# Thread: Fast Delta Calc

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## Fast Delta Calc

Hi ,
Do you think that I can estimate a remodeled warehouse load supplied by the existing 120/240V, 4wire, 3 phase service
this way ?????????;

General ltg w/ 25% LCL = 2400VA @ 120/240v, 1 ph. = 10A
Gen. use recept @ 100= 2400VA= @ 120/240, 1ph= 10A
special . use recept @ 100= 4800VA= @ 120/240, 1ph= 20A
miscel. @ 100= 1200VA= @ 120/240, 1ph= 5A

Motorized load @ 100= 12,450VA @ 415V, 1ph= 30A (some used the high leg)
roof mtd AC load @ 100= 12,450VA @ 415V, 3ph= 30A

sub total , 2pole+3 ph loads= 60A
sub total, 1 ph, grounded loads= 45A
Largest motor @ 25%= 2075VA @ 415V= 5 A
120% PF for existing-old motorized loads= (13000 x 1.2= 15,600 / 415V= 38A

Concluded that;
minimum service @ 120/240, 3 ph, 4w required is; 148A

Thank you

2. Originally Posted by Toros
Hi ,

roof mtd AC load @ 100= 12,450VA @ 415V, 3ph= 30A

...

Concluded that;
minimum service @ 120/240, 3 ph, 4w required is; 148A

Where is the 415V coming from?

3. Originally Posted by david luchini
Where is the 415V coming from?
One might also wonder abput this:

"the existing 120/240V, 4wire, 3 phase? service "

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Originally Posted by david luchini
Where is the 415V coming from?
240v x 1.73=415 v

5. Originally Posted by Toros
240v x 1.73=415 v
Sounds like EU voltages. Except for the 120V.

6. Originally Posted by Besoeker
Sounds like EU voltages. Except for the 120V.
Its this:

Delta high leg is great for long runs because standard 208-230 volt motors are unlikely to encounter under voltage issues.

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mbrooke

Excellent graphics....can I ask what program was used to generate, or was this all cut and paste ?

8. Originally Posted by mbrooke
Its this:

Delta high leg is great for long runs because standard 208-230 volt motors are unlikely to encounter under voltage issues.
But no mention of 415V.

9. Originally Posted by MyCleveland
mbrooke

Excellent graphics....can I ask what program was used to generate, or was this all cut and paste ?
They are Mike Holt's. Not sure what program he or his team made them on, but they sure are the best graphics bar none.

Originally Posted by Besoeker
But no mention of 415V.
Oppps- missed that But to be fair you do get 415 volts L-N on a 240/480 delta.

10. Originally Posted by mbrooke
They are Mike Holt's. Not sure what program he or his team made them on, but they sure are the best graphics bar none.

Oppps- missed that But to be fair you do get 415 volts L-N on a 240/480 delta.
Don't see how but then I'm thick according to one of the mods here.

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