Can someone do these calcs?

Steve · 23 Sep 2010

What size breaker would you use for:

10 x 70w warm white HQI spotlamps, switched on and off together via a contactor?

Cheers.

1john · 23 Sep 2010

10 x 70 = 700

700 / 230 = 3.04 A

Steve · 23 Sep 2010

And startup current?

holmslaw · 23 Sep 2010

Steve · 23 Sep 2010

holmslaw said:
Use a latching lighting contactor with retractive switches, will save you a lot of grief.

Sorry? These are lights that are already installed, and the breaker keeps tripping. They are remotely switched by a management system.

I cant remember the rating of the breaker its currently on. But what would YOU put it on?

PrenticeBoyofDerry · 23 Sep 2010

If it's the start up current that's causing the trip a type C instaed of B maybe!

ricicle · 23 Sep 2010

PrenticeBoyofDerry said:
If it's the start up current that's causing the trip a type C instaed of B maybe!

Remembering to check that the Zs complies for disconnection

BSBS · 23 Sep 2010

Your only going to be able to change the breaker if the existing cable size / installation method will alllow you to uprate the breaker along with the Earth loop readings allowing you to fit a type C.

But if that circuit was being wired from new i'd probably design for a 10A Type C

holmslaw · 23 Sep 2010

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Can someone do these calcs?

holmslaw

holmslaw

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