Switchgear - Switch House

[pnstu36]

I have an application involving 480/277V, 3 phase switchgear. The switchgear is different since it houses constant current regulators in the same fashion as drawout circuit breakers. The regulators drawout similar to circuit breakers and the regulators maintain constant current (i.e. 6.6A or 20A) therefore the output voltage of the regultor can change somewhere from 0 to 5000V depending on current. The input to each regulator is 480V as it is connected to the 480V bus of the switchgear. My questions are: (1) Is this gear considered 600V or less or over 600V? I believe it is still considered 600V or less even though the output voltage of the regulators in the switchgear is over 600V. (2) Is there a maximum height requirement for the switchgear? If it falls under 600V or less then it would follow NEC Art. 110.26. If it is over 600V, I haven't seen an article to cover maximum height. Please Respond.

 

[flightline]

Re: Switchgear - Switch House

It would appear that you have airport lighting circuit regulators. Are these installed at an airport governed by FAA advisory circulars? I have come across installations such as you describe here. Just curious.

 

[pnstu36]

Re: Switchgear - Switch House

You are correct in your observation, however, I am in the design stages and the switchgear has not been installed. FAA Circulars do not cover switchgear constant current regulator lineups voltage (i.e.600V or less) and maximum height requirements. The switchgear is in a switch house.

[ December 30, 2003, 05:05 PM: Message edited by: pnstu36 ]