Help in MASS.......

[Jeter]

Does anyone have the anwser to this MASS question? a service disconnet may not be further than how many feet????

25
15
12
10

I can not find a footage in the book, it just states to put it in plan site. so that would be 10 feet, right????

 

[JWCELECTRIC]

Does anyone have the anwser to this MASS question? a service disconnet may not be further than how many feet????

25
15
12
10

I can not find a footage in the book, it just states to put it in plan site. so that would be 10 feet, right????

None of the above, Seen them all distances

 

[tryinghard]

230.70(A)"...readily accessible location...nearest the point of entrance of the service conductors." No footage. The fuses on the utilities XFMR protect overcurrent but the short circuit ground fault protection comes from the service disconnect, this is why it needs to be nearest point of the service entrenc conductors.

 

[JAMAN]

Does anyone have the anwser to this MASS question? a service disconnet may not be further than how many feet????

25
15
12
10

I can not find a footage in the book, it just states to put it in plan site. so that would be 10 feet, right????

The answer is 10 feet. You can find it in the Mass Electrical Code (527 CMR 12).

 

[Twoskinsoneman]

230.70(A)"...readily accessible location...nearest the point of entrance of the service conductors." No footage. The fuses on the utilities XFMR protect overcurrent but the short circuit ground fault protection comes from the service disconnect, this is why it needs to be nearest point of the service entrenc conductors.

Don't you have that backwards. The transformer would protect short circuit and ground fault and the service OCPD would protect overloads.... both being overcurrent conditions.

 

[iwire]

The answer is 10 feet. You can find it in the Mass Electrical Code (527 CMR 12).

The 10' of which you speak is the maxiumum distance away from the building you can mount the service disconnect when it is outside. The distance inside is the same as the NEC nearest to the point on entrance.

 

[iwire]

The fuses on the utilities XFMR protect overcurrent but the short circuit ground fault protection comes from the service disconnect,

Don't you have that backwards. The transformer would protect short circuit and ground fault and the service OCPD would protect overloads.... both being overcurrent conditions.

The fuses on the primary side of the utility transformer do absolutely nothing to protect the secondary side conductors ........... nothing at all.

The fuse on the primary side keep a shorted transformer from bring down the primary feeders. The fuses on the primary side are sized much larger then the NEC would ever allow.

 

[Twoskinsoneman]

The fuses on the primary side of the utility transformer do absolutely nothing to protect the secondary side conductors ........... nothing at all.

The fuse on the primary side keep a shorted transformer from bring down the primary feeders. The fuses on the primary side are sized much larger then the NEC would every allow.

Yes of course you are right. Unless there was like a fuse for each transformer how would they be able to size the fuses to do anything about a short on the secondary?

Service conductors are not protected against shorts.