Park lights 120 vac to 15vac xfmr

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hhsting

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I understand i had similar post before that is now closed but I still cannot understand the concept and left me more confused with additional new questions and some old still not understanding it

For lighting in park, going from 120VAC to 15VAC, WAC magnetic transformer is used. The 120vac side transformer cord is connected to gfci receptacle. Please see the link below for the transformer being used and transformer spec sheet link. In the transformer being used link their is also transformer instruction which opens up lower right hand corner. The light which the transformer is used for link below as well. We are providing the transformer secondary cables in conduit outdoor some conduit come up ground and do go onside of building walls.



Transformer link:

WAC Lighting

WAC Lighting offers architectural products, decorative lighting, and landscape lighting focuses on addressing known problems or meeting unfulfilled needs with lighting solutions in commercial, residential, and hospitality settings.
www.waclighting.com www.waclighting.com


Transformer Spec sheet link:



Light the transformer is used for link:



Questions:

1. If their is a fault on 15vac and someone getting shocked then primary gfci would not see it. Previous post said it just an appliance and not under NEC for secondary breaker size but i dont follow how? We are still providing secondary wiring from the transformer to lights. So in order to protect them where NEC would the 15vac transformer secondary breaker sizing be?

2. Same issue as #1 with secondary cable sizing. We are providing secondary cable to lights. Where in NEC 2017 would sizing secondary cable be for 15vac side of transformer?

3. If a fault occurs on 15vac secondary someone getting shocked then primary will not see it. Previous posts said 411 does not require ground but then how can any breaker trip if someone is getting shocked?I dont follow can someone please explain.

4. Is Equipment grounding conductor (EGC) required for secondary side? I am getting confused by language 411 and 250 between is code talking about EGC or grounding electrode

Thanks for your opinion
 
Last edited:
hhsting said:
1. If their is a fault on 15vac and someone getting shocked then primary gfci would not see it.
Click to expand...

Nobody is going to get shocked with 15V. Further, the reason low voltage secondaries aren't grounded is so you can't get shocked, assuming the voltage were high enough
hhsting said:
2. Same issue as #1 with secondary cable sizing. We are providing secondary cable to lights. Where in NEC 2017 would sizing secondary cable be for 15vac side of transformer?
Click to expand...
Nowhere. Landscape lighting isn't covered by the NEC in that respect. Refer to the manufacturers instructions for recommended conductor size vs length.
hhsting said:
3. If a fault occurs on 15vac secondary someone getting shocked then primary will not see it. Previous posts said 411 does not require ground but then how can any breaker trip if someone is getting shocked?I dont follow can someone please explain.
Click to expand...

hhsting said:
4. Is Equipment grounding conductor (EGC) required for secondary side? I am getting confused by language 411 and 250 between is code talking about EGC or grounding electrode
Click to expand...

See my reply to #1.

-Hal
 
You are quite correct on some of the physics of the situation.

A fault on the secondary will show up as a load on the primary, so a primary side GFCI will not see a fault on the secondary side.

I believe you are getting hung up on the domain in which particular rules are applicable. The rules for low voltage systems (less than 30V or less than 50V depending upon whose rules are being applied) are different than those for 120V (or more). The rules for power limited systems, the rules for plugged in devices, etc. are different than the rules for building wiring.

Jon
 
Don's final post in the earlier thread sums it up and should resolve your confusion::::

It is cord and plug connected, and the authority for code enforcement stops at the receptacle. There are no provisions of the code that apply to the device in this thread.
 
hhsting said:
I understand i had similar post before that is now closed but I still cannot understand the concept and left me more confused with additional new questions and some old still not understanding it

For lighting in park, going from 120VAC to 15VAC, WAC magnetic transformer is used. The 120vac side transformer cord is connected to gfci receptacle. Please see the link below for the transformer being used and transformer spec sheet link. In the transformer being used link their is also transformer instruction which opens up lower right hand corner. The light which the transformer is used for link below as well. We are providing the transformer secondary cables in conduit outdoor some conduit come up ground and do go onside of building walls.



Transformer link:

WAC Lighting

WAC Lighting offers architectural products, decorative lighting, and landscape lighting focuses on addressing known problems or meeting unfulfilled needs with lighting solutions in commercial, residential, and hospitality settings.
www.waclighting.com www.waclighting.com


Transformer Spec sheet link:



Light the transformer is used for link:



Questions:

1. If their is a fault on 15vac and someone getting shocked then primary gfci would not see it. Previous post said it just an appliance and not under NEC for secondary breaker size but i dont follow how? We are still providing secondary wiring from the transformer to lights. So in order to protect them where NEC would the 15vac transformer secondary breaker sizing be?

2. Same issue as #1 with secondary cable sizing. We are providing secondary cable to lights. Where in NEC 2017 would sizing secondary cable be for 15vac side of transformer?

3. If a fault occurs on 15vac secondary someone getting shocked then primary will not see it. Previous posts said 411 does not require ground but then how can any breaker trip if someone is getting shocked?I dont follow can someone please explain.

4. Is Equipment grounding conductor (EGC) required for secondary side? I am getting confused by language 411 and 250 between is code talking about EGC or grounding electrode

Thanks for your opinion
Click to expand...
Please read and try to understand the comments in the previous thread.
 
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