AC disconnect

[mannyb]

If the RTUs already have a breaker disconnect mounted on unit. Would there be a need to provide another disconnect if the unit already has one? Its a trane unit and the breaker is accessible without opening door to turn on or off.

 

[Dennis Alwon]

No, the disconnect on the unit should suffice as long as it disconnects all power to the unit.

 

[Jraef]

Provided it can be locked off / open.

 

[Dennis Alwon]

Provided it can be locked off / open.

Why would the breaker need to be lockable. The lockable is for when the disconnect is not within sight, IMO

440.14 Location. Disconnecting means shall be located within
sight from, and readily accessible from the air-conditioning or
refrigerating equipment. The disconnecting means shall be
permitted to be installed on or within the air-conditioning or
refrigerating equipment.
The disconnecting means shall not be located on panels that
are designed to allow access to the air-conditioning or refrigeration
equipment or to obscure the equipment nameplate(s).

Exception No. 1: Where the disconnecting means provided in accordance
with 430.102(A) is lockable in accordance with 110.25 and the
refrigerating or air-conditioning equipment is essential to an industrial
process in a facility with written safety procedures, and where the conditions
of maintenance and supervision ensure that only qualified
persons service the equipment, a disconnecting means within sight from
the equipment shall not be required.

Exception No. 2: Where an attachment plug and receptacle serve as the
disconnecting means in accordance with 440.13, their location shall be
accessible but shall not be required to be readily accessible.

 

[infinity]

I see no reason for a locking mechanism in the NEC if it's within sight.