Double pole switch in lieu of disco

Status
Not open for further replies.
F

follybeacher

Member
Location
USA
Occupation
Estimator
I often see discos diagrammatically shown on plan but the intent may be simply means of disconnect... any issues with using a double pole switch (lets say either a 240V/20A or 30A for sake of discussion) with a flex whip and term to the equipment? This assembly would be applied to exhaust fans, VAVs, etc in accessible ceilings typically.

As shown in the pic EEs typically show a switch for 120V/20A means of disconnect so I figured I'd ask the hive. Thanks!


Capture.jpg
 
Nothing wrong with using Dp switches (208/240) v or sp switches (120/ 277) for controlling fans, etc. As long as a fuse is not mentioned on the nameplate the switches will work.
 
Great! Just trying to save cost while maintaining intent of design and code compliance. These little things help.
 
Some of those pull out AC disconnects cost less than a 2 pole toggle switch, box and cover. Sometimes the switch, box and cover might be more practical though.
 
I agree a pullout resi disconnect cost half what a 30A DP switch in 4" square does.

Sent from my SM-G930V using Tapatalk
 
Cool. I totally agree I prefer a DP toggle.. one on my WH in basement. I was replying to OP.

Sent from my SM-G930V using Tapatalk
 
Be sure to check all mechanical specs and schedules. A lot of those units are specified to have factory disconnects included
 
cdslotz said:
Be sure to check all mechanical specs and schedules. A lot of those units are specified to have factory disconnects included
Click to expand...

this is good advice and I do check and qualify as such

I often forget about those resi pull out discos. I imagine they can't be installed in anything other than multifamily or resi... for example commercial applications where specs call out general duty safety switches or such?
 
follybeacher said:
this is good advice and I do check and qualify as such

I often forget about those resi pull out discos. I imagine they can't be installed in anything other than multifamily or resi... for example commercial applications where specs call out general duty safety switches or such?
Click to expand...

If specs called for such-yes but those pull out discos are certainly used in commercial a lot.

They are not limited to resi applications.
 
jumper said:
If specs called for such-yes but those pull out discos are certainly used in commercial a lot.

They are not limited to resi applications.
Click to expand...

Most commercial specs require heavy duty safety switches, so resi pull-outs would not be accepted
 
Status
Not open for further replies.
Top