RISER FEEDER SPLICES

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mstrlucky74

Senior Member
Location
NJ
What determines when you splice large feeders in a vertical riser. Is it to help pulling? Is it every couple hundred feet? Most large wire comes in 1000' reels so obviously if the vertical length is over 1000' your gonna need to splice although that's a pretty damn high building. THanks
 

John120/240

Senior Member
Location
Olathe, Kansas
What the engineer specifies or job site conditions. Whatever you do we can not support wire by the terminations alone.. You would need a Chinese finger type device or similar for support.
 

infinity

Moderator
Staff member
Location
New Jersey
Occupation
Journeyman Electrician
What determines when you splice large feeders in a vertical riser. Is it to help pulling? Is it every couple hundred feet? Most large wire comes in 1000' reels so obviously if the vertical length is over 1000' your gonna need to splice although that's a pretty damn high building. THanks

Many times it just easier and cheaper to splice then it is to attempt to pull the entire run in at one time. Also with large conductors if you have a number of bends in the run pulling out of one pull point and re-feeding the conductors back in can be more trouble then it's worth. Making multiple pulls with splices can be faster/easier.
 

Fulthrotl

~Autocorrect is My Worst Enema.~
What the engineer specifies or job site conditions. Whatever you do we can not support wire by the terminations alone.. You would need a Chinese finger type device or similar for support.

and wire chocks every 100' is pretty typical.

i haven't seen a high rise in a very long time done with
anything other than bus duct. the problem is, that with
high buildings, you'd have multiple risers feeding a few
floors and dropping off, so as you got closer to the
source panel, you'd have more and more 4" feeders
clogging up the riser area... you can put an awful lot of
amps in a space needed for four 4" conduits if you use
bus duct.
 

mstrlucky74

Senior Member
Location
NJ
and wire chocks every 100' is pretty typical.

i haven't seen a high rise in a very long time done with
anything other than bus duct. the problem is, that with
high buildings, you'd have multiple risers feeding a few
floors and dropping off, so as you got closer to the
source panel, you'd have more and more 4" feeders
clogging up the riser area... you can put an awful lot of
amps in a space needed for four 4" conduits if you use
bus duct.



True indeed.
 

mstrlucky74

Senior Member
Location
NJ
and wire chocks every 100' is pretty typical.

i haven't seen a high rise in a very long time done with
anything other than bus duct. the problem is, that with
high buildings, you'd have multiple risers feeding a few
floors and dropping off, so as you got closer to the
source panel, you'd have more and more 4" feeders
clogging up the riser area... you can put an awful lot of
amps in a space needed for four 4" conduits if you use
bus duct.


Hey Fulthrotl.....what are the most common splices(brand/type) you use for feeders?
 

Fulthrotl

~Autocorrect is My Worst Enema.~
Hey Fulthrotl.....what are the most common splices(brand/type) you use for feeders?

burndy hypress.

butt splices, one and two bolt hole lugs, and finger lugs.

best insulation for splices i've seen is 3M cold shrink.
also the most expensive. prohibitively so. 250 mcm
is $34 a splice. fast.

next in line is panduit self vulcanizing heat shrink tube.
UL listed for 600 volts, direct burial.
the stuff for 350~500 mcm is about $11 a foot.
slow.

then there is scotchfill, and 33+.
what the rest of us use.
 

mstrlucky74

Senior Member
Location
NJ
burndy hypress.

butt splices, one and two bolt hole lugs, and finger lugs.

best insulation for splices i've seen is 3M cold shrink.
also the most expensive. prohibitively so. 250 mcm
is $34 a splice. fast.

next in line is panduit self vulcanizing heat shrink tube.
UL listed for 600 volts, direct burial.
the stuff for 350~500 mcm is about $11 a foot.
slow.

then there is scotchfill, and 33+.
what the rest of us use.

Thanks...just what I was looking for.
 
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