We are installing a temporary power run thought a very large building that will be stripped of Asbesto, Lead Paint, mercury..you name it... The basic set up is this....
We will use a pad mounted 500 Kva transformer (13.8 Kva / 480 volt) that is located outside of the building feeding a 480 volt temporary power distribution center that we will place inside of the facility.
From the temp power distribution center, we are planning on supplying the building with several 480 volt power drops in various location to provide the workers with temp power in needed loactions...we can not possibly supply temp power through this building at one time......These temp power drops will be heavy duty 100 amp \ make n break \ plug and cord type...Each 480 volt drop will have a equipment grounding conductor in the temporary power cable.
We will have the workers roll a temp power cart up to these power drops and plug in their power carts...these power carts will have a 45 Kva transformer 480V \ 208-120 volt supplying a 24 cir panel....
Question - Does the code address the requirement for the secondary (X0) of the 45 Kva transformer (on a portable power cart) to be grounded to the closest building steel. Or, can the equipment grounding conductor in each cable run act as the ground system back to the original system established at the pad mounted transformer?
We will use a pad mounted 500 Kva transformer (13.8 Kva / 480 volt) that is located outside of the building feeding a 480 volt temporary power distribution center that we will place inside of the facility.
From the temp power distribution center, we are planning on supplying the building with several 480 volt power drops in various location to provide the workers with temp power in needed loactions...we can not possibly supply temp power through this building at one time......These temp power drops will be heavy duty 100 amp \ make n break \ plug and cord type...Each 480 volt drop will have a equipment grounding conductor in the temporary power cable.
We will have the workers roll a temp power cart up to these power drops and plug in their power carts...these power carts will have a 45 Kva transformer 480V \ 208-120 volt supplying a 24 cir panel....
Question - Does the code address the requirement for the secondary (X0) of the 45 Kva transformer (on a portable power cart) to be grounded to the closest building steel. Or, can the equipment grounding conductor in each cable run act as the ground system back to the original system established at the pad mounted transformer?
