Unexpected high current on 3 ph induction hob.

I may have found the answer.The hob I looked up is American so their 3 ph voltage appears to be 240,so this would explain

the higher current.

                          Regards,Hz

Be careful with american mains supplies. you might have 240v delta (with a centre tap on one winding earthed) giving you 120,120 and 208 to earth, and 240 between any two phases, or a corner grounded delta with 240 to earth on each of the two 'lives' but 240 also between the lives.... or a split single phase 120/240v appliance that happens to have 3 wires...it's a bl**dy minefield. (but I did learn to check a few assumptions at the desk, when I worked over there.


Finding 277/480v 3 phase Y service** to a building, with single phase ( but connected phase to phase)  transformers providing a 'normal for the US' 240 v  split phase (120-0-120) for normal outlets, isn't at all uncommon.


Their system taught me a lot, and despite the complexity (probably why they require electricians to be licensed journeymen)... has some advantages. But.. in your case, email the manufacturer to triple check. Also check that the Induction hob will handle 50Hz ok (if that's your intended application)


Up North in Canada, apparently it's 347/600 volts, which would be even more hair raising!

Many thanks for the advice,MH.

                                             Regards,Hz

I was also going to mention the frequency issue especially if it has a motors in it they MITE not be too happy on our 50 cycle supply.US mains supply's are a nitemare how can one country have so many voltages? It's a bit like hear years ago when mains was anywhere between 190 and 250 and between 25 and 100 cycles or even DC LOL

There are indeed many voltages in the USA, the most common systems are,


3 phase, 4 wire, at 120/208 volts. The norm for smaller business premises and for blocks of apartments.

Single phase, 3 wire, at 120/240 volts. The norm for single family homes.

3 phase, 4 wire at 277/480 volts. Prohibited domestically but popular for industry and larger offices and supermarkets.

3 phase, 4 wire delta, at 120/240 volts with 208 volts between the "high phase" and the neutral. Used to be popular for farms and homes with a largely single phase 120/240 volt demand, but that also need 240 volts three phase for central air conditioning or farm machinery.


The drawback of these systems is the availability of three voltages that are "in the same ball park" but not close enough to be easily interchangeable. 208 volts, 240 volts and 277 volts are all popular.

Small appliances and domestic lighting are virtually always 120 volts. Large domestic appliances such as cookers, water heaters, clothes dryers and the like might be connected to either 120/208 or to 120/240 volt systems. Very few such appliances are made specifically for 208 volts, they are usually listed for operation on either voltage but with reduced performance on 208 volts, and worse still if the nominal 208 volts is actually under 200 volts.

You'll sometimes find a switch or jumper inside things with compressors such as window a/c units to switch between 208 and 240.  277 single phase is almost never used for loads on its own with the exception of lights. (many light fixtures such as emergency lights come with a multitapped transformer). When run off 120v, the 277v tail is capable of giving you a fairly nasty whack if you don't have it capped off!