12volt secondary circuit fusing

[pierre]

This is a question to try and straighten out some details I am working on.


Lets say one has a 600 VA rated, 12 volt secondary transformer being used as part of outdoor lighting.

1. Can I run 2 "legs" from the secondary of 1 transformer, thus keeping my amperage on the secondary to 25 amps per leg as per Art 411?

or

2. Do I need to install 2-300 VA transformers to keep the secondary at 25 amps?


If I decide to install 1 leg:
3. what size fusing would be required on the secondary side?

4. What method would one use to provide this fused protection?


Thanks

 

[frenchelectrican]

Re: 12volt secondary circuit fusing

Pierre:

ok for this LV transformer i will try to answer much as i can withen the code guide line.

for 600VA 12 v secondary transformer you can have each circuit fused at 25 amp secondary for each one other wise there is a beast that have "center tapped " transformer which it is 12/24 volt. you can fused each side at max of 25 amps this is rather pretty common with pretty large transfomer set up.

the other option is run a pair of 300 VA 12 volt transformer which it will limted at 25 amp.

don't get me wrong but if my memory serve me right that most 300 VA's do have ocpd on seconadary side but not on 600 VA unless it is speficed [set up] for it

the type of ocpd useally either fuse or circuit breaker type.

I hope i get this set up right for you Pierre.


Merci, Marc

 

[pierre]

Re: 12volt secondary circuit fusing

Merci Marc
It has been a while since I have heard from you. I hope all is well!!!

"don't get me wrong but if my memory serve me right that most 300 VA's do have ocpd on seconadary side but not on 600 VA unless it is speficed [set up] for it"

I have not seen any of these transformers with the protection you mention, unless you are speaking of "inherent" protection.