Contactors

[i=p/u]

Just put less lights on the circuit 1.8 times less, forget contractors.....

Imstarting to get nosey around contactors out in field but still can't work it out quick enough , by time other guy has done what he had to do. Futures bright

 

[johnboy6083]

As far as I'm aware (I'm happy to be re-educated though) this is why we use the 1.8 factor when calculating Ib for fluorescent lights. This means that the cables and switchgear are then sized to account for pf, harmonics and the inductance on the circuits. As Marvo has mentioned, AC3 contactors should be used.

 

[i=p/u]

Say a standard 10A mcb and 58w 5ft tubes you could switch over 20 lamps per per 10A breaker .

i also used contactor once to power 3 x 250 metal halide fittings and my boss said fit contactor but were the only lights on the 10A mcb, which I thought didn't even need it.

 

[i=p/u]

Does the contactor take away inrush by being at correct voltage

 

[infinity]

No the contactor allows the load to be switched by a lower rated switching device

 

[infinity]

Old thread!!!!!

 

[i=p/u]

In my case i used a 3kw 24 hr heating timer to switch contactor

would you of used contactor? Do you think was needed

 

[i=p/u]

Old thread I know, just reading bits

 

[Knobhead]

If you want to read old crap do so. Just don’t regurgitate it for everyone to see.

 

[Darkwood]

LOL ... so forgot i even replied to this be reading it i was still on form 3 yrs ago :rolleyes2: lol... i think we are just geting old ......

Drunk .com at the mo!

 

[i=p/u]

spring chicken with 40 years left to do electrical work, now dont be sick,, and tell me me lots about contactors to give me better understanding of their uses and where and when to apply.. do as your told tony for once ya skitter

im getting their

 

[Silly Sausage]

i=p/u,
check this out...
Eaton - Wiring Manual

There are loads of examples of contactor applications within.
You can get the actual book for free as well, you'll have to find that yourself.

 

[Silly Sausage]

The above being originally courtesy of Tony! Cheers Cock.

I got a hard copy, pity it isn't A4 size.

 

[Knobhead]

Just put less lights on the circuit 1.8 times less, forget contractors.....

Imstarting to get nosey around contactors out in field but still can't work it out quick enough , by time other guy has done what he had to do. Futures bright

1.8 less would be the inverse = 0.55