High Voltage Room Airconditioning

[Kalikot]

Is there any rules and regulation regarding the installation of air conditioning unit which feed by chilled water system? I am aware for possible water drip off and water leakage on the piping. If so is it applied also to tranformer room and low voltage room?

 

[DRWeig]

Hi Kalikot,

Not allowed. Keep the water (and possible condensation that goes along with it) out of the electrical rooms. If the room needs cooling, set your fan-coil unit outside the room and duct some cold air in.

NEC 110.26(F)(1) gives specifics.

Good on ya,

Goober Dave

 

[KiwiMace]

You also cannot generally duct over switchgear. There is a work around with drip pans though.

 

[Kalikot]

As what I understand on the NEC 110.26(F)(1), the acu unit is prohibited to be installed above any electrical equiptment but does not prohibited to be installed within the room. Please clarify?

 

[cry22]

You can have the piping inside electrical room per NEC if they serve ONLY that room.
IMC requires emergency drain pan under unit with drain pan overflow alarm.
We typically use a double containment pipe for the condensate piping, and a drain pan under the CHW piping, piped to the condensate drain.

 

[DRWeig]

Good input from all posters ---

One more point: Check with AHJ. In one locale, I was forced to take all piping and cooling from the room, the only thing he would accept was a sidewall diffuser across from the electrical gear.

Good on y'all,

Goober Dave