48V hardware [RE-wrenches]

[Drake Chamberlin - Electrical Energy]

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The AC pull outs work fine, and are just copper (or copper 
coated)  contacts.  It couldn't be simpler or more straight forward.  Yet, 
I did get nicked on one of these on a 24 volt installation here in Colorado 
by a state inspector.

Drake

At 08:53 PM 07/14/2001 -0700, you wrote:
>Hi Allan,
>
>I have used a standard Air Conditioning pull out ( either fused or non 
>fused, and 60 amp rated), they cost $13 and have two poles.  ( in fact I 
>made a really inexpensive DPDT disconnect by installing two and removing 
>one of the pull out handles, that way they can only use one or the other).
>
>As to the float switch, does the float switch have to be 48v,and if so 
>what amperage are you talking about.  I have used the standard float 
>switches at 12 and 24v without problems ( running an aux relay).  Could 
>you use lower voltage if you are worried about the 48v nominal causing 
>severe arcing?
>
>
>thanks,
>
>jay
>
>Peltz Power
>
>"Allan Sindelar, Positive Energy, Inc." wrote:
>>Wrenches,1. What has proven to be the best approach you have found for 
>>small load centers or disconnects for 48VDC nominal systems? For example, 
>>I need two single pole low-amperage disconnects for a 48VDC (nominal) 
>>subpanel, for two pump loads in a 6' by 6' well pit (so needs raintight, 
>>I believe). If I use 1P breakers I can disconnect each load 
>>independently, which is desireable; but a 2P fused or unfused disconnect 
>>may be cheaper and simpler to obtain. Best proven methods, please?I have 
>>saved and reread earlier postings on QO breeaker DC ratings. Nothing 
>>seems appropriate here except Square D FHL16015 breakers in a FA100RB 
>>enclosure. But my supply house quote for two breakers in one box is $480. 
>>Ouch.Has anyone successfully adapted Heinemann CF/Philips Airpax/Carling 
>>125VDC breakers to a standard NEMA 3R enclosure for use as a DC load 
>>center? 2. For the same application, I am using float switches to control 
>>48V mercury displacement relays for these DC pumps. Can anyone suggest a 
>>source of SPST, SPDT, and DPDT bat (or any style) switches suitable for 
>>48VDC nominal, low current loads? These would be for a custom relay 
>>control enclosure with override and remote low tank alarm signal 
>>circuits. Thank you.Allan at Pos Energy
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