Carnival Shunt Trip Switch

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Can you give me a little more information as to what you are after?

525.21(A) requires a disconnecting means for each ride located within sight and within 6ft of the operator. A shunt trip device that opens the fused disconnect or circuit breaker when a switch located in the ride operator's console is closed shall be a permissible method of opening the circuit.

Does this help?

Chris
 
We recently inspected a ride where the factory installed push button switch had been replaced with a standard on/off 15-amp switch. I just wondered if this switch could be used for this application, or if there were specific requirements.
 
electadmin said:
We recently inspected a ride where the factory installed push button switch had been replaced with a standard on/off 15-amp switch. I just wondered if this switch could be used for this application, or if there were specific requirements.
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I'd prefer a mushroom head PB but I don't see a NEC problem with using a light switch for this purpose.

Most states have specific carnival rules that might specify more stringent requirements than the NEC.
 
I agree with Petersonra.

525.21(A) doesn't specify what type of switch must be used in conjuntion with the shunt trip device. As long a standard 15 amp snap switch will actuate the shunt trip then I feel section 525.21(A) is satisified.

JMHO,

Chris
 
To me, this sounds like a violation of the UL listing (or whoever lists or tests or inspects carnival equipment) of the equipment. They can't just replace parts at random with whatever they have on hand.

If they replaced a metal brace with a 2x4, I don't think you would look for a code section prohibiting 2x4's as structural bracing. I don't really see any difference.

Steve
 
electadmin said:
Can someone provide information for the requirements of the switch as used in a shunt trip for an amusement ride?
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Who's requirements?

I can see there being an issue with a non-momentary-contact switch unless the shunt-trip has aux. contacts that immediately remove the coil power.
 
steve66 said:
To me, this sounds like a violation of the UL listing (or whoever lists or tests or inspects carnival equipment) of the equipment. They can't just replace parts at random with whatever they have on hand.
Click to expand...

Are you suggesting the replacement switch has to be an exact duplicate? My guess is that the instructions probably do not specify anything in particular for the switch. In fact, it seems quite likely that the switch is something that is not even part of the rest of the equipment package.
 
If the shunt trip is for an emergency stop function then I would suggest that it is the wrong tool for the job, as failure of the shunt trip circuit will leave the attraction operating with no possibility of an emergency stop, so the system fails dangerous. Not at all good, depending on the attraction, potentially multiply lethal.

A series emergency stop would be a better fit as it would fail safe.
 
No. A shunt trip breaker is a special breaker with a remote means to open the breaker (such as an ansul system).

An emergency stop could be as simple as a mushroom pushbutton that disconnects the power, similar to a switch opening.
 
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