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Old 10th October 2012, 11:57 PM   #1
rize is offline rize  United States
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Default Isolation Transformer - AC Plug question

For DIY projects, I bought a medical grade isolation transformer from eBay. The traf is made by Toroid. Not sure if Toroid is in business. They don't answer phones and don't reply to e-mails. Some of their pages on their web-site are not working.

Can anyone tell me what type of AC plug is required for the 4 AC receptacles fitted in the front panel?

Standard AC power cord with circular ground pin obviously doesn't fit. I assume the hospital equipment has different plugs than equipment designed for home use. The neutral and the hot conductor pins (unlike the std AC cord) has sockets of different shape and size. The front label states neutral conductor is not grounded hence the isolation from the Ground at the utility pane which is great but why disallow the use of standard AC power cord? I can use this traf with an improvised cord but not being able to use standard AC power cord is inconvenient. I'm thinking of changing the receptacles or find a place which sells suitable power cord. Thank you for your comments in advance.
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Old 11th October 2012, 01:56 AM   #2
sreten is offline sreten  United Kingdom
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Hi,

They are unusual, being female and you wont find any mains leads with male
connectors. Change them to the usual male sockets for the usual female plugs.

rgds, sreten.

Typical mains lead :
Click the image to open in full size.

Typical mains socket :
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Old 11th October 2012, 02:10 AM   #3
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They are unusual for a reason, they are power output. Having live exposed terminals is a bad idea.

The OP wants a IEC female - IEC male lead, they are commonly used for power distribution from UPS (uninterrupted power supply). An alternative is something like this http://www.ebay.com.au/itm/15cm-UPS-...#ht_1254wt_954
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Old 11th October 2012, 02:21 AM   #4
sreten is offline sreten  United Kingdom
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Quote:
Originally Posted by hochopeper View Post
They are unusual for a reason, they are power output.
Having live exposed terminals is a bad idea.
Hi,

You are quite right, and that makes perfect sense.

The lead and input socket I showed are exactly that,
mains input, whilst here its mains output, so your
going to need a unusual mains lead, male to female.

rgds, sreten.

My advice to change them is dreadful .... muppet ....
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Old 11th October 2012, 05:23 AM   #5
rize is offline rize  United States
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Did a little more research to find out the receptacles are IEC 60320-2-2 Class I Power Components - plug connector Sheet E to be exact.
Click the image to open in full size.
Just one Sheet E connector is $13 plus S&H for one plug at Amazon !
http://www.amazon.com/Conntek-60905-Bare-Connector-Sheet/dp/B001H4J3M4/ref=pd_bxgy_lg_img_y
I'm definitely inclined to change the Sheet F outlets to standard female outlets since they are power output. A cheaper alternative is AC Female Outlet~PC Male Power Adapter Cable/Cord/Wire IEC320 C13/C14.

No wonder the transformer was priced rather low on eBay. I overlooked the fact that outlets will not work with standard AC connector plugs. Fortunately it came with it's own power chord, standard 3-prong plug. Aside from the receptacle issue, it's appears to be well-made, included documentation showing the circuit.
Thank you for your comments.

Last edited by rize; 11th October 2012 at 05:33 AM.
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Old 11th October 2012, 05:57 AM   #6
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DO NOT change the outlet connectors on the device. This will have exposed live parts and be a SERIOUS health hazard.

DO purchase the correct leads - IEC 320 Sheet E to IEC C13 Power Cord or the IEC -> 3 pin plug adapter for your country (Aus equivalent linked in my previous post).
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Old 11th October 2012, 06:08 AM   #7
kevinkr is offline kevinkr  United States
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I use a couple of these transformers in my system, the proper plugs are readily available on eBay for short money as are short pigtails with standard NEMA 15A sockets on one end and IEC with male pins on the other.

No need to modify the transformer, and in fact since all of the components in my system use IEC connectors I am contemplating changing the plugs on the power cables to use the IEC with male pins.

I've got a 600VA and a 1kVA made by Toroid Corp of Maryland, the maker of your unit. The company is very much still in business, in fact we have a bunch of these at work. (I work in medical electronics.)

Note that the output is floating and interestingly I found that the overall hum level in my system decreased very slightly.
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Old 11th October 2012, 06:27 PM   #8
DF96 is offline DF96  England
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Those IEC power input/output sockets are perfectly normal and standard in Europe. The cables are widely available over here.
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Old 11th October 2012, 07:20 PM   #9
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Sourcing that cable connector should be pretty easy at a computer recycler. It used to be common for the computer CRT monitor to be plugged into the back of the computer PS. I had at least 1 old PC monitor and 1 old Mac monitor that that had the male IEC connector for power.
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Old 11th October 2012, 07:37 PM   #10
Davey is offline Davey  United States
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Plenty of suitable cords available at Digikey, Mouser, etc. A typical example:

AK500-OE-11-1-R Assmann WSW Components | AE9911-ND | DigiKey

Dave.
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