Circuit breakers tripping?

[koster_irrigation]

Got a couple of customers with 600-900w transformers tripping breakers. Amp meter reads avg. 6 amps 7.5 right when it clicks on.
All wiring been checked. All lights checked for proper voltage. All wiring sized and calculated correctly.

Nothing else installed on the breaker. Just a receptacle dropped out of a panel.

Discuss.

Inrush amps & amps pulling.

Anyone run across similar problems.

[koster_irrigation]

my suppliers (John Deere & Smith Turf) and the manufacturer (vista) are coming up with limited answers.....

[landscapelight]

Primary or secondary (which one) breakers tripping?

[landscapelight]

How are you switching the transformers?

15 or 20 amp primary breaker?

[YardPro]

is it on the same circut as the bathroom???
if so when a hair dryer is used at night it will kick off the breaker if your lights are on as well..

[landscapelight]

Yard pro, initial post stated dedicated circuit

[niteliters]

how far is the outlet located away from the panel??? if more than 15ft that should not be a problem..if closer that could be causing primary to trip.

[niteliters]

if the secondary is tripping and you are using a multi tap transformer do what you've done and measure the cable for amperage. the amperage result should be multiplied by the voltage tap to which the cable run is connected. this will determine the actual (dynamic) wattage requirment.
hope this helps
chris

[koster_irrigation]

Breaker on service panel tripping. 20amp breaker SqrD QO

Another customer GE 20amp beside service panel doing same thing.

Transformer mounted beside the service panel.

Dedicated breaker.

[niteliters]

distance from the transformer to a primary breaker does not matter most of the time, but to avoid potential nuisance tripping the transformer should be mounted 15' away from primary breaker.