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Level 3 2365 design project need info on Q3

Discuss Level 3 2365 design project need info on Q3 in the Electrician Courses : Electrical Quals area at ElectriciansForums.net

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ajama21

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Hi guys, hope you are well. I am currently doing a level 3 2365 design project hotel, swimming pool cafe and I therefore need help on what to do on Q3. If anyone can show me a direction on what to do or show an example of how to do it would be much appreciated
Thanks
 
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James said:
What is the question?
Click to expand...
Select with the aid of manufacturers data, a suitable range of circuit protective devices for this contract. your selection should be based on the following:
Prospective short circuit currents
Requirements for additional protection and special locations.
Thanks for the reply.
 
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So what does having 3.7 KA at source, assuming the pool/cafe is the source tell you about the rating of the protective devices through the installation?
 
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westward10 said:
So what does having 3.7 KA at source, assuming the pool/cafe is the source tell you about the rating of the protective devices through the installation?
Click to expand...
westward10 said:
So what does having 3.7 KA at source, assuming the pool/cafe is the source tell you about the rating of the protective devices through the installation?
Click to expand...
thats what im confused about. I dont know the rating to use for it or what circuit breakers to use
 
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Circuit breakers have a maximum breaking capacity normally identified on them in amps. This is normally seen in a box on the device such as 6000, this means 6000A or 6KA. To install a 6 KA device in a distribution board where the PFC is 9KA could result in a damaged device or worse if a fault of such magnitude occurs so the rating of your device must be higher than the PFC at the point it is installed.
Your PFC is 3.7KA or 3700A so your devices must be rated above this. PFC is highest at source and reducing through the installation due to circuit impedances bringing it down.
 
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westward10 said:
Circuit breakers have a maximum breaking capacity normally identified on them in amps. This is normally seen in a box on the device such as 6000, this means 6000A or 6KA. To install a 6 KA device in a distribution board where the PFC is 9KA could result in a damaged device or worse if a fault of such magnitude occurs so the rating of your device must be higher than the PFC at the point it is installed.
Your PFC is 3.7KA or 3700A so your devices must be rated above this. PFC is highest at source and reducing through the installation due to circuit impedances bringing it down.
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Thanks for this info. What type of devices would be beneficial in this case sauna, kitchen, fridges etc..?
 
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You need to do some circuit design to establish the current rating of each protective device then decide what type you need and whether RCD protection is required.
 
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westward10 said:
You need to do some circuit design to establish the current rating of each protective device then decide what type you need and whether RCD protection is required.
Click to expand...
Ive already done the circuit designs. Ive looked into circuit protective device of 61009-1s, 60898s, do i select each of those types for sauna, fridges, pool etc.. take data of them from the manufacturers website and add them to the assignment?
 
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Yes add as much info as possible but not for every one. If you have a board with 36 devices just show what you have selected in terms of mcbs and rcbos. For example if you have twenty 32A type C devices just show one.
 
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westward10 said:
Yes add as much info as possible but not for every one. If you have a board with 36 devices just show what you have selected in terms of mcbs and rcbos. For example if you have twenty 32A type C devices just show one.
Click to expand...
hi mate sorry for bragging this. i was gonna ask one more thing.in the question it also mentions requirements for additional protection and special locations. What would I have to do for this?
 

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