3ph Conductor Rail GFCI required?

[carlvant2004]

I have seen in the field where a floor mounted 208VAC 3ph 100A conductor rail was supplied by a OCPD with a shunt trip connected to a ground fault monitor set at 30mA. The feeder is solidly grounded wye. Is this required by the NEC or other industry standard(s)? I cannot find any standard that requires this configuration.

 

[barbeer]

I do not know what a "conductor rail" is.:-?

 

[Dennis Alwon]

I do not know what a "conductor rail" is.:-?

This is what I found

Conductor Rails are electrical conductors of varius profiles that are used to provide electrical potential to moving systems along a path of travel. Conductor rails are mobile..

 

[ultramegabob]

I do not know what a "conductor rail" is.:-?

never heard of a conductor rail either, is it somthing like a buss system maybe?

 

[ultramegabob]

This is what I found

Quote- "Conductor Rails are electrical conductors of varius profiles that are used to provide electrical potential to moving systems along a path of travel. Conductor rails are mobile"..

.........................................................................................................


like an overhead electrical crane in a factory?

 

[jim dungar]

I have seen in the field where a floor mounted 208VAC 3ph 100A conductor rail was supplied by a OCPD with a shunt trip connected to a ground fault monitor set at 30mA. The feeder is solidly grounded wye. Is this required by the NEC or other industry standard(s)? I cannot find any standard that requires this configuration.

I know of now standard that requires GF protection like you describe (208V 100A 3PH). I believe this is a design issue only.

Also in your title, GFCI are specific devices that provide people protection at a 5mA trip point. Do not confuse GFCIs with other ground fault devices.

 

[carlvant2004]

Thanks for the correction. The ground fault monitor is adjustable. At its current setting, it does not meet the definition. The definition is actually to trip at 6mA or above and not less than 4mA (FPN Article 100). I believed that the original intent was for personnel protection because the rail is mounted on the ground. The actual conductor rail is made by Wampfler (0831)

http://www.wampfler.com/index.asp?id=10&plid=26&e1=2&e2=7&prid=30&lang=E

 

[jim dungar]

Thanks for the correction. The ground fault monitor is adjustable. At its current setting, it does not meet the definition. The definition is actually to trip at 6mA or above and not less than 4mA (FPN Article 100). I believed that the original intent was for personnel protection because the rail is mounted on the ground. The actual conductor rail is made by Wampfler (0831)

http://www.wampfler.com/index.asp?id=10&plid=26&e1=2&e2=7&prid=30&lang=E

A GFCI trips based on a specific time vs current curve. I find it unlikely that a stand alone relay controlling a shunt trip mechanism would meet the correct timing for personnel protection. But, I can agree with the intent to provide at least some type of GF protection.