7500w 240v heater install not working

[Hotsauce]

Installed the stablok breaker a 2 pole 40a and I have power at the breaker and 120 at each end of the wires. Wired in per the pic below but heater won’t turn on. Need some help please

 

[Hotsauce]

Not sure if I should be getting voltage across this part?

 

[sberry]

You got the breaker installed wrong. Each line is 120 to the ground wire but not 240 between them? You need to look closely at the buss and straddle a plastic I think. Both poles are now on one leg of the service, they are live, but no potential difference between them.

 

[Hotsauce]

Picture of the breaker

 

[Hotsauce]

You got the breaker installed wrong.

Maybe I didn’t do enough research? Fits perfect and it’s a stab-lok
What did I miss?

 

[sberry]

Ok, the gray one? Pull the one out below it, move it down a space and plug the one you remove in above it.

 

[Hotsauce]

I can do that first thing tomorrow morning. If I am getting 120v at the end of each hot wire going into the heater, doesn’t that suggest the breaker is ok?

 

[Bert_]

Why are you checking for 120v? The heater does not use 120v...

The heater only cares if you have 240v line to line. That is what you need to check for, 240v line to line. Any other test is meaningless.

I don't know Canadian code but in the states 10/2 is not big enough to run a 7500w heater.

 

[alfredeneuman]

I can do that first thing tomorrow morning. If I am getting 120v at the end of each hot wire going into the heater, doesn’t that suggest the breaker is ok?

The breaker itself is OK, but in the wrong place. It's on the same leg, and there is 0 volts between them.
Do as sberry says, and you should be OK

 

[wyliesdiesels]

I can do that first thing tomorrow morning. If I am getting 120v at the end of each hot wire going into the heater, doesn’t that suggest the breaker is ok?

The heater runs on 240v not 120v so youre testing the voltage incorrectly. you need to measure lug to lug not lug to ground or neutral. Lug to lug you should get 240v.

Does the heater breaker connect to both busses? If not, then you wont get 240v, lug to lug. but you WILL get 120v, lug to ground or neutral.

Also, those FPE breakers and panels are nasty. may want to inspect it to make sure its in good shape.

Also, if CEC requires 125% factor on continuous loads, then the 10/2 is too small, which is limited to 30a. you need 8/2 which is rated for 40a. 7500/240 = 31.25 x 125% = ~39a.

 

[sberry]

I can do that first thing tomorrow morning. If I am getting 120v at the end of each hot wire going into the heater, doesn’t that suggest the breaker is ok?

Imagine you put both wires on the same 120v breaker, no difference between them.

 

[Hotsauce]

Thanks guys I didn’t have it bridging both legs. I was expecting 120v x 2 wires converts but it must want 240v in each. The instructions did mention 10ga, I guess that was a waste of $$?

 

[wyliesdiesels]

Thanks guys I didn’t have it bridging both legs. I was expecting 120v x 2 wires converts but it must want 240v in each. The instructions did mention 10ga, I guess that was a waste of $$?

no its not converting anything and you dont get "240v in each".

the 2 phase legs are each 120v still, but they are 180° out of phase of each other, so the potential between the 2 legs is 240v.

If the breaker only stabs one bus in the panel, you will only get 120v potential.

you may want to do some more reading before you proceed as you seem to be a bit unknowledgeable on the basics here.

as to the wire gauge, you need to check canadian code.

 

[Hotsauce]

More reading for sure, I spent 10 mins lol - I’m an Accountant but this will be sorted tomorrow morning. Thanks to all for the advice. Oh I did wire my basement and panel from scratch but didn’t have to deal with 240 ��

 

[like2wheel]

Pretty sure it's cuz you didn't sharpie the white wire black.

 

[nadogail]

Pretty sure it's cuz you didn't sharpie the white wire black.

I have used liquid paper to identify a black wire as a white when building a control box for a hydraulic press.