Fork Lift Charger

[highspark]

I am totally confused by all this. Never again. The run will be 25m. Do them figures make sense to you. Napit tech guy says I need an output wattage......this is not on the charger....

 

[plugsandsparks]

Forget that its a red herring. The output wattage you have, its 48X80 but so what. You are putting in a supply feed to the charger, as i have said, the best advice i can give and the only advice i would listen to would be from the manufacturer of the charger. Its not hard, i am ringing manufacturers all the time, just get the make and model number of the charger, google it, get phone number, ring up and ask for technical support, you never know they may be sophisticated and have all their docs online.
Once you have the breaker size, its easy from there.
Sounds like you are making this harder than it needs to be.

 

[Amp David]

Merlin MCBs have a more tolerant max Zs too. Not sure what model MCB but check on there site.

 

[Brightspark2]

Well thats an interesting set of figures. Looks like you are going to be putting in a 32A supply. Now it gets interesting, if it can live with a C32 breaker, you are aiming for a Zs of 0.58. However a R1+R2 distance of 50m is going to give a resistance of 0.46 using 4mm SWA, so unless your Zdb is less that 0.12 you wont get it in spec.
If you go 6mm SWA then r1+r2 is going to be about 0.31 which should be good enough, but you need to check the Zdb first before choosing the cable.
If you need a D32 - oh dear suggest move the charging point closer to the DB - LOL.

I would ring the manufacturere or get the installation PDF off the internet and confirm what breaker size they recommend.
Hope this helps

As above.


Ignore the output ratings, concentrate on the 26.7A, 32A supply, 32A isolator, from experiance it should be fine on a C type breaker. Dont get confused its pretty striaght forward.

 

[highspark]

Iet forum lads are saying 26.7A aswell but I need to be sure. Probably right need to get intouch with manufacturer. Customers are a nightmare though they don't have a clue!

 

[Brightspark2]

You could ring them for further confirmation, but the input ratings are the ones you want. Theres a transformer inside. You design the circuit on the rating of the unit not the output rating.

If you where going to install a lighting cicuit using SELV transformers you dont design the circuit for the 12v output side of the transformers. This is just a bigger version lol.

Design the circuit using 26.7A...Ive installed and worked with a lot of these....

 

[plugsandsparks]

Odds on favourite then is C32 and 6mmsq on an isolater, let us know what the calcs turn up be interested to see how close we can get from an armchair.

 

[Amp David]

I dont even think a 32 AmpC type breaker would hold. The one I did previously had a massive transformer inside.

 

[plugsandsparks]

I dont even think a 32 AmpC type breaker would hold. The one I did previously had a massive transformer inside.

How big? - is this a fish story lol
If he has to go to say C40 or C45 poor lad is running out of options and the cable is getting bigger and bigger. One phone call to Chloride or whoever could save a stack of cash

 

[Amp David]

Big enough to take out the original C40 that was fitted when firstly energising it.

Chloride's advice was D80!

 

[plugsandsparks]

Big enough to take out the original C40 that was fitted when firstly energising it.

Chloride's advice was D80!

Ha ha, did you manage to find one ?

 

[Amp David]

No, customer wasn't willing to pay up for the job.

 

[Knobhead]

Glad I stayed out of this, I'd be hopping mad by now. If the OP (AKA Fonz on IET) isn’t happy he should double check on the IET again.

 

[highspark]

Tonys wit is marvelous. He has far too much time on his hands....Anyhow I've been to look how this was installed today. The current installation has a 6mm SWA on a run of about 20m. Its mcb is 32amp type D. Clamped it when battery only had around 15% of life left in it and it drew 20amp. So looks like plugs and sparks is a top man!!!

 

[Knobhead]

I'm retired, I'm entitled to time.
Go about it how you like, but as far as I'm concerned your on your own (with your mates at the EIT).