Wire type and size for light

[HunterDan]

So I set a pole off my driveway for a 150 watt HPS light. I'll be running a new circuit from the panel, so it will be run about 15' inside the basement, then through the foundation and down into conduit 80' out to the pole.

My question is, can I run romex from the panel, through the foundation into a junction box, then use thhn through conduit out to the pole? If like to run 2 circuits up the pole, one straight up to feed the disk to dawn HPS light, and one on a switch to feed a flood light that I only want on when I need it.

How can I accomplish this?

 

[sberry]

Use 12/3 conductor cable , UF direct burial or thru pipe but for underground. This is a single circuit with a switched wire for the second device.

 

[HunterDan]

Use 12/3 conductor cable , UF direct burial or thru pipe but for underground. This is a single circuit with a switched wire for the second device.

Something like this?

https://www.anixter.com/en_us/products/Flexible-Robotic-Cable/p/4A-1203

 

[theoldwizard1]

Something like this?

https://www.anixter.com/en_us/products/Flexible-Robotic-Cable/p/4A-1203

No ! That is like extension cord.

Like this 12/3 UF

 

[theoldwizard1]

My question is, can I run romex from the panel, through the foundation into a junction box, then use thhn through conduit out to the pole?

Yes, but you can also run underground Romex (UF-B) all the way from the panel. through the conduit, up the pole. You might need a slightly larger conduit. Using indoor rated Romex (NM-B) to a junction box and then single conductor wire (THWN/XHHW) through your conduit. If you go the single conductor route, you MUST use 3 different colored wires, black (hot), whire (neutral) and green (ground).

If like to run 2 circuits up the pole, one straight up to feed the disk to dawn HPS light, and one on a switch to feed a flood light that I only want on when I need it.

Assumption #1, the HPS light, the flood light and the switch for the flood light are ALL mounted on the pole, correct ?

Did your really mean "2 circuits" ? In other words, 2 breakers ? If yes, then you need an addition conductor like sberry said in order to make a multi-wire branch circuit. (2 hots, black and red, neutral, white and ground, green. The breakers must be next to each other in the panel, on different legs. No tandem breaker allowed.)

If no, then you do not need the extra hot. Run the wires into your outdoor rated junction box on your pole with an outdoor rated switch. Cut the hot wire and splice in a pig tail that will go to the switch and the hot to the HPS light. Cut the neutral and splice in the neutral for the HPS and the neutral for the flood. repeat the last step for the ground, but include an extra pigtail for the switch.

If you want the switch in the house, it is totally different !

 

[HunterDan]

Yea I thought that cable was wrong, thanks!!

Yes, all 3 will be on the same pole. No, didn't mean 2 circuits, just one circuit ran to the pole, then one straight to the light, and one to a switch for the flood light.

I'll use that cable, it will be nice going from the panel right to the pole.

Thanks again!

Yes, but you can also run underground Romex (UF-B) all the way from the panel. through the conduit, up the pole. You might need a slightly larger conduit. Using indoor rated Romex (NM-B) to a junction box and then single conductor wire (THWN/XHHW) through your conduit. If you go the single conductor route, you MUST use 3 different colored wires, black (hot), whire (neutral) and green (ground).



Assumption #1, the HPS light, the flood light and the switch for the flood light are ALL mounted on the pole, correct ?

Did your really mean "2 circuits" ? In other words, 2 breakers ? If yes, then you need an addition conductor like sberry said in order to make a multi-wire branch circuit. (2 hots, black and red, neutral, white and ground, green. The breakers must be next to each other in the panel, on different legs. No tandem breaker allowed.)

If no, then you do not need the extra hot. Run the wires into your outdoor rated junction box on your pole with an outdoor rated switch. Cut the hot wire and splice in a pig tail that will go to the switch and the hot to the HPS light. Cut the neutral and splice in the neutral for the HPS and the neutral for the flood. repeat the last step for the ground, but include an extra pigtail for the switch.

If you want the switch in the house, it is totally different !

 

[HunterDan]

What size breaker should I use?

 

[wyliesdiesels]

several choices here as have already been said:

1) run NM-b (Romex is a brand) to a j box near foundation hole. Run UF-B (outdoor direct burial rated NM-b) directly into the ground up to the pole or in conduit(I prefer conduit).

or

2) NM-b to j box, THWN in conduit from box to pole.

or

3) UF-b ran the entire length from panel to pole

or

4) THWN in conduit entire length

If #12 use 20a breaker

 

[HunterDan]

Perfect. Can always count on you guys, thanks!!