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A volt free contact is a set of contacts that uses a voltage source from another location. The contacts are used to tie two individual pieces of electrical equipment together so the action on one will cause the other piece of equipment to operate. It is just a new way of using the older terminology "dry contacts". An example of use is the diesel start contacts on an automatic transfer switch. When the transfer switch is in the utility (hydro) position the diesel start "dry contacts" located in the transfer switch are open. On a power failure the transfer switch disconnects from the utility and connects to the generator position. When the transfer switch moves to the generator connect side the "dry contacts" , or volt free contacts, in the transfer switch close. This allows a voltage from the generator control panel (usually 24 volts DC) to return to the start relay located in the generator control panel. This relay engages the starter and starts the diesel generator. On return of utility power the reverse action takes place and the volt free contacts return to their normal state of normally open.
Wiki User
∙ 14y ago
Wiki User
∙ 11y agoKelvin connection
uses 2 contacts on a connection for measurement
this will mean no loading for the device under measurement
volt free or current free depending on which you wish to see
the standards lab at a mythical company i worked for (GE) has a bunch of very nice 7 digit 4 terminal voltmeters the department head is very proud of himself
he went to the machine shop and had them make some nice shorting bars that he installed on the meters
he must have read somewhere that the 4 terminal test is more accurate... That why a Phd gets the big bucks i guess
and why i get in trouble when i remove the shorts and scare up 4 wires to find out what the resistance of a shunt is in a motor drive is when it looks a little blacker than i remember a new one
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on a standard 110-120 volt recptical the larger contact is the neutrial (white)side the smaller contact is the "hot" side
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Check the manufacturer website. If there is no diagram on line you can contact their customer service.
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You will need an interpose relay. This relay will have a 24 volt coil. The circuit power for the relay will come from a 120VAC to 24VAC volt transformer. The 24 VAC circuit will have the thermostat in series with the coil of the relay. Thermostat calls for heat, the coil energizes and the relay's contacts close. Your circulator pump is controlled by the relay. On selecting the relay make sure that the contact ratings can handle the full load amps of the circulator. A contact rating of 120 volts at 15 amps will do very nicely.
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If you want your bulbs to last longer then use 130 volt bulb on a 120 volt system. The light emitted by a 130 volt bulb, when comparing it to a 120 volt bulb, will be a bit dimmer.
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Volt free contact
Which contact is bigger on a 110 volt plug?
on a standard 110-120 volt recptical the larger contact is the neutrial (white)side the smaller contact is the "hot" side
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The 2014 Chevrolet Volt has free maintenance for 2 yr./ 24000 mi..
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If you mean to contact the actual company operating the toll-free number - simply call it, and ask for the company's contact details !
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Check the manufacturer website. If there is no diagram on line you can contact their customer service.
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Where can I get a free acting lesson ?
Contact your local community theater to see if they have free acting lessons. You might also contact a local university to see if their students can offer free mentoring.
