Air Handler/Air Conditioning Unit installed over motor control center.

[rrc14]

Guys, is there anything in the NEC that prohibits the installation of an air handler/air conditioner directly over a motor control center? It seems like condensation from the air handler could overflow the drip pan with a drain, and leak into the motor control center? I think this is not permitted but can't find the code article in the NEC to reference:?. Anybody run across a similar situation?

Thanks,

 

[infinity]

You need 6':

110.26(E) Dedicated Equipment Space. All switchboards, pan-
elboards, and motor control centers shall be located in dedi-
cated spaces and protected from damage.
Exception:
Control equipment that by its very nature or
because of other rules of the Code must be adjacent to or
within sight of its operating machinery shall be permitted
in those locations.
(1) Indoor. Indoor installations shall comply with
110.26(E)(1)(a) through (E)(1)(d).
(a) Dedicated Electrical Space. The space equal to the
width and depth of the equipment and extending from the
floor to a height of 1.8 m (6 ft) above the equipment or to
the structural ceiling, whichever is lower, shall be dedicated
to the electrical installation. No piping, ducts, leak protec-
tion apparatus, or other equipment foreign to the electrical
installation shall be located in this zone.
Exception: Suspended ceilings with removable panels shall
be permitted within the 1.8-m (6-ft) zone.
(b)
Foreign Systems. The area above the dedicated
space required by 110.26(E)(1)(a) shall be permitted to
contain foreign systems, provided protection is installed to
avoid damage to the electrical equipment from condensa-
tion, leaks, or breaks in such foreign systems.
(c) Sprinkler Protection. Sprinkler protection shall be
permitted for the dedicated space where the piping com-
plies with this section.
(d)
Suspended Ceilings. A dropped, suspended, or
similar ceiling that does not add strength to the building
structure shall not be considered a structural ceiling.

 

[rrc14]

4160V Dedicated Electrical Space?

4160V Dedicated Electrical Space?

This issue is still lingering. Does the dedicated electrical space requirement for equipment rated for 600V also apply to equipment rated for 4160V? I am being told that it does not, however I'm thinking that the dedicated electrical space requirement for equipment rated for higher voltages still has to meet the 600V dedicated electrical space requirements as a minimum.

Does the NEC have any articles I can reference regarding the dedicated electrical space requirements for equipment rated at 4160V?

Thanks,

 

[david luchini]

This issue is still lingering. Does the dedicated electrical space requirement for equipment rated for 600V also apply to equipment rated for 4160V? I am being told that it does not, however I'm thinking that the dedicated electrical space requirement for equipment rated for higher voltages still has to meet the 600V dedicated electrical space requirements as a minimum.

Does the NEC have any articles I can reference regarding the dedicated electrical space requirements for equipment rated at 4160V?

Thanks,

The dedicated electrical space requirements for equipment rated 600V or below do NOT apply to equipment rate over 600V.

However, see 110.34(F). That is the closest section for over 600V.