Why on the LOAD side?

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petersonra

Senior Member
Location
Northern illinois
Occupation
engineer
http://www.grace-eng.com/ChekVolt/Ds-ChekVolt.shtml

One would think it would need to be on the line side to prove the voltage has been removed.
 

tallgirl

Senior Member
Location
Glendale, WI
Occupation
Controls Systems firmware engineer
petersonra said:
http://www.grace-eng.com/ChekVolt/Ds-ChekVolt.shtml

One would think it would need to be on the line side to prove the voltage has been removed.

The voltage isn't removed from the line side of the disconnect. Reading the product literature, it is telling you how to check for voltage when that panel's disconnects have been opened, not how to check that the disconnect for which panel is feeding that one has been disconnected.
 

jim dungar

Moderator
Staff member
Location
Wisconsin
Occupation
PE (Retired) - Power Systems
This device is being sold as a means to determine if a local disconnect is open - NOT if the power to a device is still present. Unless there are appropriate internal line side barriers NFPA 70E would consider the opening of the panel as exposing live conductors even with this device installed.
 

dlhoule

Senior Member
Location
Michigan
jim dungar said:
This device is being sold as a means to determine if a local disconnect is open - NOT if the power to a device is still present. Unless there are appropriate internal line side barriers NFPA 70E would consider the opening of the panel as exposing live conductors even with this device installed.

I agree with you Jim. In addition to what you say; what happens when one or more of the wires leading to these check points go to ground when you open door? Another very unsafe condition.:roll:
 
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