TRANSFORMER-PANEL INSTALL

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puckman

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ridgewood, n.j.
I did a transformer/ panel install and like to know if i missed anything with the grounding and bonding .

1. primary side is 480 volt in alum ridget conduit with a egc from ground bar in motor control center to the lug attached to the transformer case.
2. secondary is 208/120 the XO in trans is conected to the neutral bar of my panel , with a jumber from XO to the transformer case.
3. from trans case to ground bar attached inside panel.
4. from i beam inside building attached to transformer case.
5. using sealtite from trans to panel.

If i missed something please let me know . thanks for the help.
 
puckman said:
I did a transformer/ panel install and like to know if i missed anything with the grounding and bonding .

1. primary side is 480 volt in alum ridget conduit with a egc from ground bar in motor control center to the lug attached to the transformer case.
2. secondary is 208/120 the XO in trans is conected to the neutral bar of my panel , with a jumber from XO to the transformer case.
3. from trans case to ground bar attached inside panel.
4. from i beam inside building attached to transformer case.
5. using sealtite from trans to panel.

If i missed something please let me know . thanks for the help.
Click to expand...

What size is the sealtite? Does it contain an EGC?
 
puckman said:
1.5 sealtite ul . I thought wire from ground bar in panel to XO in trans which is attached to transformer case served as a egc on secondary side ?
Click to expand...

That's why I asked. With 1.5" LFMC you would need a wire type conductor sized according to 250.66 run with the secondary conductors to the panel.

250.118 Types of Equipment Grounding Conductors.
(6) Listed liquidtight flexible metal conduit meeting all the following conditions:
a. The conduit is terminated in listed fittings.
b. For metric designators 12 through 16 (trade sizes through ?), the circuit conductors contained in the conduit are protected by overcurrent devices rated at 20 amperes or less.
c. For metric designators 21 through 35 (trade sizes ? through 1?), the circuit conductors contained in the conduit are protected by overcurrent devices rated not more than 60 amperes and there is no flexible metal conduit, flexible metallic tubing, or liquidtight flexible metal conduit in trade sizes metric designators 12 through 16 (trade sizes through ?) in the grounding path.
d. The combined length of flexible metal conduit and flexible metallic tubing and liquidtight flexible metal conduit in the same ground return path does not exceed 1.8 m (6 ft).
e. Where used to connect equipment where flexibility is necessary after installation, an equipment grounding conductor shall be installed.
Click to expand...
 
I believe i have that wire listed in op on line 3. A wire [1.5 }from transformer to panel ground bar i though served that purpose ? But i am not sure?

Thanks for the help with this to all.
 
puckman said:
I believe i have that wire listed in op on line 3. A wire [1.5 }from transformer to panel ground bar i though served that purpose ? But i am not sure?

Thanks for the help with this to all.
Click to expand...

OK now I see it, it didn't mention a conductor so I wasn't sure what #3 meant. :)

So in your 1.5" LFMC you have the secondary conductors and a supply side bonding jumper going to the panel. What size are the secondary conductors and what size is that supply side bonding jumper conductor?
 
I have #2 secondary conductors with a # 2 from xo to a transformer case lug.
my supply conductors are # 6 with a #6 egc to transformer case lug.

Thanks again.
 
puckman said:
I have #2 secondary conductors with a # 2 from xo to a transformer case lug.
my supply conductors are # 6 with a #6 egc to transformer case lug.

Thanks again.
Click to expand...

So you have 5-#2 AWG conductors in the 1.5" LFMC?
 
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