Safety grounds - several questions
Safety grounds - several questions
(OP)
We're putting together a system to test our product. We have a 24 VDC isolated power supply that controls a motor. A hand held, plastic pendant switch uses the 24 volts to turn a motor in either direction. I assume that the low side of the 24 VDC control system should be attached to an earth ground for safety. The question is, how robust (current carrying ability) should the earth (and therefore, power supply low) connections and wiring be?
The 24 VDC control only provides 15 mA so we're using small wires and terminal blocks. But that would seem to be inconsistent with the need to provide a robust path to ground in the case of a fault. So how can you get by with low current wiring and terminal blocks and still satisfy the grounding needs?
The 24 VDC control only provides 15 mA so we're using small wires and terminal blocks. But that would seem to be inconsistent with the need to provide a robust path to ground in the case of a fault. So how can you get by with low current wiring and terminal blocks and still satisfy the grounding needs?





RE: Safety grounds - several questions
Not fluent in US code. But can imagine there are similar rules.
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Safety grounds - several questions
RE: Safety grounds - several questions
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Safety grounds - several questions
RE: Safety grounds - several questions
The value of 48V sticks in my head, but I make no guarantees that's the reason, so I never posted...
Dan - Owner

http://www.Hi-TecDesigns.com
RE: Safety grounds - several questions
RE: Safety grounds - several questions
RE: Safety grounds - several questions
As long as the extra low voltage mains isolating transformer is of an approved type, with a split insulated bobbin, and adequate approved insulation, the secondary circuit need not be grounded.