[simpits-tech] RE: CP Clock

[Ben Jones]

Really where the fuse is in the circuit between the supply and the load is not a real worry, 
if the fuse is only protecting the cable that it is connected into , the physical placement at the supply end middle or the load end of the cable , is  irrevelant  only if the fuse is correctly rated for the wire current carrying capacity, 

eg if the cable is capable of carring 10 amps a safe thing to do is set the fuse size to about 8 amps for safety sake , but when cable is produce it has saftey margins built in so a cable that is labelled 10 amps max , you can assume that for short to medium time periods you could pull about 14 amps , SHORT TIME ONLY !!
if you have a load which pulls 7 amps through a 10a cable it is safe to set the fuse for 10a trip/blow, because if the safety margin in the cable.

never rely on the safety margin of tha cable as this is when you get in to the area where the (usally ) pvc sofens then melts and the bang shorts,to either earth of a close cable .

i was witness to this ona industrial site where the cable was max rated to 400 amps at 5KV the techo/operators increased the load slowly to fool the circuit protection ended up pulling 480 amps through the cable for 5 hours, they did this multiple times throughout the day the ka boom it went up and vapourised a remote water pumping station to the ground ..Luckly the station was remote and un manned.



BEN   JONES 
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bjones@pipecomp.com.au
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-----Original Message-----
From: Marv De Beque [mailto:mdebeque@woh.rr.com]
Subject: Re: [simpits-tech] RE: CP Clock

>Put the fuse as close to voltage source as you can.
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