Buck and boost transformer

[five.five-six]

I have a customer is having a piece of equipment installed that calls for a dedicated 220 volt 30 amp NEMA 14-30 receptacle. The cut sheet specifies if this ility has to avoid service appropriate techniques should be used to step up the line voltage. Is the buck boost transformer considered a separately derived power source and do I need a ground rod for it?

 

[don_resqcapt19]

I have a customer is having a piece of equipment installed that calls for a dedicated 220 volt 30 amp NEMA 14-30 receptacle. The cut sheet specifies if this ility has to avoid service appropriate techniques should be used to step up the line voltage. Is the buck boost transformer considered a separately derived power source and do I need a ground rod for it?

A buck boost set up is an auto transformer and is not a separately derived system.

 

[kwired]

More details of your equipment needs as well as what premises voltage is will help us help you here.

As Don said, a buck boost is an autotransformer and is not a separately derived system.

A 14-30 receptacle is intended to supply 120/240 multiwire circuits - so if that is the receptacle specified we can sort of assume you have something that needs 120/240 multiwire circuit run to it. If you have 120/208 available and do need to convert to 120/240 you about need to go with a isolation transformer and the output of it will be a separately derived system. If the load can handle 120/208 for supply voltage you can connect directly to such a system, but like I said more details would help us help you.

 

[five.five-six]

You are right, I don't have the nameplate and through some internal stuff that's way too complicated to explain I don't get anything more than they are asking for 30 amps and that it needs 220 and won't work on 208. I explained to the customer that without info like starting amps and locked rotor current and starting current, I can't guarantee that it will work and that they will have bought this transformer and will be buying the correct transformer and paying me to install it as well. They are fine with that.


This is the transformer I am planning on using, I oversized it by about 30% just to be on the safe side.

http://www.acmetransformer.com/en/t2535163s

 

[ActionDave]

You are right, I don't have the nameplate and through some internal stuff that's way too complicated to explain I don't get anything more than they are asking for 30 amps and that it needs 220 and won't work on 208. I explained to the customer that without info like starting amps and locked rotor current and starting current, I can't guarantee that it will work and that they will have bought this transformer and will be buying the correct transformer and paying me to install it as well. They are fine with that.


This is the transformer I am planning on using, I oversized it by about 30% just to be on the safe side.

http://www.acmetransformer.com/en/t2535163s

We did a job about ten years ago where the owner paid for a new service on his building because he was making one section of it a tanning salon. He said the tanning booth people insisted he must have a 240V service, 208v was unacceptable........ new service goes in, equipment arrives, nameplate says 208V/240. At that point the owner had no choice but to be fine with the money he had spent. I made some overtime on the job so my feelings weren't hurt.

 

[Ponchik]

For some reason some owners/clients will not give you important information for you to design and install the job correctly. :happysad:

They think more information they give out it will cost more to install.

 

[kwired]

For some reason some owners/clients will not give you important information for you to design and install the job correctly. :happysad:

They think more information they give out it will cost more to install.

I guess you could write a figure on each card of a standard deck of cards and show them the ranges of numbers - then shuffle the deck and have them draw a random estimate and see what they think of your estimating process

 

[five.five-six]

For some reason some owners/clients will not give you important information for you to design and install the job correctly. :happysad:

They think more information they give out it will cost more to install.

That's not it in this case. I know why they won't reach out to the vendor but I am not at liberty to say. The equipment provider is under the impression that my customer already has the recep installed... Next question, can I eve get a hospital grade 14-30?