Electrical junction boxes are required for all wall plugs.
													
																	Large junction box size. 
									
	
		
	
																	Depending on what sized wire how many wires are in a given box and the number of wire splices in that box you may need a little more room than a standard box can give you. 
																	Plus one universal electrical wall box 1 gang 10 cu. 
																	Installing a junction box that is too small is illegal and unsafe. 
																	Use 314 28 a to size pull boxes junction boxes and conduit bodies when using conductor sizes 4 awg and larger. 
															
													
									
	
		
	
																	Suppose you have a 2 inch raceway coming into a 10 inch square box and a 2 inch raceway leaves it on the opposite side. 
																	Hfasg24x24x12nk pull box screw cover bulletin a90p1 pull boxes type1 size dims. 
																	Hfa1212chnfss j box type 4x hinged cover bulletin a51s stainless steel junction boxes size dims. 
																	Old work electrical box 1 2 3 4 gang. 
															
													
									
	
		
	
																	A box containing only straight pulls that is calculated by the straight pull method could be too small if there are spliced conductors in the junction box. 
																	Typical 4 inch electrical boxes used for single or more often duplex electrical receptacles. 
																	Below left we show a typical 4 inch metal junction box and below right a common and deeper plastic junction box.