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#1002932 - 12/30/17 04:22 PM Re: Air compressor question [Re: Bud]  
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ESokoloff Offline
MR. Sweet Pea
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Originally Posted by Bud
Easy Peasy! clap



Not really as the compressor is 2HP@120V
I doubt such a device (spring wound 2”x4” in the wall timer) exist that will handle the load.
Intermatic doesn't offer one.


Last edited by ESokoloff; 12/30/17 04:37 PM. Reason: Load rating update

Eric

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#1002942 - 12/30/17 05:35 PM Re: Air compressor question [Re: BeemerBerg]  
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Bud Offline
95% of an RT
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How many amps does it draw when starting?

Never mind, I looked on HF website, download the manual, 14 amps at start up.

HERE IS ONE THAT WILL HANDLE 20 AMPS, SPRING WOUND, WALL MOUNTED FOR $20

EASY PEASY grin

Last edited by Bud; 12/30/17 05:39 PM.

95% of an RT.

I haven't had too many Beemers, I just don't have enough time.
#1002944 - 12/30/17 07:12 PM Re: Air compressor question [Re: BeemerBerg]  
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TheOtherLee Offline
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Bud -
I see your switch is rated 1 HP while the compressor runs at 2. I’d be interested to know how significant is the difference.


Channeling farfegnugen since 2011.
#1002947 - 12/30/17 09:36 PM Re: Air compressor question [Re: BeemerBerg]  
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Bud Offline
95% of an RT
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Ya know Lee, since it can take 20 amps and it only takes 14, I'm not sure. But I wouldn't be afraid to try it. After all, what's the worst that can happen? Breaker trips??????


95% of an RT.

I haven't had too many Beemers, I just don't have enough time.
#1002960 - 12/31/17 06:41 AM Re: Air compressor question [Re: Bud]  
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ESokoloff Offline
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Originally Posted by Bud
Ya know Lee, since it can take 20 amps and it only takes 14, I'm not sure. But I wouldn't be afraid to try it. After all, what's the worst that can happen? Breaker trips??????


Sorry to single you out Bud but thought processing like this is why codes exist.

When a motor starts it draws LRA (Locked Rotor Amperage) until it gets up to speed.
LRA is approx 600% of FLA (Full Load Amperage).
14x6=84 amps.

That's why I seriously doubt a spring wound in the wall timer is made to handle the 2HP@120V load.

These devices are designed to handle three types of loads, Resistive, Tungsten, & Inductive.
Each of the three loads has different electrical characteristics that are factored into the maximum allowed rating of such a device.

Quote
Ratings

Resistive:
20 Amp, 125 VAC, 50/60 Hz
10 Amp, 250 VAC, 50/60 Hz
10 Amp, 277 VAC, 50/60 Hz

Tungsten:
7 Amp, 125 VAC

Motor:
1 HP, 120 VAC, 50/60 Hz
2 HP, 240 VAC, 50/60 Hz


As far as your question of "what's the worst that can happen?"
A lot more harm then tripping a cuircuit breaker.

Again, there's a good reason why we have codes.




Last edited by ESokoloff; 12/31/17 07:33 AM.

Eric

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#1002967 - 12/31/17 01:14 PM Re: Air compressor question [Re: BeemerBerg]  
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Bud Offline
95% of an RT
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No problem Eric. Obviously you know a lot more about this issue than I do. I just a country boy from Southern Illinois so you can't always depend on what I say to be accurate. wave

In the interest of continuing my electrical education, how can a wall outlet wired to a 20 amp circuit run with a switch handle the load and the timer can not? Inquiring minds want to know.


95% of an RT.

I haven't had too many Beemers, I just don't have enough time.
#1002968 - 12/31/17 02:01 PM Re: Air compressor question [Re: Bud]  
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Living the Dream Offline
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Originally Posted by Bud
No problem Eric. Obviously you know a lot more about this issue than I do. I just a country boy from Southern Illinois so you can't always depend on what I say to be accurate. wave

In the interest of continuing my electrical education, how can a wall outlet wired to a 20 amp circuit run with a switch handle the load and the timer can not? Inquiring minds want to know.



zactly,...as I said, I'm not a code follower and in this application, the rarity of use would allow, to me, for the mitigation of any risks involved. If the switch blew, I'd get a new one, if anything further happened, I'm well insured wink


Richard
Laborare pugnare paratus sum
2014 HP4
2010 Shadow RS
2006 R1200rt
PRC-E7
#1002989 - 12/31/17 05:38 PM Re: Air compressor question [Re: Living the Dream]  
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Bud Offline
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Originally Posted by Living the Dream
Originally Posted by Bud
No problem Eric. Obviously you know a lot more about this issue than I do. I just a country boy from Southern Illinois so you can't always depend on what I say to be accurate. wave

In the interest of continuing my electrical education, how can a wall outlet wired to a 20 amp circuit run with a switch handle the load and the timer can not? Inquiring minds want to know.



zactly,...as I said, I'm not a code follower and in this application, the rarity of use would allow, to me, for the mitigation of any risks involved. If the switch blew, I'd get a new one, if anything further happened, I'm well insured wink


Ignorance is bliss, but, once informed, it is just ignorance.

A friend of mine in the insurance business says that insurance companies are using social media to gather information in some cases where there is a question of policy holders culpability in a loss.


95% of an RT.

I haven't had too many Beemers, I just don't have enough time.
#1003003 - 12/31/17 11:04 PM Re: Air compressor question [Re: Bud]  
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ESokoloff Offline
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Originally Posted by Bud
No problem Eric. Obviously you know a lot more about this issue than I do. I just a country boy from Southern Illinois so you can't always depend on what I say to be accurate. wave

Bud, I’m sure you’ve forgotten hundreds of times more of your profession then I’ll ever know.

I’m not an electriction by trade but being in the HVAC trade I’ve become a Jack of all trades out of nessesity.


Originally Posted by Bud
In the interest of continuing my electrical education, how can a wall outlet wired to a 20 amp circuit run with a switch handle the load and the timer can not? Inquiring minds want to know.

Apples vs Oranges.

If a switch is rated for 1hp@120v then it will be rated for 20a resistive load.
If a switch is rated for 2hp@120v then it will be rated for 30amp resistive load.

Resistive loads (incandescent lights, strip heaters) do not have rotors & thus no LRA when the switch contacts close.

As to why there are no in the wall spring wound timers with a 2hp@120v load rating I would have to guess that there is not enough demand but again, that’s just a guess.


To the OP, how about a 2hp/30a@120v rated switch that has a pilot indicator light the eliminates when the contacts are closed (switched on)?
see page 12 of 36
Also consider plugging in to the switched socket, a radio or perhaps a device that will make noise after a pre determined time to remind you to turn off the switch?


Last edited by ESokoloff; 12/31/17 11:34 PM. Reason: Speelen correzun

Eric

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#1003004 - 12/31/17 11:11 PM Re: Air compressor question [Re: Bud]  
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Living the Dream Offline
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Originally Posted by Bud
Originally Posted by Living the Dream
Originally Posted by Bud
No problem Eric. Obviously you know a lot more about this issue than I do. I just a country boy from Southern Illinois so you can't always depend on what I say to be accurate. wave

In the interest of continuing my electrical education, how can a wall outlet wired to a 20 amp circuit run with a switch handle the load and the timer can not? Inquiring minds want to know.



zactly,...as I said, I'm not a code follower and in this application, the rarity of use would allow, to me, for the mitigation of any risks involved. If the switch blew, I'd get a new one, if anything further happened, I'm well insured wink


Ignorance is bliss, but, once informed, it is just ignorance.

A friend of mine in the insurance business says that insurance companies are using social media to gather information in some cases where there is a question of policy holders culpability in a loss.


Again, I'll mitigate the risks compared to the requirements. No addition to my house has ever been inspected nor permitted. I just completed a bathroom remodel (complete gut job) and a basement bathroom addition (from scratch). My previous house was completely remodeled in every room, no inspections, no permits and sold just fine with no issues. We even threw in a wood stove from scratch, not inspected/permitted.

Ignorance by definition is simply lacking of information/knowledge. I'm not ignorant of the requirements/information/knowledge, I just choose to ignore them at times.


Richard
Laborare pugnare paratus sum
2014 HP4
2010 Shadow RS
2006 R1200rt
PRC-E7
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