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5% rule. #178705
06/09/08 09:17 PM
06/09/08 09:17 PM
S
Sandro  Offline OP
Member
Joined: Dec 2001
Posts: 444
Stoney Creek, ON, Canada
300 mcm T90Nylon is rated for 295amps. Using the 5% rule, one could use parallel 300mcm runs for a 600 amp service?

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Re: 5% rule. [Re: Sandro] #178706
06/09/08 10:22 PM
06/09/08 10:22 PM
T
twh  Offline
Member
Joined: Mar 2004
Posts: 926
Regina, Sask.
If your calculated demand is 620 amps, you can put in a 590 amp service, which would be fused at 600 amps according to 14-104, if a 590 amp fuse is not available. That is, you can install a 590 amp service and fuse it at 600 amps.

Re: 5% rule. [Re: twh] #178920
06/15/08 09:32 PM
06/15/08 09:32 PM
T
ThorahSparky  Offline
Junior Member
Joined: Apr 2003
Posts: 13
Orillia,ON,Canada
Generally if you are considering applying the 5% rule I would first run it by your local inspector. Yes, it is a rule but doing so makes for a better relationship, especially if you don't know him/her.


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