Floor box for access floors

A box to be mounted in an opening in an access or raised floor. The top of the box has flanges which engage the floor and support the box in the floor opening. The width of the box is the same as the width of the opening in the floor. The length of the box is greater than the length of the opening. The box has a curved front so that it can be swung down into the opening and when in position part of the box is under the floor. The part of the box under the floor is provided with barriers which form high and low tension channels. The box has a cover providing access to the inside of the box. The inside of the box has a plurality of plates which support high tension receptacles and low tension jacks. Also, in one embodiment, the box has a pass-thru channel for passing and/or splicing cable.

BACKGROUND OF THE INVENTION 
This invention relates to electrical distribution systems for buildings and 
in particular relates to an electrical distribution system used below a 
building floor commonly referred to as an access floor, a raised floor, a 
false floor, a computer room floor, and the like. 
More specifically, the invention relates to a floor box to be mounted in a 
precut opening in a panel of an access floor to convey communications and 
data cables to a work station on the floor surface, and to provide 
recessed power receptacles to receive plugs from the work station. 
At the present time there are, in general, two methods of installing access 
floor boxes. 
In one method, the box is supplied in two parts, one part being the box 
housing and the other part being the cover. The floor panel is removed, an 
access hole cut in same, and the housing fastened to the underside of the 
panel in alignment with the opening. The panel is replaced and the cover 
installed. The advantage of this type of arrangement is that the sections 
holding the power receptacles and the communication/data cables can be 
off-set laterally from the panel opening and, thus, increase the inside 
work area. Moreover, the size of the access opening in the panel can be 
kept to a minimum and, thus, not impair the structural integrity of the 
frame. The disadvantage is that the panel must be removed for installation 
and there is the additional step of installing the cover. In the other 
method, the box housing has the same cross sectional area as the opening 
in the floor panel. The receptacles and communication/data cable entry 
means are located right under the opening in the floor panel. The 
disadvantage of this is that the inside work area is reduced. Another 
disadvantage is that the access hole must be large and the structural 
integrity of the floor panel is weakened. One advantage is that the floor 
panel opening can be cut without removing the panel and another advantage 
is that the box housing can be inserted into the opening with the cover in 
place. 
The structure of the floor box of the present invention combines the 
principal advantage of both methods. The box housing and cover are 
assembled as a unit and inserted into a panel opening cut from the top. 
The access hole is of minimum size and has little if any effect on the 
structural integrity of the floor panel. The sections holding the power 
receptacles and communication/data entry means are laterally offset from 
the panel opening and this increases the inside work area. 
The box cover has an opening for passing power, communication, and data 
cables. For closing off the opening when the floor box is not in use and 
for conditioning the opening to pass cables, the invention provides a wire 
retainer which can be mounted on the cover frame in one way to close off 
the opening and in another way to free the opening to pass cables. 
The floor box has unique structures for accomplishing the foregoing and 
this will be apparent from the description below taken in connection with 
the following drawings wherein:

DETAILED DESCRIPTION OF THE INVENTION 
As depicted in FIG. 1, the panel of the access floor is indicated at P and 
an access opening O receives the floor box FB. 
The floor box FB has the housing 1 and the structure of the housing will be 
explained with particular reference to FIGS. 1, 3, and 4. The housing 1 
has a front wall 2 having a top edge 3 and a bottom edge 4. The top edge 3 
has an outwardly extending flange 5. A flat back wall 6 has a top edge 7 
and a bottom edge 8. The housing also has a pair of flat, parallel side 
walls 10 and 11. 
Each of the side walls 10 and 11 have upper and lower sections. For 
example, the side wall 10 has lower section 12 and upper section 13. As 
noted, the lower section 12 extends outwardly from the bottom edge 8 of 
the back wall 6. The side wall 11 is similarly constructed having upper 
section 14 and lower section 15. The lower sections 12 and 15 have top 
edges 16 and 17. 
The upper section 13 terminates in a top edge which has an outwardly 
extending flange 20 and the upper section 14 terminates in a top edge 
which has an outwardly extending flange 21. The flanges 5, 20, and 21 are 
coplanar. The purpose of these flanges is to engage the edges of the 
opening O and thereby mount the floor box FB on the access floor panel P 
as will be evident from FIG. 1. 
A flat back foot 22 is connected to the bottom edge 8 of the back wall 6 
and extends outwardly and is connected respectively adjacent but just 
below top edges 16 and 17 of the lower extensions of the side walls as 
best seen in FIG. 4. 
It will be observed that the front wall 2 arcuately converges from the top 
edge 3 downwardly to the bottom edge 4. From the foregoing, it will be 
evident that the front 2, back 6, and side walls 10 and 11 form a 
generally rectangular shaped chamber with the respective top edges forming 
an opening bordered in part by the flanges 5, 20, and 21. 
With particular reference to FIG. 4 and FIG. 1, it will be seen that a pair 
of spaced apart barriers 23 and 24 extend inwardly and are parallel to the 
side walls 10 and 11. On the top, the barriers are joined to the back foot 
22 and extend inwardly to the bottom edge 8. On the bottom the barriers 
are coplanar with the bottom of the side walls 10 and 11 and extend 
inwardly and are joined with the bottom edge 4. 
The space between the barrier 23 and 24 forms a power channel 25. The space 
between the side wall 10 and barrier 24 forms a communication and/or data 
channel 26 and the space between the barrier 23 and side wall 11 forms a 
communication and/or data channel 27. 
At opposite ends of the front wall 2 are formed exterior pockets 28 and 29. 
The tops 30 and 31 of the pockets lie within the chamber and have 
clearance holes to receive locking tab screws 32 and 33. These screws 
extend down into the pockets 28 and 29 and have locking tabs 34 and 35. 
The purpose of the locking tabs is to fit up under the panel P (FIG. 1 ) 
and secure the housing in position. Referring to FIG. 1, it will be seen 
that a top support 36 is positioned adjacent the bottom edge 8 of the back 
wall 6 and is coextensive with the bottom edge 8. A bottom support 37 is 
positioned adjacent the bottom edge 4 of the front wall 2 and is 
coextensive with the bottom edge 4. 
The supports 36 and 37 mount the electrical plates 40 and 42. The plates 40 
and 42 are communication/data plates and are secured by screws 43 threaded 
into the top support 36 and lower support 37. The plate 41 is a receptacle 
cover plate which is secured to receptacles 43 by screws 44, the tabs of 
the receptacles being connected to the top and lower supports 36 and 37 by 
screws 45. 
It will be noted that the plates 40, 41, and 42 are oriented at an angle so 
that direct contact with the screws through the opening in the chamber is 
difficult. Thus, I have provided apertures 46 in front wall 2. The shank 
of a screw driver (see FIG. 3) can be inserted through these apertures so 
the head can contact the screws. 
The power channel 25 is provided with a cover 50 and the communication/data 
channels 26 and 27 are provided with covers 51 and 52. The covers 51 and 
52 are extensions of the back wall 6. The top edge and the bottom edge of 
each cover has half moon clearance holes such as the holes 53 and 54 for 
the cover 51. These half moon holes receive screws (FIG. 1) such as the 
screws 55 threaded in the back foot 22 and the screw 56 threaded into the 
boss 57 adjacent the bottom edge 4 of the front wall. There are two 
additional bosses like the boss 57 for the screws for covers 51 and 52. 
The cover 50 for the power channel has openings 60 which receive wire 
connectors such as the wire connector 61. These wire connectors or 
receptacles are of the type shown in copending application of R.D. 
Benscoter et al Ser. No. 480,470 now U.S. Pat. No. 4,857,016. The wire 
connector is adapted to receive a cable head 62 also of the type shown in 
application Ser. No. 480,470 now U.S. Pat. No. 4,857,016. The receptacle 
43 is electrically connected to the wire connector 61 by conductors 63. 
The communication/data covers 51 and 52 have knockouts to receive grommets 
for passing the communication/data cables. For example, see knockout 64 
and grommet 65 for cover 51. 
The floor box cover and frame assembly will now be described, but first I 
will refer to means in the housing 1 to secure the assembly in place. Back 
wall 6 has a plurality of slots 66 which are respectively adapted to 
receive a keeper finger. The tops of pockets 28 and 29 are formed with 
slots 67 and 68 which receive headed snap fingers. The heads engage the 
underside of the tops 30 and 31. 
The cover frame is indicated at 70 and is rectangular in shape so as to fit 
into the opening to the housing. The frame has a front wall 71, rear wall 
72, and side walls one of which is shown at 73. The tops of the foregoing 
side walls are coplanar and form a frame top and extending outwardly 
therefrom are flanges indicated at 74, 75, 76, and 77 which are also 
coplanar. On the lower part of each of the side walls is an inwardly 
extending cover support flange, the front and rear cover support flanges 
being indicated at 80 and 81 and the cover support flange on side wall 73 
being indicated at 82. The side walls and support flanges form a recessed 
area to receive a cover as noted later. 
On the underside of front support flange 80 there are a pair of snap 
latches one of which is indicated at 83 in FIG. 1. These snap latches are 
received in the slots 67 and 68 in the housing with each head of the latch 
engaging the underside of the tops 30 and 31. 
The bottom of the rear wall 72 of the frame 70 has three horizontally 
extending fingers such as the finger 84 shown in FIG. 1. The fingers are 
received in slots 66 in the back wall 6. 
It will be evident that with the rear fingers 84 in the slots 66 and the 
front latches (83) engaged with the housing, the cover frame 70 is held in 
position. It also will be apparent that with the foregoing arrangement, 
the cover frame can be quickly connected to the housing. 
The side walls of the cover frame adjacent the rear wall 72 are formed with 
U-shaped pivot carriers 85 and 86. The pivot carriers are arranged to 
receive pivot shafts on the cover as will be commented on later. 
Additionally, the front flange 80 is formed with a slot 87 to provide room 
for a latch finger on the cover to move into position as will be noted 
later. The front flange 80 is formed with an opening 90 (FIG. 5). At each 
end of the opening 90 is a vertically extending dovetail keyway as 
indicated at 91 and 92. These keyways face one another and are parallel. 
As noted for the keyway 91, the keyway is closed at the bottom and open at 
top. These keyways are adapted to receive keys in a wire retainer which 
will be explained shortly. 
The cover or cover frame 93 is rectangular in shape and includes four side 
walls, the front and back being indicated at 94 and 95 and the walls 
interconnecting same are indicated at 96 and 97. The top peripheral edges 
of the four side walls are coplanar and form a top cover edge 98. The 
opposite ends of the back wall 95 carry short pivot shafts which are 
adapted to fit into pivot carriers 85 and 86 in the cover frame 70. One of 
the pivot shafts is indicated at 100 in FIG. 2. The pivot shafts being 
rotatably mounted in the pivot carriers permit the cover to rotate between 
the closed position of FIG. 1 to any of the open positions as indicated in 
FIG. 2. 
The pivot carriers and the pivot shafts are dimensioned so that the shafts 
can be snapped in and pulled out. The pivot carriers have a lower 
180.degree. curvature which corresponds to the diameter of the pivot shaft 
and at the extreme ends of the carrier instead of terminating the 
material, the same is slightly continued in the circle so that the space 
is slightly less than the diameter of the pivot shaft. When a shaft is 
pressed into a carrier, the same separates and allows the shaft to move 
fully into position. When the cover is to be pulled out, the carriers 
expand and permit exit of the pivot shafts. The cover or cover frame 93 
includes central support section 101 which is joined to the bottoms of the 
front, back, and side walls and extends downwardly therefrom and is spaced 
inwardly from the top peripheral edges of the walls to form a carpet 
cavity 102 which carries carpet 103. The central support section 101 is 
formed as by a plurality of downwardly extending interconnected flanges 
104 which create a strengthening grid. 
The front side 94 of the cover has a finger 105 which when the cover is 
moved to the closed position is cammed inwardly by the slot 87 and when 
the finger passes the slot it snaps under the flange 80 of the frame to 
lock the cover in position. A pry-up slot 106 on the cover can receive the 
end of a screw driver by which the cover can be pryed loose. 
The cover frame 70 and the cover 93 individually and in combination provide 
support means for foot, equipment, or wheeled traffic. 
The front wall 94 of the cover also is formed with an opening 107 which, 
when the cover is in the closed position, is in vertical alignment with 
the opening 90 in the cover frame. The opening 107 can be put in an open 
or a closed condition by the action of a wire retainer as will now be 
explained. The shape of the wire retainer is shown in FIGS. 6, 7, and 8. 
The wire retainer 110 has an elongated body 111 with a continuous planar 
top surface 112, a pair of side sections 113 and 114 extend outwardly of 
the body 111 and form a space 115 therebetween. This space 115 has 
approximately the same cross sectional area as the opening 90 in the frame 
and the opening 107 in the cover. The body has wide platform section 116 
normal to the top 112 and a narrow platform section 117 normal to the 
platform section 116. The platform section 117 is also joined to the side 
sections 113 and 114. 
The side sections 113 and 114 carry heads 120 and 121. Each head is 
configured so that in a direction normal to the top 112 (FIG. 7) the 
blocking dovetail keys 122 and 123 are formed. In the direction normal to 
the platform section 116 (FIG. 8) the opening dovetail keys 124 and 125 
are formed. As will be apparent, the blocking keys 122 and 123 are at 
90.degree. to the opening keys 124 and 125. 
If the wire retainer 110 as shown in FIG. 6 is placed over the opening 90 
in the frame, and then rotated (into the paper) 90.degree. about the axis 
of the body, and then is rotated in azimuth 180.degree., the head 121 will 
be over the keyway 91 and the head 120 will be over the keyway 92. The 
opening keys 123 and 122 will be ready to slide respectively in keyway 92 
and keyway 91. If the wire retainer 110 is then moved down so the keys 
slide in the keyways, the retainers will be in the position as shown in 
FIG. 4. The wide platform 116 is in a position to be engaged with the 
cover. The opening 115 will be aligned with the opening 107 in the cover. 
This allows the passage of cables as shown. 
When the floor lap is not in use and the opening 107 in the cover is to be 
blocked off, the wire retainer 110 is removed from the opening and 
manipulated so that it assumes the position of FIG. 6 and moved over the 
opening 90 in the frame. The head 120 will be over the keyway 91 and the 
head 121 will be over the keyway 92 with the blocking keys 122 and 123 
ready to slide in the keyways. If the wire retainer 110 is then moved down 
so the keys slide in the keyways, the wire retainer 110 will have assumed 
the position shown in FIG. 9. It will be seen that the opening 90 in the 
cover frame is closed and the opening 107 in the cover is also closed. The 
top 112 is flush with the front flange 74 of the frame and with the front 
peripheral edge of the cover. 
The manner of installing the floor box in the access floor will now be 
described. 
One of the advantages of the floor box is that it can be assembled above 
the floor with the cover, power wiring, and necessary communication/data 
grommets in place so that the access hole in the floor panel can be cut 
from the top. The power conductor with cable heads are brought out through 
the opening and plugged into the receptacles in the box. Likewise, the 
communication/data cables are brought out and threaded through the 
grommets in the floor box and then brought out through the open cover. 
The floor box is tilted with the back side down and slipped into the 
opening O. (See FIG. 10) As the box is moved inwardly, it is rotated so 
the rear section fits underneath the floor panel. The cables are pushed 
inwardly as the box is moved. The arcuate arrangement of the front wall 2 
permits this motion. When the box is fully in position, the flanges will 
engage the panel and then the screws 32 and 33 can be turned to bring the 
locking tabs 34 and 35 against the underside of the panel and lock the box 
in position. The cables from the work station are brought into the box and 
plugged into the receptacles. The communication/data cables for the work 
station are also set up. All of the cables are then placed in the frame 
opening 90 and the wire retainer 110 dropped into the keyways in the 
position shown in FIG. 4. The cables are now held in position. The cover 
is closed and the operation is completed. 
In FIGS. 11-20 I have shown the previously described floor box modified in 
a way to gain important advantages. 
One important advantage is the increase in capacity of the box particularly 
with respect to the mix of power and telephone and data access facilities 
in the box. 
The wire retainer or management block has special utility in the box 
because the nature of the block is conducive to handling the increased 
number of cables without difficulty. 
Another advantage is that the modified box employs a pass-thru channel 
which permits cable to pass through the channel or to be spliced. For 
example, a 24 pair telephone cable may be spliced with 4 pair entering the 
box and the remainder passing through the box to another station. The 
housing 120a has a front wall 121a having a top edge 122a and a bottom 
edge 123a. The top edge 122a has an outwardly extending flange 124a. A 
flat back wall 125a has a top edge 126 and a bottom edge 127. The housing 
also has a pair of flat, parallel side walls 130 and 131. 
It will be observed that the front wall is comprised of a top portion 132 
and a lower portion 133. The top portion 132 terminates at the top edge 
122a and the lower portion 133 terminates at the bottom edge 123a. The top 
portion 132 arcuately converges from the top edge 122a in a direction 
toward the bottom edge 123a. The lower portion 133 has a special 
configuration as will be presently described. The upper portion 132 and 
lower portion 133 join at 134. 
The side walls 130 and 131 have upper and lower sections. The side wall 130 
has lower section 135 and upper section 136. The side wall 131 is 
similarly constructed having (FIG. 14) upper section 140 and lower section 
141. As noted, the lower sections 135 and 141 extend outwardly from the 
bottom edge 127 of the back wall 125a and include top edges 142 and 143. 
The upper section 136 of side wall 130 has an outwardly extending flange 
144 and the upper section 140 of side wall 131 has an outwardly extending 
flange 145. The flanges 123a, 144, and 145 are coplanar. The purpose of 
these flanges is to engage the edges of the opening and thereby mount the 
floor box on the access floor panel similar to the floor box previously 
described. A flat back foot 146 is connected to the bottom edge 127 of the 
back wall 125a and extends outwardly just below top edges 142 and 143. 
From the foregoing, it will be evident that the front 121a, back 125a, and 
side walls 130 and 131 form a generally rectangular-shaped chamber with 
the respective top edges forming an opening bordered in part by the 
flanges 124a, 144, and 145. 
A pair of spaced apart barriers 150 and 151 are parallel to the side walls 
130 and 131. On the top, the barriers are joined to the back foot 146 and 
extend inwardly to the bottom edge 123a. 
The space between the barriers 150 and 151 forms a power channel 152. The 
space between the side wall 130 and barrier 151 forms a communication 
and/or data channel 153 and the space between the barrier 150 and side 
wall 131 forms a communication and/or data channel 154. 
Exterior pockets 155 and 156 are respectively formed on said walls 130 and 
131. The tops of the pockets 155 and 156 lie within the chamber and have 
clearance holes to receive locking tab screws such as screw 157 of pocket 
156. The screw 157 carries locking tab 158. The locking tabs serve the 
same purposes as tabs 34 and 35. Referring to FIGS. 11 and 12, it will be 
seen that a top support means 160 is positioned adjacent the bottom edge 
127 of the back wall 125a and extends between side walls 130 and 131. A 
bottom support means 161 is positioned adjacent the bottom edge 123a of 
the front wall 121a and also extends between side walls 130 and 131. The 
supports 160 and 161 have means to mount the electrical plates which, like 
the plates 40, 41, and 42, are set up for power, communication, and data. 
The power channel 152 and the communication/data channels 153 and 154 are 
provided with covers (similar to 51 and 52) to receive wire connectors and 
grommets. Like the covers 51 and 52, the cover for channels 152-154 when 
in place form part of the back wall of the floor box. 
The floor box cover and frame assembly will now be described, but first I 
will refer to means in the housing 120a to secure the assembly in place. 
Back wall 125a has a pluraity of finger keeper slots 162 which are 
respectively adapted to receive a keeper finger. The top portion 132 of 
front wall 121a has a pair of pockets 163 and 164, the tops of which are 
formed with latch finger slots 165 and 166 which respectively receive 
headed snap fingers with the heads engaging the underside of the tops of 
the pockets. 
Referring to FIGS. 15 and 16, the cover frame is indicated at 170 and is 
rectangular in shape so as to fit into the opening to the housing 120a. 
The frame has a front wall 171, rear wall 172, and side walls 173 and 174. 
On the tops of the foregoing frame walls are outwardly extending flanges 
indicated at 175, 176, 177, and 178 which are coplanar. On the lower part 
of each of the frame walls is an inwardly extending cover support flange, 
the front and rear cover support flanges being indicated at 180 and 181 
and the cover support flange on side walls being indicated at 182 and 183. 
The frame walls and support flanges form a recessed area to receive a lid 
or cover as noted later. 
On the underside of front support flange 180 there are a pair of snap 
latches one of which is indicated at 184 in FIG. 16. These snap latches 
are received in the slots 165 and 166 in the housing. 
The bottom of the rear wall 172 of the frame carries three horizontally 
extending fingers such as the finger 185 shown in FIG. 16. The fingers are 
received in slots 162 in the back wall 125. 
It will be evident that with the fingers 185 in the slots 162 and the front 
latches 184 engaged with the housing, the cover frame is held in position. 
It also will be apparent that with the foregoing arrangement, the cover 
frame can be quickly connected to the housing. The side walls 173 and 174 
of the cover frame in position adjacent the rear wall 172 are formed with 
U-shaped pivot carriers 186 and 187. The pivot carriers are arranged to 
receive pivot shafts on the cover as will be commented on later. 
Additionally, the front flange 180 is formed with slots 190 to provide 
room for a latch finger on the cover to move into a cover locking position 
as will be noted later. 
The embodiment of the box in FIGS. 11-20 has means for securing wire 
retainers or wire management blocks both on the front and on the sides. 
This will now be described. 
The front flange 180 is formed with an opening 191. At each end of the 
opening 191 is a vertically extending dovetail keyway as indicated at 
191a. The keyways face one another and are parallel. Each keyway is closed 
at the bottom and open at the top. The support flanges 182 and 183 have 
similar openings and keyways 192/192a and 193/193a. 
In FIGS. 17 and 18 I have shown a cover to be mounted in frame 170 and 
which is adapted for use on a floor with carpeting. 
The cover 195 is rectangular in shape and includes four side walls, the 
front and rear being indicated at 196 and 197 and the walls 
interconnecting same are indicated at 198 and 199. The top peripheral 
edges of the four side walls are coplanar. The opposite ends of the rear 
wall 197 carry short pivot shafts 200 and 201 which are adapted to fit 
into pivot carriers 186 and 187 in the cover frame 170. The pivot shafts 
being rotatably mounted in the pivot carriers permit the cover to rotate 
between the closed and open positions. 
Similar to the pivot carriers and the pivot shafts previously described, 
the carriers 186-187 and shafts 200-201 are dimensioned so that the shafts 
can be snapped in and pulled out. 
The cover 195 includes central support section 202 which is joined to the 
bottoms of the front, back, and side walls and extends downwardly 
therefrom and is spaced inwardly from the top peripheral edges of the 
walls to form a cavity 203 for carpet. The central support section 202 is 
formed as by a plurality of downwardly extending interconnected flanges 
204 which create a strengthening grid. 
The front side 196 of the cover has a pair of latch fingers one of which is 
indicated at 205. When the cover is moved to the closed position, the 
fingers are cammed into slots 190 and snap under the flange 180. Pry-up 
slots 206 on the cover can receive the end of a screw driver by which the 
cover can be pryed loose. 
The front wall 196 and the side walls 198 and 199 of the cover also are 
formed with openings 207, 208, and 209 which match openings in the cover 
frame for receiving part of the wire retainers or wire management blocks. 
Typical structure and the operation and function of the wire retainers or 
wire management blocks have been previously described and the same will 
not be repeated here. 
In FIGS. 19 and 20 I have illustrated a cover or lid for use with the cover 
frame 170 of FIGS. 15 and 16 and which is adapted for use on a floor have 
a tile covering. 
The cover 210 is rectangular in shape and has front wall 211, rear wall 
212, and side walls 213 and 214. A flat top plate 215 extends between the 
walls. When the cover is mounted in the frame 170, the surface of the 
plate 215 is flush with flanges 175-178. The side walls 213 and 214 carry 
snap fingers 216 and 217 which, when the cover is in closed position, snap 
under the flanges 182 and 183. The front wall has pry-up slots 218. Pivot 
shafts 220 and 221 are disposed at the opposite ends of rear wall 212. The 
central support section 222 extends down from plate 215 and comprises a 
plurality of vertical flanges 223. The front and side walls are provided 
with openings 224, 225, and 226 for receiving wire retainers or wire 
management blocks. 
Referring back to FIGS. 11 and 12, the lower section 133 of the box will be 
described. The lower section 133 includes a front plate 230, a back plate 
231, and a mounting plate 232. The plates 230 and 231 extend between side 
walls 130 and 131 and are spaced apart to form a channel 233 open at the 
top to the chamber and open at the bottom to the exterior of the box. 
As noted, mounting plate 232 extends between the bottom edge 123 and the 
back plate 231 and carries a plurality of knockouts 234 for connecting 
such connectors for coax cable. The mounting plate 232 has clearance 
and/or threaded holes 235 for connecting one or more electrical plates. 
The front plate 230 also has clearance and/or threaded holes 236 for 
securing (in cooperation with holes 235) electrical plates and/or one or 
more covers. 
The top of the plates 230 and 231 have threaded holes 237 and 238 for 
mounting electrical plates for either high or low tension connectors. When 
power receptacles are employed, a plate, for isolation purposes, has legs 
or barriers which extend down into the chamber to engage a plate. 
The side walls 130 and 131 are cut away at opposite ends of the channel. 
The cutaway in wall 130 is noted at 240 and the cutaway in side wall 131 
is indicated at 241. The channel permits a cable to pass through the box 
or to be spliced with a connector in the channel. 
Before closing it is to be mentioned that the box of FIGS. 14-20 is 
installed in the opening in an access floor in the same way as previously 
described for the box of FIGS. 1-10.