Grounding Question:
Subject: HV cubicle and space heater circuitry
We are installing a space heater in a HV cubicle and are using 120 v from an external source (Power Panel) to feed the heater. To protect the 120 v wires in the HV section we are installing a braided cable cover over them from the heaters to a piece of conduit (1/2 inch) as it entered into the HV cubicle from outside the HV enclosure
1.) How do we connect the braid to the conduit to ensure circuit conductivity of the conduit path? NEC does require that we have a path
The braid should it be clamped around the conduit and tied down with an electrical fitting.
We are also installing the green ground/bond wire with the120 v electrical circuit
2.)As we did install this green bond wire for the 120 v circuit within the HV cubicle do we need to ground it at the heater location at the enclosure side of the HV cubicle. Effectively we will have installed a green bond from the 120 Low Voltage panel into the HV section. Have we caused any problem as a current path if a HV short should occur and try to flow back to the LV PANEL?
I understand that the short should effectively stay within the HV panel as the HV section should have a minimum of 5 ohms in the ground bus, so effectively no current should pass back to the LV pane, or should see a HV on the LV ground side of the Power Panel. But is this correct in actual lessons learned
Subject: HV cubicle and space heater circuitry
We are installing a space heater in a HV cubicle and are using 120 v from an external source (Power Panel) to feed the heater. To protect the 120 v wires in the HV section we are installing a braided cable cover over them from the heaters to a piece of conduit (1/2 inch) as it entered into the HV cubicle from outside the HV enclosure
1.) How do we connect the braid to the conduit to ensure circuit conductivity of the conduit path? NEC does require that we have a path
The braid should it be clamped around the conduit and tied down with an electrical fitting.
We are also installing the green ground/bond wire with the120 v electrical circuit
2.)As we did install this green bond wire for the 120 v circuit within the HV cubicle do we need to ground it at the heater location at the enclosure side of the HV cubicle. Effectively we will have installed a green bond from the 120 Low Voltage panel into the HV section. Have we caused any problem as a current path if a HV short should occur and try to flow back to the LV PANEL?
I understand that the short should effectively stay within the HV panel as the HV section should have a minimum of 5 ohms in the ground bus, so effectively no current should pass back to the LV pane, or should see a HV on the LV ground side of the Power Panel. But is this correct in actual lessons learned