240v Power to 2 Thermostats

Ask your electrical related questions here
Post Reply
Fugative
Posts: 6
Joined: Fri Oct 25, 2019 4:11 pm

240v Power to 2 Thermostats

Post by Fugative » Fri Oct 25, 2019 4:32 pm

Hi All,

My first post and for good reason...I am totally stumped. I am running a dedicated 240v 20amp line to Box 1 (contains tstat 1). Tstat 1 then runs to baseboard 1. The line then runs to box 2 which has tstat 2 and runs a 2nd baseboard. I just need to know if I wired it correctly. I am getting some wired voltage at baseboard 1 when breaker is on but tstat is off. I attached a diagram as well (sorry if it’s messy). Any help is greatly appreciated.
Attachments
2F63C5FB-2442-47E7-9B18-D9091079FFF9.jpeg
2F63C5FB-2442-47E7-9B18-D9091079FFF9.jpeg (154.4 KiB) Viewed 80 times

User avatar
Aaron
Posts: 3575
Joined: Sat Jan 03, 2015 4:03 pm
Location: St. Paul, MN

Re: 240v Power to 2 Thermostats

Post by Aaron » Fri Oct 25, 2019 5:05 pm

Doesn't the thermostats have incoming and outgoing power terminations? The 240V ones often do.

Fugative
Posts: 6
Joined: Fri Oct 25, 2019 4:11 pm

Re: 240v Power to 2 Thermostats

Post by Fugative » Fri Oct 25, 2019 5:06 pm

Each thermostat has a black and red wire if that’s what you’re asking.

Fugative
Posts: 6
Joined: Fri Oct 25, 2019 4:11 pm

Re: 240v Power to 2 Thermostats

Post by Fugative » Fri Oct 25, 2019 5:24 pm

A couple more pics of box 1
Attachments
EF5150B4-12C1-4C26-80FD-11C382AEFBE7.jpeg
EF5150B4-12C1-4C26-80FD-11C382AEFBE7.jpeg (141.37 KiB) Viewed 71 times
A8738DDD-8FE3-4FDB-ACCE-163CB9507A5A.jpeg
A8738DDD-8FE3-4FDB-ACCE-163CB9507A5A.jpeg (156.33 KiB) Viewed 71 times

Fugative
Posts: 6
Joined: Fri Oct 25, 2019 4:11 pm

Re: 240v Power to 2 Thermostats

Post by Fugative » Fri Oct 25, 2019 5:26 pm

Do I even need the jumper or can I bundle it with the other black wires?

User avatar
Aaron
Posts: 3575
Joined: Sat Jan 03, 2015 4:03 pm
Location: St. Paul, MN

Re: 240v Power to 2 Thermostats

Post by Aaron » Fri Oct 25, 2019 8:06 pm

Hmmmm, are you sure those stats are for 240V heaters then? Because it needs to switch two poles, not just one.

Fugative
Posts: 6
Joined: Fri Oct 25, 2019 4:11 pm

Re: 240v Power to 2 Thermostats

Post by Fugative » Fri Oct 25, 2019 10:22 pm

Yep, they work on 240v
Attachments
image.jpg
image.jpg (193.38 KiB) Viewed 64 times

User avatar
emtnut
Posts: 1960
Joined: Mon Mar 02, 2015 7:21 am
Location: Canada
Contact:

Re: 240v Power to 2 Thermostats

Post by emtnut » Sat Oct 26, 2019 8:03 am

Fugative wrote:
Fri Oct 25, 2019 4:32 pm
Hi All,
My first post and for good reason...I am totally stumped. I am running a dedicated 240v 20amp line to Box 1 (contains tstat 1). Tstat 1 then runs to baseboard 1. The line then runs to box 2 which has tstat 2 and runs a 2nd baseboard. I just need to know if I wired it correctly. I am getting some wired voltage at baseboard 1 when breaker is on but tstat is off. I attached a diagram as well (sorry if it’s messy). Any help is greatly appreciated.
Dwg looks good. The white wires in your boxes need to be identified as hot conductors. Either black marker or tape !
Just to confirm, at the breaker panel, you are using a double pole breaker, with the black and white wires fed from each side, right ?

Since you're using a single pole stat, it only turns off 1 of the 2 conductors. So you still have 120V to ground on the white wire at the baseboard.
If you measure between the 2 hots, you may see some small voltage on your meter, this is what we call a ghost reading.
If you measure (with the stat off) between the white and ground wire, you should get 120V , and between the black and ground wire you should be reading zero.
~~ Ford Ford Ford Ford Ford Ford :mrgreen: ~~

Post Reply