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bobbych
Joined: 17 Mar 2006
Posts: 32
Location: NORTH EAST UK
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 Posted: Fri Jul 11, 2008 11:46 am Post subject: 17th Ed test Q |
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I am looking at some study Q's b4 my 17th Ed test and cant find the following in the regs.
Q. Where agenerating set is used as an additional source of supply in parallel with other sources, protection shall remain effective in all situations against overcurrent and??????
Any one suggest??
Ihave 4 poss answers but cant find the reg.
Cheers |
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AlanE
Moderator
Joined: 29 Jun 2003
Posts: 1295
Location: Colchester Essex
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| Posted: Fri Jul 11, 2008 12:16 pm Post subject: |
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Could it be 'Isolation' or 'Interlock'
ie a means of preventing both power sources being connected to the system at the same time.
Vince will probably be able to quote the actual regs. |
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bobbych
Joined: 17 Mar 2006
Posts: 32
Location: NORTH EAST UK
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| Posted: Fri Jul 11, 2008 12:30 pm Post subject: |
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Cheers Alan
here are the 4 poss answers
a. Harmonic Distortion
b. High Protective Conductor Currents
c. Unbalance
d. Thermal Effects
I have been told it ay be d. but be good to see it in black and white. I know its an odd situation but its ion the mock test i have.
Cheers Craig |
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vince knight
Moderator
Joined: 04 Mar 2004
Posts: 1308
Location: Essex/East London
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| Posted: Fri Jul 11, 2008 10:17 pm Post subject: |
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Thermal effects
Reg 551.1.7 in the 17th red book 
Vince |
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