mini split disconnect

Status
Not open for further replies.
W

wireday

Senior Member
Location
New England
Occupation
Master electrician
If I use the arrow hart AH7810GD 3 pole disconnect, is there a place to ground the metal box? so that the switch will be grounded. Also If I run LTFC from a 4 square over the dropped ceiling down to this disconnect beside the inside air handler,can I run down and back up the same LTFC. with all 6 conductors plus ground?
 
Last edited:
Sure you can have the 6 conductors in the flex as long as you derate and they can fit. In NC it has been determined that an inside switch is not necessary as long as you bring the power to the outside unit thru a disconnect. They say the units are listed together as one unit so only the one disconnect is needed.
 
Here is their argument

Question does a mini split system require disconnects at both the exterior condenser unit and the interior blower unit?

Answer:No, unless required by the manufacturer or listing instructions.

Mini splits systems as defined above are connected to the structure’s electrical system by one individual branch circuit. Because a mini split system is supplied with electrical power at only one point from the structure’s electrical system, the mini split system is one single machine as defined by section 440.8 of the State Electrical Code.

A single machine defined by section 440.8 shall be permitted to have a single disconnecting means to serve all the motors of a mini split system as provided in section 430.122 Exception (a).Section 440.14 requires a disconnecting means to be located within sight and readily accessible from the air-conditioning or refrigeration equipment.

Therefore, the single disconnecting means shall disconnect the structure’s electrical system from the mini split system at only one point and shall be located within sight and readily accessible from that point of connection.

For clarity, section 440.8 does not apply to a typical HVAC split system with air ducts because the air-handler and heat pump are separate pieces of equipment that are supplied by a minimum of two branch circuits from the structure’s electrical system.
Click to expand...
 
Last edited:
Helps to have your location listed. Many (most?) of us don't have to do this stupid indoor disco at the evaporator. I install these on a regular basis without one.
 
Status
Not open for further replies.
Top