Panel

[codequestion]

I have 120/240v single phase panel with 120/208v single phase service feeding the panel. Can I feed 240V single phase loads from the panel or I need 120/240V service?

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[Dennis Alwon]

What are the loads?>

 

[codequestion]

What are the loads?>

Hvac, heater, mainly.

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[Dennis Alwon]

The hvac guys need to install a system that matches the voltage that is there. I would not wire 208 to a 240 volt a/c.... unless the unit says 208/240

 

[charlie b]

The heater will run at about 75% of its heating capacity with the lower voltage.

 

[codequestion]

The hvac guys need to install a system that matches the voltage that is there. I would not wire 208 to a 240 volt a/c.... unless the unit says 208/240

I thought so. I have very arrogant engineer who claims she does not have to do anything and provide 208V load single phase with hvac rated single phase 240V. I recommended at least provide note no single phase 240v loads fed from the panel unless 208v/240v rated. I got complained and hot water for that.

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[ActionDave]

I don't know of any HVAC units that are straight 240V anymore. They all are 208/240V.

 

[kwired]

I don't know of any HVAC units that are straight 240V anymore. They all are 208/240V.

I agree. If resistance heat they typically have both 208 and 240 volt kw rating marked right on the unit. Compressors and blower motors are also rated 208-240 volts.

Some specific heating units may sometimes be 208 only - one I do run into on regular basis is cove heaters - manufacturer I buy has 208 and 240 volt units - both same watts for same length of unit - 208 units will not be warrantied if they are connected to 240, though you could connect a 240 volt unit to 208 - they technically may not warranty it, but it isn't all that likely to fail either since it will only run at 75% of rated wattage.

Water heaters almost always have both 208 and 240 volt rating marked on them.

Ranges and dryers often do as well.

 

[codequestion]

Its existing panel. 240V hvac. 120/208v service is new. Why? I dont know. For safety sake would it be too much to provide note no 240V loads allowed?.

I agree. If resistance heat they typically have both 208 and 240 volt kw rating marked right on the unit. Compressors and blower motors are also rated 208-240 volts.

Some specific heating units may sometimes be 208 only - one I do run into on regular basis is cove heaters - manufacturer I buy has 208 and 240 volt units - both same watts for same length of unit - 208 units will not be warrantied if they are connected to 240, though you could connect a 240 volt unit to 208 - they technically may not warranty it, but it isn't all that likely to fail either since it will only run at 75% of rated wattage.

Water heaters almost always have both 208 and 240 volt rating marked on them.

Ranges and dryers often do as well.

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[kwired]

Its existing panel. 240V hvac. 120/208v service is new. Why? I dont know. For safety sake would it be too much to provide note no 240V loads allowed?.

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Nobody hardly ever marks panels in that manner. Might not hurt to place a 120/208 volt label on the panel though. If whoever in the future may add such a load doesn't understand what that means - they likely are going to install whatever it is they are there to install anyway and it gets 208 instead of 240. One that is well trained will figure it out whether you mark it or not.

 

[ActionDave]

Its existing panel. 240V hvac. 120/208v service is new. Why? I dont know. For safety sake would it be too much to provide note no 240V loads allowed?.

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I don't see any reason to.

It's not really a safety issue.

We live in a 208/240V world now.

If somebody is hooking up a 240V ONLY piece of equipment the burden is on them to make sure the voltage is correct.

As a matter of fact, when it comes to hooking up any piece of equipment the burden is on the installer to make sure of the voltage rating of the equipment and the voltage system present.

 

[kwired]

I don't see any reason to.

It's not really a safety issue.

We live in a 208/240V world now.

If somebody is hooking up a 240V ONLY piece of equipment the burden is on them to make sure the voltage is correct.

As a matter of fact, when it comes to hooking up any piece of equipment the burden is on the installer to make sure of the voltage rating of the equipment and the voltage system present.

I agree.