I am not an electrician. I do hook-up DC powerplants at cell sites. We wire up to 8 rectifiers to provide power for -48VDC powerplants thru liquidtight. My question is that sometimes these are pre-wired with a ground wire for each rectifier circuit and sometimes only 1 per conduit. Which is correct? Does it matter if it's metallic liquidtight? Is the length limit 6 ft.? Thanks for any help!
Liquidtight # of grounds required
- Thread starter 5etester
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Check Article 351 or whatever they changed it to in later editions. In general, you only need one ground conductor in a conduit [at the size of the largest required ground wire]. The 6' rule is an exenption which allow you to eliminate the ground wire in flex, etc. if it is shorter than 6' but it is better to include the ground wire.
~Peter
~Peter
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
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- Electrical Contractor
In addition to the 6' limit, the flex connectors must be listed as suitable for use as a grounding pathway, to avoid having to use a conductor.
Follow-up question
Follow-up question
Thanks for the feedback. I just wonder about the role of the ground wire. For example, normally the conduit contains eight 10 guage wires for 4 rectifiers on a shelf. Should the single ground wire be sized to carry the load of all 4 rectifiers back to the neutral buss if there were an event like severing the cable? Only one 10 guage ground is often used. And sometimes we see this in non-metallic liquidtight.
Follow-up question
Thanks for the feedback. I just wonder about the role of the ground wire. For example, normally the conduit contains eight 10 guage wires for 4 rectifiers on a shelf. Should the single ground wire be sized to carry the load of all 4 rectifiers back to the neutral buss if there were an event like severing the cable? Only one 10 guage ground is often used. And sometimes we see this in non-metallic liquidtight.
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