multiple loads from secondary

[surwiseass]

Are you permitted to supply multiple loads all with different size conductors from a transformer secondary without providing overcurrent protection at the transformer secondary? I think the answer is yes as per article 240.21(c) (1) - (6)

 

[iwire]

Yes, but each set of conductors must originate at the transformer terminals.

You can not run one large set of conductors out and make taps off of that one set.

 

[iwire]

Note 2 of Table 450.3(B) is worth a look.

 

[Fast__Eddie]

so, this cannot be done?

 

[iwire]

so, this cannot be done?

Nope, in that picture they have 'tapped' a tap.

It is a violation.

 

[chevyx92]

You can not run one large set of conductors out and make taps off of that one set.

What article is that?

 

[don_resqcapt19]

What article is that?

240.21 Location in Circuit.
Overcurrent protection shall be provided in each ungrounded circuit conductor and shall be located at the point where the conductors receive their supply except as specified in 240.21(A) through (H). Conductors supplied under the provisions of 240.21(A) through (H) shall not supply another conductor except through an overcurrent protective device meeting the requirements of 240.4.

 

[Fast__Eddie]

I thought those conductors were "transformer secondary conductors", not "tap conductors". The way I see this is, neither are taps due to the fact the 240.21(C) specifically address Transformer Secondary conductors seperately from Taps. Either way i dont like it.:-?

and of course the conductors from the secondary to the polaris tap needs to be large enough to carry the load.

 

[Fast__Eddie]

Just reread 240.21 - I change my thoughts, I've been educated

 

[Pierre C Belarge]

Here is is another example of "tapping a tap" from the secondary of a transformer.




The secondary of this transformer has 1 set of conductors (the "tap") that is installed into the trough. In the trough the 1 set is then "tapped" to supply each panel. This is not permitted. Each panel would need to have a separate set of conductors supplying them from the secondary of the transformer.

 

[roger]

Here is is another example of "tapping a tap" from the secondary of a transformer.




The secondary of this transformer has 1 set of conductors (the "tap") that is installed into the trough. In the trough the 1 set is then "tapped" to supply each panel. This is not permitted. Each panel would need to have a separate set of conductors supplying them from the secondary of the transformer.

Pierre, how do you know that these are not just "spliced" conductors?


Roger

 

[Pierre C Belarge]

Roger
I inspected it.

I should add that the conductors supplying the panels are smaller than the conductors from the transformers.