Pool contractor wants a 60 amp sub feed quoted for the job.

With all pool equipment, a small kitchenette and a small AC unit I come up with close to 40 amps.

Am on the fence between pulling #4 or #6 thhn.

#6 would suffice, but VD comes into play..

#4 would cover it but then I'm upsizing raceway from 3/4 to 1"

120/240V single phase is the voltage

Opinions welcome. ]]>

I have an MCC with 11 starters (DOL) each 7.5KW and as per datasheet LRA = 102.85 A and FLA = 14.4 A.

I need to size the main breaker for those starters.

So what i did actually. simply calculate the total FLA which will be 14.4 x 11 = 158.4 A. And keeping in view the 120% rule which makes 189.6 A.

So i selected 200A breaker for the mains incomer.

Can some body validate the calculation. Or i need to consider other factors too.

Thanks in anticipation. ]]>

thank you. ]]>

360A X 125% = 450A + 130A @ 100% = 580A

580A X 125% = 725A = (3) 250MCM = 765A

(2) 500MCM = 760A

By this math, I can use a 600A main service disconnect but when I apply the 80% rule to this thermal magnetic breaker I only have 480A to use. As you can see in my initial explanation, I have a 490A load. Should I just be concerned with the continuous load when applying my calculations? I know in the real world a 600A service will be fine but I am concerned with an inspector applying the 80% rule and saying that the service isn't large enough.

Any help would be appreciated. Thanks ]]>

I require a single phase ac supply in my LAB with volatge rating (1000 V)rms ,current rating 600 A. 3 phase 415v supply is available in my LAB.please tell me the best methods to convert my 3 phase supply in to single phase.Important thing is i must maintain balanced load on the 3 phase side.

Regards

sahitya ]]>

Just curious for ampacity reasons. ]]>

Got a 75kva 208 wye transformer. so 75kva will give me 208Amps, need to ligt up 48 1'000watt lamps single phase.

48 lamps @ 1'000watts is 230amps:blink: But! Its a 3phase system . So does the 1.732 rule apply? ]]>

in part IV of article 220, optional feeder and service load calculation, it says part IV is for feeder wire with a maximum ampacity of 100 or greater.

1. wouldn't this section apply to all feeders since a service must be 100 AMP or greater?

2. and could part IV have been used to calculate the load for annex D example d1a?

3. if either standard or optional feeder calculation can be used to calculate the load then how do they have multiple choice exams if there's more than one answer? ]]>

-How can I measure the voltage the piston is giving off?

-Could there be a rectifiers inside the plastic casing?

- How many turns do I make? I have two unknown , N (number of turns) and L (induction value)

any help with this would be wonderful

Thank you ]]>