes. It won't care what or if there is a ground reference, all it will care about is having sufficient supply voltage for the electronics and then whether the current going out on one conductor is equal to the current coming in on the other.
I've seen typical GFCI receptacles applied (by someone that didn't know what they were doing) with 240 volts (they did know they were using 240 volts and were using it for a 240 volt power tool) and it still functioned, so apparently applied voltage isn't a big thing, though I'm sure there is going to be some insulation breakdown limit eventually. Not sure what say 400 Hz may do though.