I am having a 36,000 BTU split system installed. This unit is 230/208v with 30 amp breaker. Instead of using the pull out style or lever style disconnects, would it be safe to use a 30 amp 120/277v a/c double pole toggle switch mounted in a appropriate weather proof box as my disconnect?

I will say no, better to use the pull out style. The switch you are proposing must be listed as a motor-circuit switch, rated in horsepower, and several other qualifying criteria that mostly it is not, as per NEC Section 440.109 (A) (1).

See the sticky, Read this First for a link to the NEC.

Thank you very much for responding. Yes, it is a motor-circuit switch. It is a industrial grade double pole grounding switch useed for motor operated equipment,water heaters, pumps etc. Here is a link to this switch. Please tell me what you think.

Lowe's Home (http://www.lowes.com/lowes/lkn?action=productDetail&productId=73267-334-3032V-SP-L&lpage=none)

Looks like your all set, I checked the Cooper site, and found this switch is rated for 2 HP or 24 amps, so your good to go.

Thank you!

No

That switch is probably around $20, plus a box to put it in, plus a cover.
A pull-out is around $10 complete, plus less labor to install.

What could your motive possibly be to use the switch??

no
No what?? :confused: